Questions tagged [circuit-design]
The process of creating a circuit to accomplish a particular task. When designing a circuit, one should consider how it should work, the target specifications, efficiency, cost effectiveness, code compliance, and ethics.
4,842 questions
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Flame ionization detector 2 µA [closed]
I want to detect a flame using Flame ionization. But I don't know how to convert the 2 µA of current to a usable signal (24 V or more, digital). I have searched around the internet but all I could ...
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Li-ion charging + rails on small PCB (TP5100, XL4015, 2S BMS) — safest path without PCB rework?
I’m working on a piece of portable audio electronics and I’m running into some charging and power supply issues.
Project:
• Small 3-board build: power, signal (5 V), amp (needs ~9 V).
• Battery: 2 ...
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Construct a 32 x 8 RAM using 8 x 4 RAM chips [closed]
I have a problem in my book in the practice section that "construct a 32 x 8 RAM using 8 x 4 RAM chips." I know 32 x 8 RAM contains 8 output line and 5 input. So I need 8 RAM chips. But the ...
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Creating a boost circuit, 24 to 200 V for a solenoid
I am building a boost circuit which should boost from 24 V to 200 V to fire a solenoid to kick a ball. I have found the parts and put together the schematic and want to know of this would work and if ...
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TI UCx84x datasheet - possible error in the application schematic?
The UCx84x datasheet from TI: https://www.ti.com/lit/ds/symlink/uc2845.pdf, last updated in October 2024 at the time of writing, has the following application schematic, Figure 8-2:
The highlighted ...
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Push On Push Off circuit with Capacitive Load
This circuit is a push-on / push-off latching circuit. The device is battery powered, therefore the off-state current must be as low as possible. The circuit works in general, but it is unreliable: ...
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Car strobe unit PCB with 8 LEDs schematic check
I’m working on a circuit board for amber strobe units to be used in a car. Each board will feature eight individually addressable LEDs, controlled by an ATtiny microcontroller. In certain ...
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How to design a passive band reject filter using the second order Chebyshev topology to meet design specifications
The objective is to design a passive band-stop/band reject filter that flattens the sound pressure level (SPL) across 20-20e3 Hz while meeting specs:
f_resonant = 2000 Hz,
f_cutoff1 = 1561 Hz, ...
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Leak Sensor circuit Design
I am building a water leak detection sensor using some probes I found on the internet. I want to use a comparator to indicate when a leak has been detected (probes are shorted due to water contact). ...
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Invert output from PCF8574 using a SN74HC05N to drive a 2N7000
Circuit design using PCF8574, SN74HC05 and 2N7000
I (a hobbyist) would be glad if you can help me with following:
I want to switch multiple external relays. In lack of ports, I decided to use the ...
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Connecting two batteries in parallel
I am building a POC with two COM-15208 buck-boost boards (5V/3.3V from 3.7V LiPo). Daily draw: ~1825 mAh (~76 mA avg).
I have two 10000 mAh batteries available with me and I want to parallel two ...
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High-Frequency Sine Wave Amplifier Design - 600mVpp to 360Vpp (100 kHz - 1.1 MHz)
I'm designing a circuit to amplify a sine wave signal from 600mVpp to 360Vpp.
Frequency Range: 100 kHz to 1.1 MHz.
Total Voltage Gain: 360Vp-p / 0.6Vp-p = 600V/V.
Load: Primarily a 2pF capacitor.
...
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Transistors gain bias
My project requirement is that for a 10mV peak at a 30KHz signal, I need 2V peak(1% accuracy), DC offset < 20mV output with 10 ohm load. The component type we can use is limited(op07, 2SCR293P and ...
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How to learn how different components interact with each other?
I understand capacitors, diodes, resistors, transistors on a simple level, but for the life of me I can't figure out how or why they or what they do in a circuit.
I understand that capacitors hold ...
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How will current flow in this 120 Vdc circuit when various switches are closed? (homework)
Answer to 2 is D and to 4 is B. I'm having trouble understanding the logic behind these answers.
For Q2: How will closing switch #4 prevent lamp from lighting up? Wont current just flow through both ...
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Difficulty implementing differential output stage
I’ve developed an elliptical circuit followed by 3 op-amp stages. The final output needs to go into an LPC4370 ADC (can’t be changed), which requires a differential input (100 mV to 900 mV range). I ...
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First electronics project with actual PCB design. Can you help weed out any problems?
I would like to ask for your help directly—like spotting obvious, glaring problems that a newbie like me might make.
So, my idea is a door/locker controller based on two R503 fingerprint sensors with ...
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How to make the following circuit work?
The idea behind this circuit is simple - to light up the LED when there is darkness, thus, save electrical energy. However, LDR readings show small value of resistance (must be hundreds of thousands ...
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Combining differential high-pass Sallen-Key filter and differential amplifier into one op-amp stage?
This is a follow up of this question.
I'm building a low-noise differential preamp for measuring PSU output noise with an oscilloscope.
The design currently has three functional stages:
Differential ...
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Connecting UART (STM32F411) to a single wire Slave (Radiomaster Ranger Micro)
i want to connect my STM32F411 using UART to the Radiomaster Ranger Micro which has only one data pin.
Using asynchronous mode (UART using only TX) was no problem but now i want the mode to be half ...
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Designing a Short Circuit Detection and Continuity Check
I'm in the process of designing a test jig/test bench and would really appreciate your suggestions and guidance.
The main objectives are:
Detect short circuits between two points and provide a clear ...
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Microphone Analog Beamforming Circuit Questions
Summary
I've designed a beamforming circuit that uses two electret condenser microphones (ECMs) in a differential end-fire array and outputs to a bluetooth module's ADC for transmission.
I explain my ...
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Inductor---how long can the rated current be exceeded for?
I'm planning on building a HV supply for a CRT TV capable of generating ~7.5 kV at the output. Here is a diagram of the supply:
More details (and the original diagram) can be found here.. I have made ...
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How to power RGB LED Strip with ESP32-S3 microcontroller on breadboard?
I am trying to use my ESP32-S3-DevKitC-1 microcontroller to power RGB addressable LEDs via the ESP-IDF 5.5 Command Prompt, but I am not able to power on the LEDs. I have tested the microcontroller ...
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Which Non Inverting 3.3V to 24V Logic Level Shifter Method is Correct without using an IC?
Iam designing 3.3V to 24V Non Inverting Level Shifter by using NPN Transistor and P Channel Mosfet.
Input :
STM32 Microcontroller GPIO- 3.3V (High ,Low)
output :
24V , 24 mA (High low)to Drive an ...
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