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H: Level shifter circuit with 50 V output
I am looking for a level shifter circuit, that can convert 5V to 50V logic. I've been looking through some designs. I see a lot of designs uses a current mirror for this. And was wondering, what is the advantage of using a current mirror type level shifter as opposed to a more... |
H: Bit persistence on a Hard Disk Drive
I was wondering if there was a time limit to the "persistence" of bits on a hard drive, a classical SATA for example.
If I'm correct, bits are written by a magnetizing head in some cells on the hard drive. Depending on the magnetization, It will be a 0 or a 1.
But my question is... |
H: DC Questions and my understanding
Okay, we had a seriously bad science teacher this year, and long story short, we hardly understood anything relating to DC current(she was fired a few days ago).
I understand Ohm's Law:
Working out current from voltage/resistance
Working out resistance from voltage/current
Working ... |
H: Sampling: how to determine a "good" sampling rate based on a given filter
I assume that the sampling rate is w_s = 2w_max if we have an ideal low-pass filter that nulls frequencies whose absolute value is higher than that of w_max. Therefore, that the only reason for oversampling is to compensate for the imperfect ... |
H: In adaptive signal processing, what does it mean for an arrow to go through a block?
For example, in this case the FIR digital filter has an arrow going through it. This is common in the signal processing comunity but very unintuitive from a control perspective i.e. where is the arrow going to?
Can someone care to... |
H: Turned arduino 5vdc analog pin to 0vdc (gnd) in order to mimic a momentary switch
I'm just wondering how I would go about getting the normal 5vdc that comes out of the Arduino analog/digital pins to a 0vdc signal? I wanting to mimic a push button (momentary switch) so that it acts as if I am pushing a button on a r... |
H: Switch 15V source with a MOS by digital 0/5V (dc)
I'm trying to switch on and off some 15V devices from Arduino Uno digital ports (0/5V). Each port must control a group of resistive loads (lights) of a train model. There are about 10 groups of loads, and I'd like to keep simple the switching circuits. From now on I... |
H: Battery heating up instead of a coil in a simple heat circuit
I am making a simple heat circuit using 9v battery and a coil made up of AWG 18-gauge copper wire (electrical engineering newbie working on a fun project). I followed these steps http://www.ehow.com/how_10022230_make-heat-circuit.html but what happens is... |
H: input amps for 10 amp power supply
I am looking at installing some LED lighting which requires a 12v DC 10 amp power supply. The question which I cant seem to find an answer for is this...
I live in the UK which uses a nominal 240 v AC mains power, so what would the power draw be on the power supply? ie. what woul... |
H: CD4050 Voltage leaks, what can I be doing wrong?
As often as I see the CD4050 used as a logic level converter, I'm surprised that I haven't heard much about how it seems to leak voltage from the inputs into Vdd. I hope this isn't a case where the chips I purchased are simply not working correctly.
The version I'm ... |
H: Determine the correct capacitors value
what the right way to determine the correct capacitors value needed for a avr-chip with a crystal oscillator?
Let say the crystal's load capacitance is: 20pF
and i want to use: atmega8-16pu
what should i look for and what the math behind it?
please don't just tell me to use 2x... |
H: Problems getting an SSR to turn on
Has anyone had problems getting a solid state relay to work?
EDIT: see Spehro Pefhany's answer. Lessons learned:
don't accidentally take out current limiting resistor
solid state relay rated for AC load will probably just turn on small DC load.
It makes a LOT of sense that since... |
H: Thevenin equivalent of the input of an op amp?
In the image above, the subcircuit in the box in the top circuit is reduced to the subcircuit in the light box below it using Thevenin's Theorem. I don't really see how to get a Thevenin equivalent out of the first circuit. I spent a while on it to no avail - could so... |
H: Truth Table, Full-adder
I'm trying to solve two questions that I am unsure how to approach. I know boolean means true/false but that's about it.
The question reads: "A boolean equation in sum-of-products can be minimized as Y = AB + BD + ACD. I'm not sure how to approach this. I see binary numbers. and the soluti... |
H: Pad hole size for 0.1" Male Headers
I created an Eagle part that has several holes to solder 0.1" pitched break away male headers to, such as the one below.
However the pad has a hole thats too narrow for the header! What drill size should be used? I used the default of 0.03149606
AI: SparkFun has an Eagle library... |
H: Help with complex power and power factor correction problem
I'm having a bit of trouble trying to understand what is being asked of me in a relatively basic circuit theory question involving complex power and power factor correction.
Now, part (b) and (c) seem easy enough to answer given enough information but I ... |
H: DC Power supply Jack connector pinout
I'm trying to make a footprint for this connector:
But I have a trouble about pinout.
What is the SLEEVE TERMINAL, TIP TERMINAL, SHUNT TERMINAL?
What is my power connection? V+ and GND?
AI: The schematic of a typical coaxial (barrel type) power jack looks like this:
In that s... |
H: Why is my DCDC getting fried when driving a stepper motor
I'm trying to get a stepper motor running using an L6470 stepper driver. L6470 is connected according to the recommended design.
The motor is a NEMA23, rated 2A, inductance of 5.2mH and resistance of 1.9Ohm/phase.
The L6470 is connected to an MCU the drives ... |
H: Opamp Misbehaving in Constant Current Source Circuit
I'm planning to build a current regulator for a power supply and I'm prototyping a number of different regulator circuits. First up, the op amp and transistor circuit shown below.
I felt I understood the principle well enough: negative feedback resulting in the... |
H: How to interface 1 MSPS ADC with processing module in FPGA?
I have DE1-SoC board which contains 1 MSPS ADC, I am trying to take samples from ADC and process them. ADC Controller clock is 20 MHz and data is available every 16 clock cycles. The module that takes samples operates on 100 MHz clock. The problem is how c... |
H: What is the LCCDE equation of this block diagram?
I can't find the LCCDE equation of this system. I try to reduce but thing will get complicated.
AI: I assume D is a "sample" delay making (e.g.) e[n] into e[n-1]. Use the standard form for a delay of the multiplier \$Z^{-1}\$ and just treat it like algebra i.e.
e[n... |
H: Mixing battery sizes
Apologies if this is the wrong Stack. I suspect this is a bit of a lowest-common-denominator question. I've got a cheap little Christmas tree covered in blue festive lights that takes 3 size-C batteries. I only had 2 size-C batteries.
Knowing literally nothing of electronics (asides "don't stic... |
H: Mosfet PWM signal not square
I'm a beginner learning about electronics, currently trying to control a DC motor using a PWM signal. I got it to work, but want to understand what I'm seeing using an oscilloscope and optimize it.
I'm using an Arduino Uno to generate a PWM signal which is switching a Mosfet (IRF520) to... |
H: Power factor correction in a simple phasor circuit
I've been having a bit of trouble with a relatively simple power factor correction problem involving a simple circuit in the frequency domain (\$f=50\,\text{Hz},\omega=2\pi f=100\pi\,\text{rad/s}\$).
From what I can tell, my first step is to determine the complex ... |
H: Mesh Analysis on AC circuit
I'm doing a practice problem and I'm unsure how my approach did not receive the same result as the solution. Any help would be appreciated.
Below is the Figure along with the solution as well as my hand written approach. I hope it is readable. Thank you..
AI: You wrote your \$I_3\$ equat... |
H: Failed to open file in Verilog on EDA Playground site
I tried to open a file ff.txt and write into it some random numbers, say seven times. I used EDA playground website for it:
http://www.edaplayground.com/x/TCC
When I try to run, I get this error:
# ** Warning: (vsim-3533) [FOFIW] - Failed to open file "ff.txt" f... |
H: Protecting resistor value for zener diode in parallel with load
I want to select x as resistance for the protecting resistor (upper).
The zener diode can hold up to 4A
If I was guaranteed to have current through zener lower than 4A, I could consider its voltage to be 5.1V and the voltage through load to be 5.1 V.
... |
H: Understanding astable multivibrators
I've been trying to understand the astable multivibrator shown above. Wikipedia has a pretty good description. But I've tried to write it up on my blog in my own words here: http://41j.com/blog/2014/12/astable-multivibrator-oscillator/
I'm uncertain about the following things:
... |
H: I just blew a capacitor. Now what?
We worked two years on and off on this project at my friend's place. Finally we finish, I take it home. There's a power supply unit but it can't be connected directly to mains, it expects some lower AC voltage. There's a bridge rectifier and a cap directly after the input. I had a... |
H: What's the purpose of adding a parallel impedance to a relay circuit?
This is the relay section of a PIR Sensor I have taken apart.:
L_FUSED is 240VAC, and the relay is intended to turn on a light bulb from "OUT" (standard edison screw), so it could be incandescent, fluorescent, or LED.
What is the purpose of the ... |
H: How to use relay switch
I have a relay switch. Particularly, leone SC5-S-DC6V.
I am a noob who wants to use this relay switch. And I don't know how to operate it. Can someone please help me?
For now, I just want to use it with a 6V DC power supply to change the state of switch.
I'm sorry if the question is stupid(I... |
H: Can I solder 4 AA batteries together in series and make my own rechargeable battery pack?
I've bought my young son a couple of remote control tanks for Christmas. They are supplied with two rechargeable 'battery packs' (4 x AA batteries heat shrunk together). The battery pack supplied is Ni-Cd 400mAh 4.8V
The charg... |
H: Understanding the oscillation action inside this 12V DC-to-AC CKT
A friend brought this circuit to me and asked me to explain the working.
I decoded the following schematic from the PCB.
simulate this circuit – Schematic created using CircuitLab
In the primary coil of the transformer I measured about 19KHz 1... |
H: Unable to delete Trace in Eagle
After running the design through the Errors Tool and moving a route that had insufficient clearance, I'm left with this blue segment that is overlaying the red route.
Why is it there and how can it be removed?
Another unwanted blue segment.
AI: That's not actually a trace. That's a... |
H: 303 Mhz Wireless Transmitter
I am in need of a 303 MHz transmitter. Similar to this (just different freq):
https://www.sparkfun.com/products/10534
If I purchase the item above and replace the crystal with a 303 MHz one like this:
http://www.mouser.com/ProductDetail/Murata-Electronics/RO2043/?qs=Ps7QaYwWPwweGuQ2BJk... |
H: Why do only thick wires have less resistance?
I have learned that the thicker a wire is, the less resistance it has. However, this is not the case for other things such as a wall. If a (non-metal) wall is thicker it does not have a lower resistance. Why is this?
AI: Resistance in a wire can be defined as
$$R = \fra... |
H: Shared antenna on multiple 2.4Ghz receivers
I want to use several 2.4 Ghz transcievers (not sure which IC yet, either Atmel AT86RF*** or TI CC) in order to build a simultaneous multi-channel sniffer. The transciever output is differential. I am not interested in transmitting anything.
Is there any way I can use a s... |
H: Finding Instruction Count
Computer A has an overall CPI of 1.3 and can be run at a clock rate of 600MHz.
Computer B has a CPI of 2.5 and can be run at a clock rate of 750 Mhz. We have a particular program we wish to run. When compiled for computer A, this program has exactly 100,000 instructions. How many instructi... |
H: How does this inductive musical-keyboard function?
I've been looking to interface with a keyboard that I've removed from a non-functional system, specifically an Ensoniq EPS-16. As luck would have it, I managed to find schematics for the controller board, which handles the output of inductive sensors underneath the... |
H: Thevenin Equivalent Circuit
Been solving this for hours please help. My answer is written on ink. The correct answer is given.
I tried Nodal Analysis and got Va = -100 V at node A (beside -100V)
and then
KCL@A: -0.01V1+Va/20k = 0 ; Since Va=-100, V1 = -0.5V <-- from here I know something is wrong
For Isc: (Imagine ... |
H: Bluetooth - NFC communcation
I want to build a device that would recieve a NFC TAG and send it via Bluetooth to the Mobile Phone, that has Bluetooth enabled.
I am searching for some basic articles or some starting points on how to accomplish this.
I am thinking that I'll need some sort of uController that will tran... |
H: In an SDRAM how do address rows/columns and rank width and bank width relate to the total memory size?
I have a Micron SDRAM (MT16KTF1G64HZ-8GB). The size of the memory is 8GB. I did some calucaltions and 8GB of data means 2^36 bits capacity. Now when I look in the Micron data sheet, the row address is 16 bits wide... |
H: Capacitor/resistor effect on audio signal
I have a pair of 20 years old electrostatic speakers that have an analog first order high-pass filter before the electrostatic panels, so there is a capacitor in the audio signal path. The original capacitors were electrolytic (I suppose the capacitors were about the same a... |
H: phase-shift oscillator design decisions
I've been learning about phase-shift oscillators and put together this design:
I built it and it seems to work pretty well, you can see the exact values I used, and design here: [1]. But the design I used seems different from a lot of those I've seen online. Most designs put... |
H: What's an industry standard in electrical engineering?
Context: One of my colleague is arguing I can't use one of my baseline equipment for a long lifetime (15years) product because it is not an "industry standard" and might become obsolete and unsupported during that timescale.
Question:
So when should we conside... |
H: Sourcing An Image Sensor?
I'm wanting to create a basic digital camera, I have most of it figured out... except for the image sensor itself. Looking in the normal places (digikey, mouser), I'm finding some very basic, low resolution, poor performance sensors from Omnivision. Realistically, I'd like the camera to be... |
H: How to minimize characteristic impedance mismatches caused by vias?
This question springs from an answer here.
When using stripline configurations for rf signalling, the conductors are routed on an inner layer of the pcb, sandwiched between two ground planes.
I understand that vias cause mismatches in the characte... |
H: How does this DC/DC converter work
I've got my hands on a bunch of old garden lights with solar panels, and of course I disassembled them and found that they use just one 1.5V accumulator cell to light up the LED.
Just for illustration
I've managed to get the schematic from the PCB (I hope it's correct):
R1 ... 1... |
H: Latching solenoid control
I am working on a personal project that will involve driving a latching 9V/DC solenoid from an arduino. The circuit I've come up with is dependent on two things, that I haven't quite figured out yet:
1) The arduino needs to provide a DC voltage for a timed interval. This is to power a SPDT... |
H: Use Cases for an External ADC
Most Microcontrollers (uC) have an Analog to Digital Converter (ADC) as part of their peripheral set, which is phenomenal as this integrates two components into a single package. These ADCs are usually register mapped as well, which allows the data to be extracted quickly and easily.
... |
H: Question about old telephones (late 70's - early 80's)
This question refers to old landline telephones that would have been used in households in Sweden in the late 70's and early 80's. I would think that this was probably similar to phone technology used elsewhere during that time period (except maybe North Americ... |
H: First steps in building Switching power supplies
I want to make a 50Amps switching power supply, I have already done 10A linear ones succesfully
This time it has to be a switching power supply one so, any ideas or tips of where to start are appreciated
IF I succed and works as intended this will end up being used t... |
H: What is the relation between the power dissipation in resistor and the temperature rise
Which relation we use to calculate the temperature rise in resistor using the power dissipation. If we take P=R*I^2 from resistor, how much the resistor heats in this case ? I know that in transsitor the relation between th... |
H: LM386 emitting voltage to input line
there is around +4mV that emitted by input pin (pin2) to the ground in lm386 my question is:
1. is that normal?
2. will it damage IC audio in laptop ?
3. if (number 2 is yes) then i need to put capacitor between input pin and line out laptop, will it ruin the original audio sign... |
H: Which current should I use to determine the Watt?
I am making a heated blanket and I have some troubles to determine the heat that will be generated.
Resistance:
Let say, I use this heated cable with a resistance of 0.3 Ohms/m*.
If I am using 10m of this cable the resistance will be 3 ohms.
Voltage: I will use a A... |
H: What happens if the input of a voltage regulator gets out of the operating range?
I know that for a linear regulator to go into regulation, it is necessary to maintain (at least) a specific dropout voltage between its input and output.
But what happens if the input voltage drops so much that it will be closer to th... |
H: A-GPS, cell tower, and provider service
I am not sure if I used the right forum to ask this question. If it is wrong, please point me the right one.
I understand in general how A-GPS works with cell towers, and how it depends on the data signal. But there are some thing I don't understand fully yet.
I have one phon... |
H: Assumptions for an op-amp and when they do and don't hold?
Correct me if I am wrong but the following is what I think the assumptions we make for an ideal op-amp:
Negative feedback (output connected to the inverting input):
No current goes into either of the inputs
The voltage at each of the inputs is the same
We ... |
H: Value of omega from forced response V0
Based on figure.
Maybe a simple question, but I'd like to know why that if forced response is zero, then
$$\omega L = \frac{1}{\omega C}$$
where \$L\$ is the inductance and \$C\$ is the capacitance.
Where in this case, \$\omega\$ can be solved for to obtain the answer.
AI: B... |
H: 5-12v ~15w simple class a audio amp & build to 2.1 pc speaker
is there any IC that take 5-12v input and 15 w output class A amplifier for 2.1 ch pc speaker?(can be mono amp) because i've search google and found ic that only take more than 15v DC power supply, and how to connect subwoofer in 2.0?
AI: The simple answ... |
H: Interfacing tri-state logic across 3v3/5v. Do buffers mirror all three logic states?
(This is just learning/hobby stuff...)
I have a 5v (tri-state TTL, ZX Spectrum) bus and I want to interface some non-5v tolerant 3v3 chips to it.
I think I need buffers or transceivers for the level conversion. (Is a buffer just a... |
H: High voltage and electric shock
I have some silly question that I hope someone can answer.
If a coord, connected to the wall socket, is damaged exposing the wires inside, and one accidentally touches these wires, would the current going through the body to the ground be lethal. I would assume it is, but I have rea... |
H: PCM1804 Output distorted
I am using an TI PCM1804 to convert my audio signal.
The PCM1804 is configured as follows:
Master Mode, with 12.288MHz input clock
Sample rate: 48kHz
The testsignal is a 440Hz sine with an amplitude of 4.5V_pp. In order to get a balanced signal from the signal generator, I use a circuit whi... |
H: Spi MOSI connected to gnd
Hello iam looking at someone's pcb design and they have the MOSI pin connected to one of the IC's GND pin.The spi interface pins are not being used at all on this IC except the MOSI to GND.
Another weird thing is the MOSI trace isnt a direct trace to GND.It looks like there is a 0805 smd f... |
H: OpenOCD child process termination: Wrong device detected
Setup
I have an STM32F103C8T6 minimal eval board (see STM32F103C8T6).
And I'm using an ST link like the picture below.
I installed System Workbench for Eclipse. I created my own project (C++, Empty Project, toolchains: Ac6 STM 32 MCU GCC),
Series: STM32F1, M... |
H: Question about PCB layer stackup
I made multi layer with Altium PCB board wizard.
I assigned two signal plane on each surface(top and bottom layer) and two internal plane(power and ground).
On layer stack manager, there is no dielectric on interface of Top Layer - Power plane and Power Plane - Ground Plane(As you ... |
H: Varying frequency by percentage, rather than with linear resistance?
I'm using a 555 timer to generate musical tones, and employing resistors to get various pitches. Instead of resistance by linear amounts (ie. 1KOhm) , is there a way to apply resistance by percentage? For example, is there a type of resistor or ... |
H: Can I connect a 5 V CAN transceiver to a 3.3 V microcontroller?
I have a CAN circuit from another project, and I want to reuse it and connect to my microcontroller, however it is a 5V transceiver and my microcontroller is 3.3 V, is it OK to connect TX and RX directly to my microcontroller?
Microcontroller: http://w... |
H: Why the implementation of current sensing network (CSN) by sensing the switch current is simpler than that of sensing inductor current?
The excerpt below is from the book Pulsewidth Modulated DC-to-DC Power Conversion: Circuits, Dynamics, and Control Designs by Byungcho Choi.
It looks a bit long but my main questio... |
H: Some questions about a simple high voltage circuit
The schematic below occurs as an example circuit in a set of lecture notes that I'm using. It is a circuit for building up a high voltage across the capacitor \$C\$ using a constant voltage \$V_0\$.
I understand how the circuit works, but would like to know the fol... |
H: When to use the word inductance and when to use inductivity?
I sometimes need to fill in revision tables for inductive components and i always stumble upon whether it's "Turns changed. Inductance updated." OR "Turns changed. Inductivity updated." .
AI: Inductivity is not an used term in EE
(or at least i have never... |
H: Swap FET TO-220 pinout
I messed up my PCB design when I made a change of FET-model. Now the Drain and the Source pins are swapped and it seems that there are no TO-220 models made this way (1-Gate, 2-Source, 3-Drain). Are there any pinouts like this, or do you have any other solution? Making a new PCB is too expens... |
H: Mains AC TRIAC offset circuit
I'm designing a fluorescent lamp dimmer circuit which will work with Arduino pro mini.
The mcu will detect zero cross from mains outlet and will give out offset for TRIAC.
I would just like to get sanity-check on this circuit, why it would or wouldn't work?
X_DETECT_IN - Zero cross ... |
H: DC offset of amplifiers for 12V single supply operation
I want to be able to amplify a signal using op-amps and a single power supply. In order for the op-amps to have maximum swing with a 12V power supply the AC input signal needs to be offsetted to 6V.
After constructing the circuit on a breadboard, the output w... |
H: Batteries. Why use 9V?
With all the technology available today with being able to boost voltage efficiently using SMPS, why do we still use 9V batteries? Is there some secret advantage with them that I am unaware of?
If you look at the size as well, the 9V is just big and bulky and I have designed projects where I... |
H: How to find output of ideal op-amp system?
[edited the picture]
I have the op-amp system like this. I've just learnt how to apply the characteristic of each O-A for finding the output (using the given Av formula for inverted amplifier or integrator O-A). But for this we just can assume the O-A is ideal and have to... |
H: Notch filter design - resistor value
I'm trying to design a notch filter to suppress an oscillator signal coming through a mixer (namely, 53.125 MHz), at the same time I must get the best possible signal at 60 MHz.
I've been running some simulations - it seems lowering the capacitor value and increasing the inducto... |
H: A question about power amplification concept of a BJT
In a text I'm confused about a part concerning BJT transistor operation:
Below is the paragraph regarding the above transistor models:
The text explains the transistor operation for the PNP transistor.
What does the text mean here? It says "the output circuit ... |
H: Problem with mosfet in H-bridge
I am using 4 IRF840 N-channel mosfet,converting 325VDC to 230VAC with SPWM and H-bridge.I have no problem with resistive load,but when I connect inductive load or a device with capacitor power supply,mosfets of one side burn.here is m circuit:
M question is:Would placing 350V TVS dio... |
H: Powering a 5v relay from a 12v power supply
I have a relay which is rated for 5v. My power supply is 12v.
I have measured the resistance across the coil as 400 ohm.
If I place the relay in series with a resistor that is 560 ohm, would it correctly lower the voltage to 5v?
Or is there something more complicated goi... |
H: High pass filter with triangle wave output
I'm having a problem with a high pass filter, maybe someone has an idea how to fix it.
Initially I have an IC that provides a sinusoidal signal of approximately 0 to 3V positive with a frequency varying between
50KHz and 100KHz (Figure 1).
Figure 1
The purpose of my high ... |
H: Exposed copper on PCB
I tried to separate soldering on a Raspberry Pi but exposed some copper. The Raspberry Pi boots just fine. Is this safe?
AI: That copper is most likely the ground fill unless there was a trace
there before. If there was a trace there as long as you did not
damage the trace you should be ... |
H: Understanding LED specifications (hobby kit)
I have an LED that looks like:
It did not come with specs for the LED. In laymens terms, I'm trying to determine the technical term for the following descriptions.
(What is the max amount of current that can flow through this type of LED before it becomes 'unsafe' and bl... |
H: RPI3 - Onboard PSU 230VAC to 12/5VDC?
I'm thinking of creating a project with a RPI3 and LED strip for home automation. And I want it to keep it as «clean» as possible, less cable mess is better. The RGB LED strip is working at 12VDC, and the RPI3 works at 5VDC.
So I was thinking of soldering a PCB that fits on to... |
H: DC power adapter leakage safety
Today while installing a 12v LED strip on my windows with the power adapter plugged but the LED turned off, I noticed the led that I pushed down against the wall got turned on partially. It wasn't right. My finger shouldn't have enough resistance to turn on those led with 12v. Right ... |
H: band / cylinder style heating element wattage calculations
The question concerns band or cylinder heating elements, which are designed to clamp around a hollow cylinder and heat whatever is flowing through it.
I'm looking for information on how to calculate the wattage required to heat room-temperature air (let's s... |
H: 9V powering to the safest maximum brightness of 4 IR LEDs in series
I have created a circuit which powers 4 infrared LEDs (datasheet as shown below).
I wanted to know if I am very close to getting the maximum brightness out of my LEDs. Here is my schematic:
9V DC-22 ohms resistor-4 IR LEDs (in series)-GROUND
AI: As... |
H: Diode characteristic measurement - initial tester settings
While doing the diode characteristics experiment I was instructed to keep the voltage at zero and current at max before starting the power supply. Can I know the reason why?
AI: I'm assuming you are talking about using a bench power supply.
Under normal ex... |
H: qucs capacitor simulation
I was playing with qucs and noticed that capacitors are not simulated as I expected. I designed simplest circuit that illustrates that case.
AC Source: 2 Hz (2 times a a second)
Capacitor: 1pF
Simulation: 1 second
I expected to see different graphs on Probe 1 and Probe 2 BUT they are same... |
H: Wiring diagram for USB-C to USB-A cable?
I make USB cables (USB-A to Mini or Micro primarily), but don't have any experience with USB-C. I would like to create a cable that has a USB-A (2.0) connector on one end, and a USB-C connector on the other (mainly for connecting keyboards to CPUs, and charging devices). How... |
H: Why does a timing light connect to 12 V?
I'm curious why an ignition timing light needs to connect to the battery to work.
I may not be fully understanding how they work, but I'm guessing there's an inductive pick up and that illuminates the bulb.
So couldn't just that inductive kick be enough to light the bulb?
AI... |
H: Determining base-emitter voltage in a CE BJT with base supplied by constant current source
I apologize in advance for posting a homework problem. I am given this simple BJT circuit as shown below. I have to find the base-emitter voltage with reverse beta equal to 0.5 and forward beta 50. Also a saturation current o... |
H: How to handle multiple GND, and +5v vs VCC
I'm starting my hobby electronics journey. I know how to read all the symbols and know how to solder. But I'm a bit confused with reading schematics that have multiple GND and the difference between VCC vs +5v.
Please take a look at this schematic.
Where do the grou... |
H: Looking for the safest resistance for Parallel-series LEDs
I have 8 identical infrared LEDs (datasheet as shown below) connected like so:
I am trying to determine the correct R1 and R2 values to achieve 80 mA current in each of the LEDs. Help
AI: You will NOT be able to pick a value to guarantee just under 100mA.... |
H: Can someone check this so I don't fry someone's gps/transponder?
I am helping someone out over at aviation stack exchange -- they want a signal led for their gps receiver to do a preflight check to make sure it is working. They basically want to be able to press a button and see if the tx line is hot (as it shou... |
H: Voltage for motor driver
I am using a Pololu DRV8355 dual motor driver. According to the specs, it requires voltage between 1.5V and 11V to operate. I'd like to use two 3V motors with it, and also power an Arduino (Mega 2560) board through it. Since I'm a complete beginner, I am not sure about the input voltage I s... |
H: Resistor in series with a Diode conducting conditions
When having a resistor(R) in series with a diode(D), i keep seeing that in order for the diode to be conducting electricity the voltage on the branch R+D should be higher than the diodes potential.
But what happens to the voltage drop on the resistor, why doesn'... |
H: Overdriving LEDs with high currents
I'm trying to drive LEDs for the purposes of a strobe light. I'm planning on driving the LEDs at ~60 fps, and for ~100 us pulses to provide very sharp strobe images.
If the pulses are very short and infrequent, you end up needing extremely bright LEDs to make up for how infreque... |
H: Reprogramming a computer mouse's internal IC?
I have a mouse with an internal IC: SPCP168A, having read about it, I discovered that it is specifically designed and programmed for the mouse functionality.
I am interested in reprogramming the device to be able to use its "camera" (160frame/s).
My questions are:
Can ... |
H: Op Amp Output having oscillation
In my signal processing chain, the first stage is an inverting gain stage using Op AMP LT6200CS8-10.
My output DC operating point is 1.24 V. I am providing an exponential signal (Amplitude 1mV) as the input. This is my schematic:
C43 is not populated. The layout is shown below:
Th... |
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