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Questions tagged [circuit-design]

a term to describe how a circuit should behaved based on accomplishing a particular task. When designing circuits, one should consider how it works, the target specifications, efficiency, cost effective, code compliant, and ethics.

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EPCQL controller

I am trying to access in read and write my EPCQL-1024 from simple soft running in NIOSII. I have the Altera Serial Flash Controller I configured in QUAD mode connected from its avl_csr and avl_mem to ...
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130 views

Make an LED (20 LEDs) circuit battery efficient

I want to wire up a miniature wargaming figurine to have 20 LEDs. As I've poked around options my concern is the battery life and how often the battery would need to be replaced. Since each gaming ...
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26 views

Design sequential circuit with 3 state buffer

I asked to design a sequential circuit with 3 state buffer so when : Load = 1 -> put data into output Load = 0 -> don't change output Here is my design: But question said also use other gates. Is ...
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1answer
84 views

How to reduce frequency of output signal? [on hold]

I am making a new circuit for energy harvester. The output power is about 100V and 100Hz signal. I want to get the 5V(or 3V) and 10Hz, with a minimum number of circuit components. Because the ...
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3answers
94 views

Power amplifier, does this circuit work?

I found that circuit for a power amplifier. Does it work? I want to build one for myself.
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2answers
25 views

How will the resistance of this Evaluation Module affect the measurements of the current produced by this photodiode?

A little context: This is part of a bigger project about glowing algae, my job is to design a photodiode array to measure the amount of light the algae produce in response to movement. I have a good ...
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4answers
99 views

Circuit to convert 24VAC digital signal to 5V DC digital signal

I am designing a circuit to convert 24VAC signal to 5V DC signal. The 24VAC signal is designed where 24VAC is on and 0VAC is off. The signal needs to be fed to an MCU which is 5V DC. The circuit ...
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20 views

Multisim Transient time point did not converge (peak detector circuit)

I'm building a peak detector circuit with mcp6002 op amp. The signal is 8k Hz 20%dc square wave filtered through a low pass filter whose capacitor varies between about 10pf to 1000pf. The schematic is ...
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1answer
54 views

Water sensing circuit?

I was learning about GFCI and wanted to know if there was any easy way to create a simple circuit to detect when there is water. What I would like to do is make a LED turn on if a component (whether ...
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19 views

High Voltage Supply with LT1308A

I am trying to build a circuit that outputs ~180V for a nixie watch using the LT1308A. I'm modifying the following circuit found in the datasheet on page 17: Now my circuit is essentially the same, ...
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13 views

mcp73831 is on and off

I am trying to design a circuit that will be fed by usb and a lipo battery with charging while usb is plugged. I have just built the fist sample, however mcp73831 seems not to be working as it should ...
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2answers
45 views

Bosch Glue Pen: Bypassing automatic timeout [on hold]

I have this Bosch hot glue pen. It has an annoying habit of turning itself off. I guess it's probably intended to be a safety feature or a battery saver, but really it's just a nuisance. Can I modify ...
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2answers
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Designing a circuit that opens when less than 12 volts are applied and closes when more than 12 are applied

I'm looking to build a circuit where current only flows when there is a potential difference across the entire circuit of more than 12 volts (+- 0.1 V). I also need there to be only a small amount of ...
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3answers
52 views

Is there a circuit that outputs high indefinitely once one high is received by the circuit? [duplicate]

Apologies if the question is worded oddly/weirdly, but specifically I have a comparator with an unstable output which I know could be fixed with hysteresis, but I would rather just have some circuit ...
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3answers
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Non electrical background trying to make a cool little custom project - Help please?

Brief bit of background - I've built my own PC's, I've repaired phones, changed plugs, fit light fittings from diy stores, and have a basic (very basic) understanding of electronics, but have found ...
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Calculate inductance of chokes for a induction heater

simulate this circuit – Schematic created using CircuitLab I´m trying to build an induction heater, I have builded four of them and only two worked, one of these blew up both IRFZ44N (first it ...
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1answer
284 views

Designing a sequence detector(0110)

I asked to design a sequence detector to detect 0110 and when this sequence happend turn it's output to 1 for 2 clock cycles. Here is what I designed: But the problem is it turns the output to 1, ...
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1answer
76 views

What happens if I switch C and R

Is there any difference if I switch places of R3 and C2? Impedance and frequency response remains same as I understand. Is there something else? Circuit source: https://www.circuitlib.com/index.php/...
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2answers
117 views

Multiple Step-Down Voltage Rails from a single DC Power Supply

I have one working PCB which has three different Voltage Rails: 3.3V, 4V and ...
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1answer
29 views

Relay for a 12V light bar

Here is what I'm trying to accomplish, let me know if it's possible and if so where I might find the parts. Thanks in advance for any help and advice you can give me. I'd like to wire up a LED ...
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1answer
26 views

Rocker switch & Electronic Relay switch circuit (240v)

I have an already existing circuit between the mains wall supply and a window shutter (see image), it has a gewiss rocker switch for opening and closing the shutter when you press and hold one of the ...
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22 views

DIY Electroencephalography (EEG) circuit

I'm interested in electroencephalography. I did a little cursory research on the subject and decided I'd like to try my hand at building my own cost-effective EEG sensor apparatus. There are a few ...
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Snubber maximum ratings

I'm developing a home automation system, and using a triac to power on/off some lights. My problem is that lights from other rooms when switched on/off are producing noise/spikes and flashing the ...
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1answer
393 views

Why is my transistor beta lower than expected?

I bought these transistors on digikey: BC549CTA Reading through the datasheet, (and on digikey's page), I am led to believe that the DC gain for this transistor is at minimum 420 [@ 2mA, 5V]. The ...
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1answer
48 views

How to design a simple current based class A amplifier

Very much along the lines of Class A single transistor amplifier with 2N3904, but with a current signal input. My circuit is a Zener noise source using the simplest of components. Traditional class ...
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3answers
694 views

If temperature is not an issue, what can be said about the different ceramic dielectrics

Let’s assume we have a circuit whose operating ambient temperature range is well-regulated to 25+-5C. Besides cost, what would be the use cases for the different ceramic dielectric types? In other ...
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2answers
88 views

Does this prototype match the schematic?

I'm following this project which shows how to make an OpenTherm Adapter for an Arduino. It includes this schematic: Along with this simplistic PCB diagram: I am now in the process of making my own ...
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Discrepancy between simulation and measurement for a voltage doubler/ rectifier design at 5.8 GHz

I am designing a pretty straight-forward voltage doubler at 5.8 GHz with MACOM's MA4E1317 diode, which I have used before and know from previous experience that matches pretty well with the spice ...
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2answers
87 views

How would I finish out this mini project (emitting 1 whenever 101 is read)?

Design a Moore finite state machine that detects 1 0 1 in consecutive digits in the input stream of 0's and 1's received every clock cycle. The circuit should output a 1 when it detects 1 0 1 ...
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1answer
81 views

Actual Accuracy of an ADC

I checked quite some ADC datasheets and am a bit confused regarding the actual achievable accuracy of an ADC. Let's take this ADC for this example (ADC MCP3422): http://ww1.microchip.com/downloads/en/...
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32 views

PLC Relay Output Circuit

Can someone help with this question? I've answered it to the best of my knowledge based on the learning materials provided but the answers I've gotten are exactly the same as the example. Should 5v be ...
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2answers
93 views

Why I got a minus output value?

When I simulate the circuit on (OrCad) I got an output voltage between (0 to 1) V changing with temperature . but when I connect the circuit I got the output voltage = -1.85 in minus and different ...
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57 views

PT100 sensor for measuring liquid resin, fully submerged

Edited Link to Pt100 sensor (That's the best i could do) https://www.intech.co.nz/products/temperature/mrh.html Link to ESP8266 datasheet http://www.handsontec.com/pdf_learn/esp8266-V10.pdf ...
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77 views

Figure of merit of Operational amplifier

How can I measure FOM(figure of merit) of an operational amplifier? There are so many parameters, how can I decide which formula to use while calculating FOM?
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36 views

How can I have different circuits relays based on a particular voltage input?

I want to build a circuit that is dependent on an input from a thermistor which is in a circuit that is a voltage divider. Now if the thermistor is showing low temperature, then I want to increase my ...
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5answers
140 views

Boolean circuit - 4 bits divisible by 3

I need to draw a circuit taking a number on 4 bits that will return 1 only if that number is divisible by 3. My initial steps were to draw a truth table from which I got a Boolean expression that ...
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0answers
74 views

Second Order Circuit, Sadiku's Fundamentals of Electric Circuits

I would like some help with Sadiku's exercise about second order circuits. I did'nt understand why the solution says that V (0) = -30 V. Also, I did not understand why the capacitor's voltage (Vc) ...
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40 views

LEDS on Traffic Circuit using 555 Timer Don't Light up

Here is a picture of the circuit and circuit we built on the breadboard. We used every component as instructed and built it as such. The Green LED lights up for about 7 seven seconds then turns off, ...
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1answer
132 views

How can I make the design simpler?

I have designed a circuit and it is working. However, I think it is too complicated and can be changed or simplified. I might be missing something. I am finding hard to create a 1 second delay. A ...
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1answer
2k views

Please help me understand the following light-controlled relay circuit

I used the following circuit to control the outdoor light, and it works as I wanted. I am trying to understand the circuit and it looks like a comparator circuit, but I don't understand the use of ...
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2answers
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How to simulate the exponential growth op-amp?

According to Wikipedia, the following is the exponential output operational amplifier. I would like to test this out in a simulated environment and see how this functions. For example give a sine ...
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2answers
4k views

Is it ok to 'snake' the flow of my schematic?

I recently watched this video by EEVblog on drawing schematics. One thing he talked extensively about was that the logical flow of a schematic should flow from left to right. Whilst this makes ...
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2answers
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Choosing the ground for circuit

Can the GND pin of the Arduino UNO be used as a ground instead of the negative terminal of a battery while using a battery as the power source? If no, do we have the liberty to choose our ground for ...
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2answers
105 views

A circuit to convert 4-bit Gray numbers to BCD

I'm sorry for asking this specific question here but can some one please tell me what's wrong with this solution. Question: design a circuit to convert 4bit Gray numbers to BCD I have to say I ...
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1answer
40 views

Simulate physical FM Transmitter circuit on Matlab Simulink

I am new to matlab. I was working on a simple modulator that I have to simulate. I've faced a problem with connecting the output frequency from the resonance circuit to the scope, A red dotted line ...
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2answers
37 views

Have separate instructions for each register or pass register as argument?

I am trying to design a (very) simple processor architecture. I am in the process of creating a basic instruction set for it, however I am not sure of the best ("best" meaning what most people use - ...
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Designing a +10 V -10 V +7 V DC power supply for audio equipment

I've recently purchased a tape recorder (Tascam Midistudio 644) that was very cheap because the previous owner had lost the power supply. The PS-M1 power supply that originally came with this unit is ...
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2answers
52 views

Correct Voltage Detection

I have ran into a problem where some USB supplies drop below 4.6 volts. Is there a circuit that would block the voltage below 4.7 volts and pass the voltage when it is above 4.7 volts. I have tried ...
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1answer
102 views

Amplifier with true ground output swing and A/D conversion

I want to amplify a 0-20mV signal from a sensor to 0-2.048V in order to feed it to an ADC (with a reference voltage of 2.048V). After I will input the digital signal to a microcontroller. I need to be ...