Unanswered Questions
867 questions with no upvoted or accepted answers
5
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0
answers
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Detection of CT secondary subsidence current
In utility power system protection we have a protection function called "breaker failure" protection. This protection is used to take appropriate action if/when a circuit breaker fails to ...
- 3,497
4
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0
answers
78
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RF circuit/component to generate a chirped waveform (from 0.5 GHz to 1.5 GHz) over 100 ns
I need to generate a 1 GHz bandwidth chirped pulse, 100 ns long. In the past, I have done this using fast arbitrary waveform generators (Keysight M8195A), but this is an expensive and very general ...
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4
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214
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Need help to identify an unmarked SOT23-5 IC
I have come across a PCB which is a vibration sensor (switch) based motion detection logic, where on any vibration is detected, the circuit will turn on/off a load. It works in same way as a Push ...
- 91
4
votes
0
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190
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Review of electric circuit with Arduino
I am currently working on a project for which I am in charge of the electronic circuit. Since I have never worked with electronics before, I am really desperate and unsure whether what I am doing is ...
Null♦
- 7,623
4
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0
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743
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D-Class Amplifier Design Verification
I have an internship coming up working with comparators and amplifiers, so I wanted to take on a side project involving both of those components. Designing a D-Class amplifier seemed like a great way ...
- 2,359
3
votes
0
answers
104
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How to interface buzzer with LED in this circuit
Below is the circuit where I want to integrate the buzzer with the red LED.
The task is to add the buzzer, where the red LED is, in such a way that when the red LED (which is driven by the LED driver)...
- 31
3
votes
0
answers
82
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Help with heated differential pair design
So I'm currently designing a VCO and need an exponential voltage-controlled current source. I'm following the basic idea of biasing one side of an NPN differential pair. However, I've seen that for ...
- 36k
3
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0
answers
69
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Minimum circuitry for robust operation of the "new" ATtinys (1614) with Optiboot
I have spent hours now trying to catch up on the replacements for the old ATtiny's, there does not seem to be a robust (meaning, with protections that we could find in an UNO or Mega for example) ...
- 9,270
3
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0
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689
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Does this ESP32-WROOM-32E programming circuit work?
I am a newbie in electronics design. Currently I am working on a project involving an ESP32-WROOM-32E being powered by a LIPO battery, receiving data, and displaying the data on an OLED. I have ...
- 31
3
votes
0
answers
258
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What are the determining factors for using a polyfuse in electronics circuit design?
When designing electronic circuits (PCBs) I often wonder if I should use a polyfuse (aka polyswitch, PPTC, PTC resettable fuse) at the power inputs and outputs or not.
So basically what I am asking ...
3
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217
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ADS (Advanced Design System) Simulation to fit experimental data
I am a noob on ADS software. I was just wondering, if I have a given set of measurement data like the following:
And I know a equivalent RLC circuit model for my device, from literature. How do I ...
- 31
3
votes
1
answer
534
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Where does the 1 V voltage come from?
I have a PLC with many digital open collector outputs connected similarly to the schematic below.
If I use a multimeter and measure the voltage between the two points in the schematic, it is showing 1 ...
CommunityBot
- 1
3
votes
0
answers
113
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Mux switching one leg of differential signal
I found the schematic below for a muxed thermocouple circuit from this web page. This circuit uses a mux to switch just one leg of the thermocouples. While I am sure that this works fine I have a ...
- 1
3
votes
0
answers
239
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RF signal Multiplier or Chopper
I'm trying to design a circuit that "multiplies" two signals.
I have an electrical unit with two separate circuits. One circuit drives the other one with a square signal. The width of the square ...
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3
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0
answers
129
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Is it OK to have flying leads on a differential pair?
I'm designing a small daughterboard that contains a microcontroller and a USB port. This board also has a connector to allow it to connect to a motherboard.
What I'd like to be able to do is to have ...
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