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H: LD1117 Heat Sink
I'm about to put a LD1117 Low drop-out regulator in SOT-223 package into one of my projects and wonder if the heat sink is internally connected to anything.
Unfortunately the data-sheet doesn't mention the heat sink lug at all but states that the device is "pin to pin compatible with the other sta... |
H: Having an issue of implementing an 8 bit counter from two 4 bit counters
So I'm having an issue of implementing an 8 bit counter from two 4 bit counters. The first 4 bit works when initiated by the clock pulse and so does the second separately with its own clock pulse. How could I use just one clock to send pulses ... |
H: A question about very simple light Dimmer circuit?
I've learned that a Triac works as a switch for controlling AC current. Why not connecting the load (L1) and Triac in series? at the position of red arrow? My reason is that a small amount of current will always flows at the direction of green arrow. So, the load w... |
H: Crosstalk between Ethernet and Analog Signals on PCB
I am wondering the possibility of crosstalk between the two ethernet lines and an analog signal.
The ethernet will operate at 100MHz. If I place positive and negative traces in parallel and place them sufficiently away(is 5 times the Width of the trace enough?) ... |
H: Switch between 3 states?
I would like to create a circuit board that can toggle between 3 states, only with the press of a button.
So when pressing the button, the board should go to the next state, and at the last state, should loop back to the first.
The 3 states are like this, using 2 LEDs:
LED 1 is on, LED 2 i... |
H: Check for if I've picked the correct flyback and zener diodes for a solenoid valve driver
I want to use an arduino power driver shield which contains the RFP30N06LE MOSFET to drive the 12V version of a solenoid valve which has a power consumption of 2.0 Watts (so 167 mA current draw I think?).
The power driver cir... |
H: Difference between RSSI and Received Power
Is Received Power and RSSI same thing? I have been looking into it and think they are the same. But please guide me the difference between them if they are not the same.
AI: No it is not, RSSI only gives an indication of the received power. If you would have a large interf... |
H: Why does the capacitance on a line disappear when properly terminated?
Came across an Adafruit interview with the one and only Paul Horowitz and he said something interesting. Part of interview thats related to this question
He said in more or less words that the capacitance of a line disappears when the cable is t... |
H: Electrical connection that is "AND NOT" gate
I need to create an electrical switch on normal net voltage (230V) that sort of acts like an "AND NOT" gate.
All I have at the moment is three copper wires and some connectors. Obviously, when I just connect them, I'll get power on C when A or B are powered.
What I need ... |
H: LiPo charger with LDO regulator
I have ATmega328P circuit that drains from 0.1 to max 150 mA. Most of the time it's asleep (0.1 mA - with other little components attached) and once a minute it wakes up and drains 80 mA && occasional user input can increase drain up to 150 mA. So drain isn't constant, but most of th... |
H: Digital code of the high reference voltage of an A/D of a microcontroller
I know in theory that the digital code of \$n\$ ones (the digital code for \$V_{DD}\$) is equal to \$2^n - 1\$.
For example, the code 111 is equal to \$2^3 - 1\$ when \$n=3\$. This is because
$$
1*2^2 + 1*2^1 + 1*2^0 = 2^3 - 1
$$
Why does t... |
H: Is \$f_{\text{hfe}}\$ independent of BJT capacitances?
Bipolar junction transistors (BJTs) exhibit a gain rolloff as a function of frequency known as \$f_{\text{hfe}}\$, closely related to the device's transition frequency, \$f_T\$. As I understand it, this phenomenon is related to the transit time of carriers thro... |
H: piezoelectricity
By knowing some of the features of piezoelectric sensor, I want to know more about this sensor. how does it actually works? Does it require application of pressure and releasing that pressure often to generate electricity? Or can a constant pressure on that sensor generates electricity?
I want to... |
H: Ramp current in inductor
When DC voltage is applied across an inductor, would the current through it be ramp? According to voltage current relationship in an inductor, the current should be ramp if voltage across inductor is constant.
Is this practically possible only when there is no resistance connected in seri... |
H: Arbitrary direction of current Kirchhoff's Current Law
In the circuit shown, polarity across the top resistor is given. The question asks the value of \$V_0\$.
The answer given is \$-11.905 V\$. The answer can be found by assuming the current flows as the direction indicated in the diagram below, and after applyin... |
H: Why is the output of a series LC circuit sinusoidal?
How to analyze this circuit? Why is the voltage across the inductor(red plot) and capacitor(green plot) sinusoidal?
AI: Sinusoidal varying output for this circuit is something I can't
understand
Consider a large flywheel connected to a non rotating motor via a... |
H: Does someone have a non-textbook analogy to explain elements of a circuit?
I was wondering if someone could explain with analogies what inductors, capacitors, transistors, diodes, and op amps do?
I understand the basic idea; I'm currently an Electrical Engineering student. I already know the textbook definitions, b... |
H: DC Barrel + Battery schematic
I would like to create a power supply for a learning project, using either a DC adapter or a 9v battery.
I've read a few topics here and on the web about barrel connectors, but I'm still not sure how to use it properly in conjunction with a battery.
The schematics and articles I found ... |
H: Can I create a multiplexed array of IR photodiodes?
I'd like to use an Arduino to read from a large number of IR photodiodes. I have seen this question: How to Use SFH235 IR Photodiode Correctly? and would like to use a similar technique to the circuit on the left:
However, I'm not just trying to read from one pho... |
H: What is the meaning of this drill notation on datasheet PCB drawing?
Drawing the land pattern for a through hole part and am seeing this extra information below the main hole diameter (and tolerance):
For example, let's look at the one drawn right below the LED symbol (this is for a RJ45 connector with embedded st... |
H: How do the voltage of DC voltage sources and capacitors add up in series
I can't quite get my head around how the voltage adds up in a series circuit. Not the mathematics, I mean, but the reason down to the charge on plates and the actions inside the battery.
Also, if I were to charge two capacitors separately from... |
H: Is a Type 2a PID(ish) controller just an example of an augmenting integrator?
In a previous question I finally cracked the code on deriving for myself the transfer function for a Type 2(a) compensator like this one, built around an op amp.
As it turns out, for AC analysis purposes, that configuration is exactly li... |
H: Building a SDRAM Controller (VHDL)
I am using the Spartan SP601 Evaluation Board, which includes 1 GB Elpida EDE1116ACBG-8E-E SDRAM. I would like to build a RAM controller, but have no experience in working with RAM before. I largely based my design on a RAM controller in a textbook for Spartan-3 devices. I provide... |
H: Power's relationship to Resistance
$$ \frac{V^2}{R} = P = I^2 \cdot R $$
According to this equation, Power is inversely proportional to resistance on the left side and directly proportional to resistance on the right side.
How can power be both inversely AND directly proportional to resistance?
Looking for more o... |
H: Purpose of a resistor at the input of a linear regulator
I am working on a circuit that uses a LT3080 linear regulator to create an output Voltage of 15VDC from a 28VDC source supplying a load that draws about 200mA. Based on the datasheet, the output voltage is set by connecting a resistor (R1) to the SET pin acco... |
H: Resistance of an LED in a simple battery-resistor-LED circuit?
I have a simple circuit arrangement of a 9V battery - 1k Ohm resistor - LED. This circuit has a current of 7.5 mA (measured between the LED and the battery). If there's voltage drop of 2V in the LED, does it mean that my LED has a (2 % 7.5)k Ohm resista... |
H: Need Help With OpAmp Circuit for Cell Phone Recording
I'm trying to make a simple circuit that will allow for the combining and recording of both sides of the conversation by tapping into the connection between a cell phone and a headset.
For convenience sake, I want to also use a spare cell phone as the recording ... |
H: How does this Op-Amp Circuit Work?
I am analyzing the schematic for an audio amp:
https://www.sparkfun.com/datasheets/Kits/STA540%20Audio%20Amp%20v11.pdf
I am interested only in the top left op-amp (JP2 on the left) where it runs into the op-amp, pictured below.
A few simple things that I don't understand.
Why is... |
H: What is the diffrences between Bitwise operations in terms of memory consumption, performance?
If I have two input, for example:
a= 0110
b = 1010
which one is better (in terms of memory consumption, performance):
x = a (XOR) b
x = a (AND) b
x = a (OR) b
And why?
AI: In general, these will all be the same (take the ... |
H: What performance requirements are implied by the term "telecom applications"?
I've noticed the term telecom applications or just telecom in a few datasheets I've come across, and in the book I'm working through, the phrase "In high-speed dc-dc switchers for the telecom market ..." appears.
What kind of requirements... |
H: Is it compulsory to use ext oscillator in designing arduino circuit?
I am designing a circuit for arduino. I will be using Atmega328p, and will connect few male header for pin access and 6 male headers for programming (MOSI,MISO,SCK,RST,Vcc,GND). So is it compulsory to use ext oscillator. I know MCU can also work u... |
H: How to achieve very accurate/fine rotation with motor
I am running an experiment where I need to rotate a lightweight dial (<5 grams, so very low torque requirement, and fairly slowly), but need to do very accurate, fine steps of 0.03 degrees.
Something like this (shown as direct-drive here, but I'm open to other o... |
H: Raspberry PI power supply switched with FET
In my circuit there is a microcontroller, that can turn on and off the Raspberry PI power soruce. The schematic is following:
A microcontroller GPIO is connected to RP_SW and 5v_Raspberry is the power supply of the Raspberry. The Q9 FET and DT_1 transistors with R65 and ... |
H: FPGA doesn't seem to work the way I imagined
A couple of years ago I read an interesting Wikipedia article about something called a "field-programmable gate array". The article made it sound like it's a box of logic gets which you can arbitrarily wire together to implement any kind of logic you want (but without ne... |
H: 9v Batteries in Parallel?
I am creating a circuit with a 9v battery as its power source. For the sake of extended hours of usage, would it work to put another 9v battery in parallel, since placing it in series would make the supply 18v, which is too far away from 5v for the 7805 to deal with.
Bottom line, would it ... |
H: Mixing audio in a microprocessor
I need to do a project where I mix up to 8 to 10 audio channels together to play through a speaker. This needs to be done on a low cost microcontroller such as an ARM cortex M0 and I am thinking about how to do it.
The audio will be placed in an SPI FLASH memory chip in raw mono fo... |
H: Four layer PCB, leaks current on edges
I was testing a four-layer PCB and got electric shocks several times when trying to touch the edges of the PCB. The four layers are: top/+15V/ground/bottom layer.
It seems that there are several "white spots" on the edges. And is it possible that the +15 layer get exposed and... |
H: Conventional way to manage and use the libraries in Altium
I guess I have been always doing it wrong way because I don't have to use Altium so often. Whenever I start a project I create a schematic library (*.schlib) and a PCB library (*pcblib). And then I copy the symbols and footprints from other projects if avai... |
H: When does the NMOS form the channel? VGS > VTH or VGB > VTH?
When does the NMOS form the channel? VGS > VTH or VGB > VTH?
I see that textbook talks about VGS > VTH, channel formed, but the capacitor is formed between the gate and the body, so i think it should be VGB >VTH?
AI: When does the NMOS form the channel?... |
H: Feasibility of 10MHz, 100dB Dynamic Range Transimpedance Amplifier
I've been asked to produce a photodiode transimpedance amplifier with a 10MHz bandwidth. Current range of 1 nA to 100 uA (5 decades current) -> 100dB Dynamic Range.
Photodiode is a Silicon APD with junction capacitance 6pF.
Logarithmic compression i... |
H: ADC Multiplexer
I am working with a microcontroller with 8-channel, 10 bit multiplexer A/D converter.
In the manual it says:
When a sequence consists of multiple samples, the samples may be taken from one channel or multiple channels. An interrupt may be generated on the completion of an A/D conversion.
The analo... |
H: 24V ceramic heater to work on 12V?
I have a 40W ceramic heater, which needs to work with 24V but I only have a 12V power supply.
Will the heater work with 12V?
AI: Yes, but it'll only use a quarter of the power (10 watts) and put out a quarter of the heat.
Per Ohm's law, V=IR, with half the voltage, I'll draw half ... |
H: Are too high capacitance capacitors "bad" for the circuit?
I am trying to learn basic circuitry and I've been looking into capacitors and their uses in different areas.
When looking at capacitance several different sources say that circuits might malfunction or burn with higher capacity capacitors than designed wi... |
H: How to concatenate unsized parameters
My verilog module is instantiated in a VHDL top entity. I want to pass integer design-time configurations to the verilog module. These are the initial configurations that should appear at reset.
module abcmod
#(
parameter [23:0] VT_PARAM1 = 1280,
parameter [7:0]... |
H: Detecting battery degradation in voltage profile.
I'm measuring the voltage of a battery and a capacitor over time. Both components are charged and discharged daily. I don't have a background in electronics. When the components eventually begin to degrade or fail would this be visible in the voltage profile? Thanks... |
H: How to route power in split-plane layout?
I'm working on a sensitive analog measurement board. The design currently has split ground planes for analog and digital which are tied under the ADCs, as described in Analog Devices note MT-031. There are several ADCs. While this seems like a good way to handle ground, ... |
H: Heatsink surface temperature
This question is related to who knows how to design a thermal management. I started learn to do this, at hobbyst level.
So, this is the assumption of the situation:
When someone design the thermal handling of an electronic component (let's say an average IC), briefly its starts from the... |
H: Simple Analogy for Impedance and Load?
Can someone explain what impedance and load really are?
I have a textbook in front of me and I have taken and passed the EE class on it, but aside from a textbook definition I can't seem to get a really clear grasp on it. I can read the textbook all I want but I wish there wa... |
H: How can I pass a 10 bit value to a module that needs a 12 bit input in verilog?
I have a module declared as:
module bin2BCD(
input [11:0] bin12_in],
output reg [3:0] thousands,
output reg [3:0] hundreds,
output reg [3:0] tens,
output reg [3:0] ones,
);
I have another module which generates a 10... |
H: Representation/Effect of a delay element in the frequency domain?
If I have a simple RC low pass filter in which the output is taken across the capacitor, with a particular cut off frequency say x Hz.
Now if I were to introduce a delay in the path of the resistor, how will the bandwidth of the LPF change? How do I... |
H: What makes TPM chip Endorsement Key Non-migratable?
I know that the endorsement key (EK) of TPM is stored in non-volatile memory (e.g. EEPROM), which is non-migratable to ouside the TPM. The Storage Root Key (SRK) is also non-migratable.
What makes them non-migratable? It is achieved by protective code or the desig... |
H: MCU - What's going to happen if I put a PWM output pin right next to a bunch of ADC input pins?
I'm currently considering a MCU-driven circuit that will do a variety of things, including drive some BLDC motors and do some analog sensing (of position sensors, temperatures and the like).
The designers of the chip I'd... |
H: Mosfet with capacitor across the load?
I'm designing this general purpose mosfet controlled output, and I'm used to putting D1 due to possibly inductive loads.
However I was looking into some other implementations and this guy suggests putting a shunt capacitor (C24 in my schematic) to deal with some ringing when ... |
H: What are these coils on transmission lines?
What are these coils?
This was asked by doetoe in this physics.stackexchange Question
Where I saw them (maybe six or eight pairs) they came in pairs, always on the same two lines, and they were at approximately regular intervals.
It is from Spain, Barcelona area
AI: Its... |
H: Modelling a phase shift signal that is delayed
The exor gate measures the phase shift between two clock signals.
Let's say the phase shift is (phi) 0. I can write (phi) 0= (omega)w*t.
Now if I were to add a delay block after the exor, I would get (omega)w * (t+td) where td is the delay. So, (omega)w*(t+td)= (omeg... |
H: SATA over unshielded cable
I need to connect a SATA device to a development board which does not have a dedicated SATA connector but exposes SATA over a common 2x30 female header instead. My question is what cabling do I need for short length (say 15 cm)? Do I need to bother with cable shielding or is it possible t... |
H: Effect of rectifier input frequency on output voltage
Does changing the input frequency of a transformer rectifier change the output voltage, given that the input voltage is constant with no voltage regulator or protection circuit on the output?
AI: Assuming all components are perfect, and there are no other compon... |
H: MOSFET Leakage current
I tried this circuit with a power LED, without gate resistor and with \$R_s=4.7\Omega\$:
I discovered that when the Vin+ is at GND, there is still some leakage current which keeps the LED ON very dimly.
Edit: the implemented final circuit is this one
I discovered that when should be OFF, th... |
H: What will happen in theory if a 240V single-phase AC motor is run on 120V?
The motor is a A.O Smith Century 56-Frame Two-Speed motor. It runs on 240V single-phase. Here's the only reference I found (PDF), search for B2235.
If such a motor would be hooked to a 120V circuit, would it develop enough torque to start? W... |
H: Memory addressing with hex
If we have generic memory component that is \$2^{16}\times8 = 524288\$ Bits wide and CPU that that has address bus that is \$17\$ Bits wide. How could I locate this memory to begin from address \$ 10000 \$ (hexadecimal "Hex") and what is the corresponding end address? Could somebody provi... |
H: LM324 instead of LTC6081 for thermocouple
I have circuit schematic with LTC6081 for thermocouple, but LTC6081 isn't available in my country. Can I use LM324 instead of LTC6081?
AI: Maybe, but it will probably not perform as good. As the datasheet of the LT1025 tells us in "Amplifier considerations":
Thermocouple a... |
H: Understanding the summing-point constraint
I can't find any source online which explains this in a different way from the others. I'd like to think I'm not just being slow, but it seems that I might be just that, regarding the op-amplifier.
So the summing-point constraint claims that \$x\rightarrow 0\$, if we assu... |
H: Operational Amplificator Association effect on Slew Rate
I am designing a circuit which means getting sinusoidal signal as as Input and pass it to an ADC.
Since the ADC supports tensions from 0V to 5V and my input 5Vpp, then I need to escalate it properly (to 2.5Vpp)then shift it 2.5V
My first thought was the foll... |
H: Find the right motor to lift a robot's arm
I'm trying to find the right DC motor to lift a robot's arm.
I know the total weight of the arm, its length, and its center of mass.
The motor only needs to lift the arm up about 45deg.
How exactly I calculate and find a proper motor for these requirements.
Is there more d... |
H: Powering a WS2812B strip
After always being interested in learning more about electronics, I figured LED-strips would be a great start.
I'd like to power a 4 meter WS2812B-LED-strip (60 LEDs/m). These run on 5V and draw about 60mA per LED. That's 14.5A, or 75W. However, I've yet to find any power supplies for these... |
H: Power effeciency of Zener diode regulator
How to calculate the power efficiency of zener diode regulator?
Is it correct to calculate it as the ratio of power delivered to load to the total power drawn from input source?
If I am correct, would the efficiency of circuit shown in the schematic below is 0.5% ?
EDIT
Th... |
H: If my electronics are outdoors in a ventillated NEMA 4 enclosure, should I conformal coat my circuit boards?
I'm considering putting a circuit board in a ventilated NEMA 4 enclosure outdoors. I'm a little concerned about humidity and condensation inside the enclosure. Do I need to conformal coat my circuit boards, ... |
H: Determining Resistor for Heating Element
I am attempting to run a Molybdenum heat coil. The best I can tell it is 0.3-0.4 ohms per rack and I would like to run say two racks at 230V at 3.9KW (so it doesn't trip my 230V 20 amp breaker).
Does that mean, assuming a value for two racks is a total of 0.8 ohms, can I add... |
H: Difference between Zero speed and Near zero speed geartooth sensor
I would like to ask what is practical difference between geartooth speed sensor which is able to detect zero speed and near zero speed movements.
What is zero speed in this case?
Thanx
AI: Zero speed is 'what position is the gear wheel in now?' You ... |
H: Puzzle: Controlling two lamps with one SPST switch (AC)
This is the text of the problem:
Draw a circuit with two lamps & one SPST switch.
The lamps must be in opposite states.
New parts are disallowed to add to the circuit, but there is no limit on the type of lamps. We can't replace lamps with LEDs.
AI: Nothing ... |
H: Amplifing guitar signal in order to connect it to ADC
I would like to connect an electric guitar to ADC (or MCU internal ADC input) in order to process signal digitally. I'm not sure right now which MCU or ADC I'm going to use, nevertheless I believe that connecting a guitar to such input without amplification isn'... |
H: Will HD44780 display be hurt with 20mA on contrast pin? (pin 3)
I'm driving an LCD HD44780 display using my Raspberry Pi B+.
Using a GPIO pin I'm managing the contrast adjustment (pin n. 3) on my LCD display with PWM.
In the display datasheet, I tried to search something that talks about minimium resistor between t... |
H: How do compact AM radios establish a ground?
I am trying to construct a radio and, at the first stage, I have finally detected circuit a signal. My previous attempts have failed and I have discovered that it is because it was not properly grounded.
Originally I was using the ground from my oscilloscope, but it was... |
H: Signed and unsigned registers
What is it mean when the digital code of the output of an ADC is signed? Does it have to do with application? Does it mean that the corresponding output value that is calculated is negative?
AI: Depends on your ADC but usually, if it's signed then it means the value it sampled is negat... |
H: stm32 programming stm32 or beaglebone
I would like to program stm32f4 or possibly others from beaglebone (black) board.
Is it possible to load firmware over serial (uart) or somehow to the stm32?
Is it possible to use two stm32 , one for development other one for loading new firmware?
AI: The ST-Link is basically j... |
H: How to gradually light up an LED
With a circuit of a charged capacitor, a resistor, and an LED, I can create a lighten up LED that gradually dims until the capacitor run out of charge.
With a combination of a battery, capacitors, resistors, and LED, is it possible to create the opposite effect, that is an LED that ... |
H: Solving for \$v_{out}\$ in this circuit
Assuming ideal op-amplifiers, I did the following steps:
\$v_{out1}=v_1\frac{R_2}{R_1}=2v_1\$
\$v_{out2}=v_o=\left(\frac{v_{out1}}{R_3}+\frac{v_2}{R_4}\right)R_5=4v_1+2v_2\$
My textbook claims \$4v_1-2v_2\$
AI: These stages are inverting. Your equations are both missing a - i... |
H: What will be the time to charge a capacitor if there is no resistance?
A capacitor charges to 63% of the supply voltage that is charging it after one time period. After 5 time periods, a capacitor charges up to over 99% of its supply voltage. Therefore, it is safe to say that the time it takes for a capacitor to ch... |
H: Building an app using HTML CSS JavaScript on a touch compact device?
I'm a web developer who uses HTML/CSS/JS to write applications with awesome user interfaces using frameworks like reactjs and nodejs for browsers. I can build the same apps using the same code to create apps on desktop using Electron platform.
Wha... |
H: PIC12F509 Offsetting Program Memory Issue
I recently was experimenting with code protection on a PIC12F509 and noticed the program memory addresses under 0x40 were left readable. I confirmed this was normal when I looked at the datasheet.
So if a program is small and just extends to 0x39 it will be fully readable e... |
H: Interfacing RAM to a DIY computer
I am a relatively newbie to electronics but hopefully this question is not very non sensical:
I am following a guide to build a 8 bit computer. The guide requires a RAM which has a 4 address bit and 8 data bits. Unfortunately, the only RAM i have has 8 bit address and 8 bit data. A... |
H: Satellite detector and a mobile phone
A satellite dish with LNB connected to a satellite detector when powered by a 18v source could detect radio waves from satellites. I made one using the ppt here.
The detector, (when it was not connected to the LNB) detected the radio frequencies from my mobile, but as soon as ... |
H: What is an "origin pole"?
I'm studying Christophe Basso's book Designing Control Loops for Linear and
Switching Power Supplies.
In the book, he often uses the term "origin pole". This is what I think
I understand about it so far:
When a transfer function contains an "integrating" element, that element
represents a... |
H: SOT-23 NMOS transistor power dissipation
I am working on a design of a control system that controls a few small solenoids, each drawing about 200 mA of current and operating at 15-18 V. These solenoids are activated by NMOS transistors. Due to the size constraint that I have for the PCB containing these transistors... |
H: What power cord for 5V / 5A power supply
I am rather new to electrical engineering topics.
I am currently building an audio player with multiple components (Raspberry Pi, Amplifier, LEDs, etc.) that all need 5V and all together will never exceed 5 A (actually 4). That’s why I though about getting a RS-25-5 power su... |
H: Constant value required for VHDL array indexing?
I basically have a line like this in a vhdl code.
entity my_entity is
port(x : in std_logic_vector;
y : in std_logic_vector;
...);
end entity my_entity;
architecture arch of my_entity is
-- declarations...
signal delta : unsigned(...); --cor... |
H: How to properly charge a mobile phone?
Battery life is a critical aspect of mobile phones. I have a 4000mAh battery and I can use my phone without charging for even 2-3 days without internet.
But I have lost the charger that came with the phone, which is having a current rating of 2A. So I am concerned about the ... |
H: Ratiometric ADC and conversion algorithms
Let's assume that I want to measure temperature digitally with an MCU. The ADC of the MCU uses successive approximation to convert the analog voltage to digital and I get the 0s and 1s which are converted to digital codes and I can get the temperature from the digital codes... |
H: How does this power supply circuit work?
This is the circuit of a power supply with adjustable output voltage and current, and I wish to understand how it works:
What I did understand:
R1 T1 VD5 - they form a voltage divider which provides a voltage referrence that is applied through a voltage divider formed by R3... |
H: What sizes are detectable from 1m using a fairly good cmos camera?
I haven't ordered a CMOS camera module yet, but I am planning to use it to detect a small object from ~1-1.5 meters.
Just too be specific, say I am using the following CMOS camera (although if you know there is better with around the same price I'm... |
H: How many nibbles?
The question reads:
You know a byte is 8 bits. We call a 4 bit-quantity a nibble.If a byte-addressable memory has a 14-bit address, how many nibbles of storage are in this memory?
My answer:
Now I simply did the math and put down 3.5 nibbles; however, this is wrong according to the book which stat... |
H: How do corner vias in a QFN layout ensure stable operation?
In the picture below, from the recommended layout of the TGA-2513-SM:
there are via holes in the four corners of the QFN package. The datasheet claims that this "ensures stable operation". In what sense? There are plenty of thermal vias under the pad whi... |
H: how create a square signal between 0.2 volt and 0.8 volt
i am working on a signal comparator. I want to create a signal output of 0.2 volt if the input is under reference value and 0.8 volt if the input is over the reference. I am doing it with an arduino and usign a poteciometer to change the reference between 0.... |
H: How would you increase voltage to drive an LED yet also keep it limited?
I have somewhat of a special situation. I have a telephone system at the performing arts center I work at, and I need to make some of the phones flash an LED with no audible ring. My predecessor came up with a way and did this on two of the ph... |
H: LiFePO4 lithium iron-phosphate cells - OK to dip?
I want to try epoxy-dipping a PCB with an 18650-sized LiFePO4 cell. This is for a low-power application and is slow-charged, so thermal is a non-issue. Before doing anything unforeseen dangerous, is this cell type "sealed" or otherwise safe to dip?
From my understan... |
H: Transfer function for this transconductance op-amplifier
I used the summing-point constraint and KVL to get \$V_{R_1<<}=V_{\text{in}}\$. Followed by a voltage divider for the node left of \$R_L\$; yielding:
$$V_{R_1<<}=V_{\text{in}}=V_o\left(\frac{R_1}{R_1+R_2}\right)^2\iff\frac{V_o}{V_{\text{in}}}=\frac{(R_1+R_2)... |
H: 8-pin IC chip memory
I am trying to figure out what is wrong with a medical laser. My client has a laser which shipped with some default values.
At the moment when we query the values they are totally different from what we expect.
Two parameters are off. Value A should be 3000, it is 0 and Value B should be 0, it... |
H: Why can't I print integer using Nios?
So, my goal is to print (on the standard output) a number using a Nios II system on a FPGA Cyclone II Altera.
MY STEPS:
1) I created the following Nios II system with the Qsys tool (Quartus II):
(NIOS II CPU - JTAG - ONCHIP MEMORY RAM - SYS ID)
2) I wrote the following C code:... |
H: Long range RFID
Do you know which technology can have better range with and without battery assitance than RFID?
This is for a school project, we are looking for ways to detect crab traps lost in the sea.
We thought on passive RFID but then found it has a very small range.
Thanks
AI: By and large, RF (particularly ... |
H: Understanding power rating of switches at 5V
I have a hard time selecting a switch for my 5V project (somewhat of a newbie to the field). I would like to power a LED strip that consumes up to 1.2A at 5V. A typical load is usually lower at about 600mA at 5V.
I have come across some nice switches such as this one. Wh... |
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