text stringlengths 83 79.5k |
|---|
H: Low ESR capacitor: what does it mean/how to select one?
I'm trying to design a PCB including a TPS5450 step down converter.
For the boost capacitor, the datasheet asks for a "low ESR ceramic capacitor":
7.3.5 Boost Capacitor (BOOT) Connect a 0.01-μF, low-ESR ceramic capacitor between the BOOT pin and PH pin. This ... |
H: Is it safe to run tracks through PCB mousebites?
I have this set of PCBs. The top left board is always going to be broken away, but either the middle or the right one is there to stay. In order to save me a few millimeters and two whole 3-pin connectors on the large and one of the small boards, I thought to run a f... |
H: Check my first PCB design
attached are screenshots of my first pcb and schematic files. Please let me know if there is anything I can do to improve the design as well as if there are any fatal issues with how it is currently set up as I am learning on my own.
What the circuit is designed to do:
The pcb is meant to... |
H: Tying open-collector outputs to TTL inputs
I know that open collector outputs are effectively either 0 V or high-Z.
I also know that TTL chips tend to read a disconnected output as high, but that really you should have something like a 1 kΩ pull-up resistor for safety.
But does the warning about a pull-up resistor ... |
H: Is it possible to individually control each LED the way this schematic is designed?
I'm currently researching a design which includes the below schematic :
This is supposed to be an array of LEDs which are attached to the front panel of the device for indicator lights.
However, I am confused as these indicator lig... |
H: Finding footprints and symbols for common components
I am wanting to use a 5x2 IDC connector in my project which are quite common. Most IDC connectors such as this one don't have a footprint or symbol. Which one do I use? Can I use any 5x2 connector provided it has the correct pitch i.e 2.54 mm in this case?
AI: So... |
H: Does an LNA with a dedicated Vbias pin affect impedance matching?
I am optimizing an impedance match for an LNA in my target frequency range using a Touchstone s2p that Qorvo provides for the QPL9547 (datasheet).
The Vbias pin is separate from the RF-in pin. I'm used to biasing a FET gate on the RF input pin (assu... |
H: Build on-chip ROM in HDL
I wrote the next code in quartus 15.0, where I show what I want to do for a specific project. I can write it both in VHDL and Verilog HDL, but verilog is notoriously shorter.
module TOP(
//
);
//
ONCHIP_RAM_verilog #(
.ADDRESS_WIDTH (16),
.DATA_WIDTH (64),
.INIT_FILE ("FIS_R... |
H: How do LDMOS datasheets label current draw through the gate?
I'm trying to figure out how much current is required to bias a FET's Vgs so I can choose a DAC to set the gain. If I understand correctly, very little is required, but I couldn't find something obvious on the datasheet.
I'm looking at the NXP MRF300AN 3... |
H: Signal is garbled when driving inductive load
Background
I'm trying to make a circuit to determine rotor angle of a motor using a resolver https://en.wikipedia.org/wiki/Resolver_(electrical). This involves generating a ~5-10kHz sine wave to drive the input to a rotary transformer.
Problem
I've created the following... |
H: BLDC - Field Oriented Control
I am designing an AGV for which I am in the process of selecting a controller IC for BLDC motor. I read through design considerations document by TI and came to know that FIELD ORIENTED CONTROL will be apt as the AGV will require to output higher torque.
FOC is a new concept to me. Fro... |
H: How to perform quality assurance?
The site description is given as "Q&A for electronics and electrical engineering professionals, students, and enthusiasts" and I'm interested in "QA for electronics". Though I guess QA is not explicitly engineering but it's also not reverse engineering. Maybe something in between?
... |
H: Sigma-Delta differential ADC for PT100 without precision Iexc or Vexc
We are discussing a way to precisely measure PT100 (variable resistance) using a MSP430 with 24bit sigma-delta differential ADCs without having a precision source of current or voltage.
We came up with this solution:
The way we want to do this i... |
H: Is it advisable to make communication re attempts in modbus?
In my system, I know that the approximate response time between master-slave is 10ms, if the slave does not receive communication during those 10ms then it detects an error and the motors turn off.
Is it advisable to make a few attempts (for example 3) to... |
H: ESP (ESP8266/ESP32) Mosfet switch problem
My aim is to automatically power off the ESP by turning off the pinout.
When I test the circuit I get the out voltage 1.6 V when I assume to get 3.3 V.
What I'm doing wrong?
AI: The IRF4905 is no-way suitable for such low voltage supplies. The \$V_{GS(THRESHOLD)}\$ value is... |
H: What is this metal box with BNC connectors for?
I found this box with a schematic drawn on it. What is it for?
AI: This is an attenuator with coax inputs, no input match, and an output impedance of approximately 50 ohms. Based on the coax inputs and 50-ohm output impedance, it looks like it might be designed for h... |
H: What type of capacitor (varistor?) is this?
I inherited a prototype to document, but came across this single capacitor (varistor?) on the 24VDC input (a polarized cap symbol designated as "PS1"; see schematic image) with no value. The schematic was made in DipTrace, but the symbol used seems to have been a generic ... |
H: Replacing laptop power lead with moulded connector
I have a laptop whose power supply consists of two parts: a lead with moulded BS1363 plug (3A fuse) on one end and an IEC C5 connector on the other; and a transformer which takes the C5 connector and outputs low voltage to the laptop.
I would like to replace the m... |
H: Why do power rails on breadboards omit connection points?
It seems most solderless breadboards don't have the connection points on the power rails aligned to the rest of the connection points.
Some just omit every 6th; on some the gap isn't even a multiple of 0.1 inches so some points don't line up at all.
I think ... |
H: Impact of underpowered speakers
I have an Onkyo TX-8220 Stereo Receiver and a pair of Polk Audio TSi400s.
The receiver specs:
With 8 ohm loads, both channels driver, [...] rated 45 watts per channel minimum RMS power.
The speaker specs:
Nominal Impedance: 8 ohms
Power Handling (per channel): 20 watts → 200 watts... |
H: When should you use a gate driver, and how do you choose one?
I'm building an amp using the NXP MRF300AN 300W LDMOS RF power amplifier device and was originally planning to use a DAC to drive the gate bias until @Hearth mentioned that I should use a gate driver. A quick search for "gate driver" on Mouser turned up ... |
H: USB-C Charging with TPS25740B Questions
I am using the TPS25740B(datasheet) as a usb-c PD controller. I am confused why it can only output 60W with receptacle.
From the datasheet:
Later it says:
Question 1: Does this mean current should be limited to 3A solely because the cable connected to the receptable might n... |
H: What's the purpose of non-wettable soldering iron tips?
While looking for a very fine soldering iron tip, I came across this tip. It apparently has no wettable surface like every other tip I've used does, and I struggle to see why this might be a desirable characteristic.
Has anyone ever used one of these non-wetta... |
H: Does the PFC stage adjust its output power depending on the load requirements of downstream converters?
I am trying to calculate the overall efficiency of a PFC+flyback converter. The PFC boost converter has an efficiency of 0.9 and the flyback an efficiency of 0.89. Depending on the load which requires 374 W (from... |
H: Representation of 2 and 7 in 5211 binary code
In 5211 binary code 2 is represented as 0011 and 7 is represented as 1100. My question is why can't we represent 2 as 0100 and 7 as 1011 in 5211 code?
AI: Image from here.
5211 is "reflective: -
"9" is the 1's complement of "0",
"8" is the complement of 1,
7 is the com... |
H: LM4565FV-GE2 opamp stuck high
I'm using a LM4565FV-GE2 opamp to amplify the sine signal generated by an AD9837 DDS chip, but the opamp output is stuck at around ~11.5V. I'm using a DS3502 digipot to control the gain, represented in the schematic as a pot.
simulate this circuit – Schematic created using CircuitLab
... |
H: Component ratings amps or watts?
Why are some DC components rated for maximum amps (LEDs, incandescent lamps, etc.) while other components are rated for maximum watts (resistors, speakers)?
AI: Typically, and one can only speak of typically...
Parts rated for DC current have an expected operating DC voltage or inhe... |
H: Overvoltage on input pin of analog switch
I'm building a device, where I need to switch pin between analog signal 0 V-5 V and 12 V digital signal. I was thinking I could use a BL1551 (datasheet) or similar analog switch to shut off the analog signal source when I want to apply the 12 V signal. Input pin of the anal... |
H: Emergency brake BLDC motor
I am redesigning a flawed safety system for an autonomous robot. The robot will drive alongside humans and roads, thus it needs redundancy. The braking is achieved in two ways:
The motor controller of one wheel has a function called STO (safety torque off) which will stop the motor contr... |
H: Induction setup is not working, need help in locating where the problem is
I have an induction setup that I have in the picture below:
According to Faraday's Law, a changing magnetic field of a primary coil causes an instantaneous change in emf of the other coil. I have 60Hz AC from the variac so like a transforme... |
H: Transmission gate conducting in OFF state
Here is a part of my circuit that I am trying to simulate in cadence virtuoso. It has two transmission gates, the one in path of charging the capacitor is on and other one is OFF. Supply voltage is kept at 1V and MOS dimensions are L=45nm , W=300nm for first stage and W=120... |
H: Solving the open circuit voltage and voltages not summing up to zero
I tried solving this circuit using mesh analysis. I actually do not understand on how I can find the voltage in the open part. Moreover, the voltages of resistors in some loops are not summing up to zero. I am thinking that the given polarities af... |
H: Is this a reasonable way to drive an H-bridge?
I currently need to drive a 400W (12-48V) DC motor via an H bridge.
Therefore, I set out to think of a way to drive the motor itself and came up with something like this:
I use drivers to drive the two sides of the bridge and Q5 to modulate the voltage (via PWM) in th... |
H: When does one have to take cable capacitance into consideration?
When feeding an RF signal to a coaxial transmission line, when do you have to take into consideration the capacitance of the cable? I am working with a 36 MHz signal. The total cable length is ~3 ft (RG316 with SMA connectors).
The source and load imp... |
H: Indoor SISO wireless Rician channel performance
In wireless communications and when you have a SISO system, multipath is considered to be an impairment according to theory.
Suppose now that we have an indoor SISO Rician channel (a strong line of sight path accompanied with some multipath), can the existence of the... |
H: Can high GPIOs sink current?
The DRV103 has an input, which sources a constant current. A Resistor is used to configure the parameter associated but it is also possible to apply a voltage, if it can sink that current (A few µA).
If I now were to connect a generic GPIO of a generic µC, with a lower supply voltage, t... |
H: How to use units given for heatsink thermal resistance?
In looking for a heatsink I came across a company giving the thermal resistance of extrusions in °C/W/3in. How do I use this?
Say I use an extrusion with a specification of 1.5 °C/W/3in and get it cut to a length of 10 inches. I want to know delta-T for a 10... |
H: Current through virtual ground in op-amps
I am currently trying to understand op-amps. I found a video on youtube about I to V convertor and I am wondering since we have a virtual ground, due to $$V_1 = V_2$$ and then there is ground right below the current source (so we have ground on both sides of the source) why... |
H: Replacing headphone wire
I am trying to replace a broken head phone wire (with three terminals).
Here is the overview of the headphone, showing the broken part:
Here is the close up of the other end, showing it has three terminals (or wires):
I am thinking of buying this(https://www.amazon.com/dp/B07Y8KGJKL) from ... |
H: What does this strikethrough on the arrow mean? is it not bi-directional?
I'm trying to find out if the main DSP core can communicate with an external DSP via I2S . I'm not sure what that strike-through means.
AI: It means that it is a bus with multiple signals.
It can't be used to determine anything specific about... |
H: Can a servo be controlled (requiring other circuitry) by two binary input pins?
I am working on a project where I would like to control the position of a servo without a normal input, e.g potentiometer. The servo would be constantly powered on the red wire as required, and then I would have 2 input pins. Ideally, i... |
H: Altium: One resistor, mutliple values in library
This question has been asked 8 years ago, but I'm hoping for a new answer.
In the past if I have wanted to create a 0402 resistor and have several different values, I have created several different components and just reused the footprint.
It is now 2022 and I am won... |
H: Creating vibrations from an electromagnet
I am trying to produce vibrations using an electromagnet, with a permanent magnet armature. (Picture below.)
Are the vibrations being produced from the fluctuations in the AC current? Does the electromagnet push and pull the armature to produce the vibrations, or are the vi... |
H: What does this circuit do? (flip flop)
I am trying to understand a circuit which does two arithmetic operations of 5-bit words in 2 cycles:
Q = 2*Q - A (one cycle)
Q = 11*Q (two cycles)
What does this part do?
This is the whole circuit:
AI: A D flip-flop sets its output \$Q\$ equal to its input \$D\$ on a clock ... |
H: Help needed reading an audio transformer wiring schematic & impedance table
I am trying to link a transformer's schematic to its impedance table. I have trouble linking the values to the indivual pins.
For now I would like to use it exactly like in the picture. My understanding is that pins 3 & 4, 9 & 10, 7 & 8 are... |
H: Flux-density increase due to winding inductance
I am currently designing the power transformer or HF-transformer for
the use in a DAB topology and need help in regard of controlling the flux-density swing.
I have already selected the ferrite-core combination required for my use
and calculated the necessary paramete... |
H: Writing bytes to internal flash memory blocks all interrupts on the STM32L0 despite moving the vector table and ISR functions to RAM
The Context
I have a embedded system running on an STM32L053 processor that needs to process STM32 hardware timer interrupts regularly and cannot be disabled. These top-priority inter... |
H: Polling a button and delaying/switching based on the input. Millis? Delay and loop counter?
So this is the setup:
I previously asked a question about this assignment. THIS IS A NEW QUESTION.
THIS IS NEW CODE. ONLY THE IMAGES ARE THE SAME.
I originally approached this using an interrupt on the button, which flipped... |
H: Troubleshooting RS485 UART comms on BeagleBone black or AI
I wrote the following code to trouble shouting the RS485 communication aspect of my firmware.
I use either a Beaglebone black or AI equipped with the cape COMMS 2 (which as a built-in A/B RS485 interface) as the host for this nodejs test code.
[UPDATE A] Th... |
H: Why does Arduino use external ground at the barrel jack side?
Generally, I use ground "GND" from surface ground when designing PCBs with EAGLE, which is made with polygon -> ratsnest.
On Arduinos it looks like the GND pins also use a polygon surface GND, but I have noticed that the barrel jack side uses an external... |
H: Do I misunderstand fuses?
A statement that I often read here goes: "Fuses protect the wire, not the load."
However, in basically all cases I use fuses, I think they are there to protect the load - I.e. the device on that side of the fuse that is opposite to the energy source.
In line with power input for power con... |
H: How to regulate battery voltage
I am using a LiFePo4 battery 26.5 V, 18 Ah in my project where I am using three DC motors
I need a constant voltage for my motors but as the load on one of the motors increases it affects the speed of the other motors in the circuit.
I tried regulating the voltage for the one motor u... |
H: Pullup resistor for automotive protocol like CAN and LIN
I understand that how open collector works on protocol like I2C. However, from my understanding, the automotive protocols like CAN and LIN also use open collector to talk to other devices. LIN is connect to 12v battery whereas CAN is connect to 3.5v and 2.5v.... |
H: Understanding/simulating an old amplifier power supply
I have an old amplifier that was home-built by someone, and I'm trying to reverse-engineer the power supply (for a start) to understand how it works, and to educate myself.
However, I cannot get the supply to regulate, the simulator is showing very odd behavior... |
H: How can I power these LEDs?
I'm trying to build myself a binary clock with a NodeMCU v3 and I am trying to figure out a way to power everything.
I'm trying to use these Pololu 5 V RGB LEDs. They are 5 V, 50 mA LEDs. I need 20 of them (6 for hours, 7 for minutes, 7 for seconds).
If I understand correctly, if I want ... |
H: Apply superposition principle to compute current in the 2 Ω resistor
So in this question what I tried to do was first remove the 6A source and then try to apply the current divider rule according to which the current I = 24 x (4/12) = 8A and then remove the 24A source and then again try to apply the current divider... |
H: Why is the output impedance so high in my differential op-amp?
I tried to make a differential op-amp, but I get around 65k ohm of output impedance.
I read online that op-amps should have ~50ohm to about maximum ~500ohm output impedance, but however I change parameters in this schematic I cannot get it under like 50... |
H: Smoothing an LED where switch is at ground side
simulate this circuit – Schematic created using CircuitLab
When the switch in the circuit is before the resistor (circuit pictured above), I could smooth the LED by placing a capacitor in parallel to the resistor and the LED. Unfortunately, the circuit is as given be... |
H: Breathing effect using a shift register
I want to create a breathing effect but I have 16 RGB LEDs. I also want to arrange these 16 LEDs in a square.
I plan on using a 74HC595 datasheet shift register and an Atmega32 MCU. I have figured out how to create effects like the chasing LED (not dimming them, just running ... |
H: Selecting larger inductors than necessary for cost optimization
I'm designing a board that I want to initially manufacture using JLCPCB for both the board fabrication and assembly. The pricing approach at JLCPCB separates available components into commonly used "basic" components, and less common components labeled... |
H: Lossless quarter wavelength transmission lines
so my lecturer released a past paper with the answers and I have no idea how he got the answer to this question. Please could someone explain it to me? Thanks.
The question is:
A lossless quarter-wavelength transmission line is terminated by a load of 100+j50
Ω at one ... |
H: TMC2209 why are separate motor and logic voltages needed?
Why do motor drivers require separate motor voltage and logic voltage?
I am looking to use a TM2209 stepper motor driver.
Below is a schematic of how I intend to power it. I'll also be using a MCU, currently an Arduino but might switch to a 3.3V Teensy, con... |
H: How to charge a capacitor using a push button?
I am trying to create a single-click logic detector that will hold a voltage of 1 for any single button click made.
If a button press is made, the SR FF will activate, charging the capacitor to 5V since the BJT is also forward biased and the capacitor will be able to ... |
H: Is it possible to make a XNOR gate only with diodes without using a transistor?
I created almost all logic gates with diodes and resistors NOT, OR, NOR, AND, NAND, XOR but i have problems with XNOR and i doubt if it is even possible. I found one but this using a transistor, so my question is, is it possible to make... |
H: How does the transformer insure that the electrical power in the secondary coil is nearly the same as in the primary coil?
My question pretty much sums up everything that I want to ask.
How is the electrical power in the secondary the nearly same as that in the primary coil of a transformer?
Electrical power lost m... |
H: Turning 24V battery to 6V battery help
I have an old RC car I'm trying to get running again. It takes a 6V 600mAh NiCd battery that has a discharge rate of 150mA but doesn't work any more. I wish to replace it with a 24V dewalt battery I have. Initially i thought I could just use a simple resistor or make a voltag... |
H: Is there any effect on efficiency of electromagnet if winding wire cross each other during winding?
While winding a core of the transformer some turns cross other turns. Will this affect the magnetization produced by the core?
AI: For a toroid (a closed magnetic core)
Providing that the windings are electrically i... |
H: Minimum output of Op-amp stuck at 882mV
Why is the output of the Op-amp stuck at 882mV even if the input voltage is 1V (compared to 400mV below)? The output voltage will only increase for voltage 1.07V above. Furthemore, computation states that the output must be negative since the input on the negative terminal i... |
H: I am adding 1 ohm resistor with a coil in series and an connecting to a 25 W DC source. How to choose the correct resistor of 1 ohm?
I am adding 1 ohm resistor with a coil in series and connecting to a 25 W DC source. How to choose the correct resistor of 1 ohm?
Is 1 ohm, 25W resistor is OK for this circuit?
Please... |
H: What is the difference between Antenna gain and Channel gain?
I have a fairly simple question that I've written in the title but just writing this body to meet stack's 'quality standards'
What is the difference between Antenna gain and Channel gain?
AI: antenna gain measures how focussed the beam of an antenna is.
... |
H: PNP transistor as switch
I'm new to electronics. I'm trying to control an an LED with a PNP transistor (Tested with both an S9012 and an S8550).
My circuit is as below:
The base voltage is controlled by an ESP32 GPIO which is either GND or 3.3 V. The result is that in both cases apparently the transistor is satura... |
H: How to use this 2 coil motor as a hand crank?
I found this used motor coil and got a few questions on how I can make it useable as a hand crank.
There are 2 coils with respectively 2 wires each. How exactly do I know the way of how each coil should be powered? I know that +/- are interchangeable for coils but how d... |
H: Problem in implementing D Flip Flop with asynchronous Reset using Verilog
I was implementing the D flip flop with asynchronous reset in Verilog. This is the code that I put in:
module d_ff_A (input Clock, input D, input Rst, output Q);
wire Clock, D, Rst;
reg Q;
always @(negedge (Rst) or posedge (Clock))
begin
if (... |
H: Analysis of a comparator circuit
I am struggling to analyze this (admittedly homework) Op-Amp circuit.
Voltage divider approach
Now if we treat the input into the negative terminal as a voltage divider we get
$$
V_- = 10V* \frac{5}{20}
$$
It has been kindly pointed out in the comments (thank you Andy aka), that t... |
H: Time synchronization of circuits in different places
How can i synchronize times of circuits placed quite far(a few hundreds of meters) from each other?
I thought of using PPS signal from GPS receivers, but I'm not sure about this point:
Are these PPS signals relative in time (as in the figure)? Or is it generated... |
H: XC8, need help. RC3 is holding micro in reset mode
I am trying to write a program for PIC18LF14K50 using MPLAB X and XC8 compiler. So far everything was working fine, but as soon as I set RC3 (input) to 0 and go back to 1, the pic goes into a frozen mode and wont work until I set RC3 to 0 again. The same code was w... |
H: What kind of wire is this? Copper wire with some kind of wool in it
I am trying to repair broken headphone wire with this amazon thing. Here is the first pic showing what I am trying to do:
I made sure that black wire is working by playing something on the phone and measuring the terminals by multimeter and I can ... |
H: Amplifier circuit pulse width
I've made a circuit:
Here is link to this circuit emulator: amplifier circuit
The first scope is a 10 kHz input generator and the second scope is circuit output. Which element should be changed to get the output pulses wider?
Edit:
I found the circuit I was looking for:
How to make s... |
H: How to analyze first-order transient circuits using Simulink?
I have been trying to design a first-order circuit with a capacitor but, I could't achieve to initaliaze the steady-state condition. I mean I was not able to close the switch at t = 0. Since, I am using a dc voltage source, at t = 0 capacitor voltage mus... |
H: Low loss method of connecting two dissimilar battery voltages together without a diode?
TLDR; Is there a simple circuit which delivers a diode's robust reverse-voltage behavior, only with an order of magnitude less heat generation?
I have two lithium batteries with different chemistries and I would like to connect... |
H: Separating power ground from control ground to exceed NMOS threshold voltage
I'm a novice circuit designer looking to create a high voltage source follower NMOS circuit. I originally planned to use a Teensy digital I/O pin as the gate control signal, so when the Teensy outputted high (3.3V) the source follower outp... |
H: Trying to understand powering relay with Raspberry Pi and 12 V electronics
I have a 12 V peristaltic pump, Raspberry Pi, computer PSU, And a 4-channel 5 V relay. I have removed the jumper across jdvcc and bcc. My plan is to power the pump with the 12 V rail on my power supply and control the relay with the Raspberr... |
H: Multipath and antenna radiation pattern
Multipath causes fading in wireless communication systems.
Depending on the RMS delay spread vs the symbol period this fading can be frequency selective or flat
The question is does multipath in any way alter the radiation pattern of the transmit or the receive antennas? and ... |
H: 2.4GHz sender cause 433MHz receiver jammed, vice versa
I have a 433MHz receiver placed near a 2.4GHz sender, and they have about a 20cm gap. When 2.4G is actively sending, the 433M receiver can't hear anything from the 433M sender (433M receiver been jammed by 2.4G sender) and vice versa.
Can I put an RF filter on ... |
H: How does my crowbar circuit look?
Theory of operation: op amp detects higher-than-reference voltage and triggers SCR, which remains in low-impedance state until current drops close to zero (hopefully by blowing the fuse).
Main motivation: sharp and precise over-voltage protection of 3.3V electronics downstream of a... |
H: Solid state relay output connection: Is there a difference between high-side and low-side switch configurations?
I am planning to use this SSR chip.
I decided to use the "Connection C" configuration which is given pictured in the 2nd page of the datasheet.
However, there is something I don't like about this connec... |
H: DC Motor residual voltage suppression
I fitted two 12 V DC cooling fans in my car that turn ON and OFF when the coolant temperature is above a certain threshold.
When the fans turn OFF, the inertia of the fans slowing down generates a residual voltage that slowly goes to 0 V within 3-5 seconds.
I would like to get ... |
H: Instrumentation amplifier AD8293G160 - Why RC filter calculations don't match?
I am using an AD8293G160 to handle a signal, for a known bandwidth.
The part is an INA with a fixed internal gain of 160x. It has 2 outputs, one direct, the other with an integrated 5k resistor to simplify antialiasing filters for ADC co... |
H: What is wrong with my ripple BCD down counter circuit?
I want to implement a BCD ripple down-counter in Proteus.
The following is my circuit. The logic is simple. When the "original" 4-bit binary ripple counter reaches 1111 (15), the 2nd and 3rd flip-flops must reset to 0. To this end, I AND the outputs of all flip... |
H: What is this torque I am measuring?
I have a small brushless motor running at 3 V and a cardboard disc (about 5.5 cm radius, 3 mm thick) which can be attached and detached from the shaft of the motor. When the disc is not attached the current drawn is 0.015 A and 0.11 A when the disc is attached.
I agree that the a... |
H: Which connector is this on my camera?
I'm currently investigating an Azure Percept vision device which apparently has 2x MIPI ports as described here. The back of the module looks like this. One of the connectors to which a camera is attached is marked with an arrow:
These don't look like the MIPI connectors I kno... |
H: Using a relay to turn PWM signal ON/OFF
I've been gaining understanding about using relays to control PWM signal (ON/OFF).
Setup: Pixhawk generates PWM signals and sends it to motor controllers to control the 24V DC motor's speed.
Goal: To place a relay in between the Pixhawk and motor controllers to turn the spinn... |
H: Are reference resistors required for VRP and VRN when implementing an DDR2 memory controller in an Artix-7 device?
The generated pinout does not list any VRP or VRN pins, or anything similar.
I have specified internal impedance for the DDR2 IF pins with IO standard SSTL18_II. On previous and other FPGAs, it is the... |
H: Timer0 loop not working on PIC12F508
I'm quite new in programming PICS, but have already done some projects. All of them were working fine. But now I'm stuck with a very simple one and I don't find out what's wrong. I'm pretty sure that's due to some really silly mistake, but due to the lack of debugging support of... |
H: Why is it dangerous use a coiled extension cord?
What aspect of using a coiled extension cord makes it more dangerous than using an unrolled power cord?
Many fire safety websites say that an extension cord should not be used while coiled.
Is this due to the cord acting as an air core inductor? I can't really see wh... |
H: Is there a way to step up voltage without consuming power when there's no load?
Is it possible to take a lower DC voltage, such as the 1.5v from a AA battery, and step it up to a higher DC voltage, such as 5v, which keeps that 5v potential even when there is no load, and which doesn't consume any power when there's... |
H: exactly why does a capacitor build up charge when hooked up to a battery?
I understand how the capacitor "holds" charge. If one plate is positive, and the other is negative, the particles are attracted to each other. Connect both sides by a wire and instant flow.
However, I am confused why the charge gets built up... |
H: Help understanding simple OP-Amp
Im trying to understand this basic circuit from a book.
The book said:
"The analysis is simple, if you remember your golden rules:
(The golden rules:
I. The output attempts to do whatever is
necessary to make the voltage difference
between the inputs zero.
II. The inputs draw no cu... |
H: OP amp V+ and V- confusion
I am trying to find Vout in the following image
What I have found from searching a bit is that the op-amps v- and v+ are supposed to be equal to each other.
$$ V^- = V^+ $$
In the case above I run in to the issue that what ever the op-amps range(-15v to 15v) is equal to Vout. This mean... |
H: A questions about negative resistance?
I would like to look at negative resistance from a practical point of view, not just theory. Would you answer my questions,please?
The op-amp, R1, R2, and R3 behave as a negative resistance: Rn = - 100 ohms.
R4 is in series with the negative resistance.
1- If I constructed th... |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.