Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [trimmer]

17 questions
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Any possibility of dead short in trim pot

I want to add one trimpot of 1K in my ADC board to test several analog channels. I thought of connecting two ends to VCC and GND and middle pin (wiper) to analog input. But I am not sure if I need to add any additional resistor on one of the sides…
Rajesh
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Is a resistor trimmer a good idea for adjusting the gain of an op amp circuit?

I'm designing this circuit to measure temperature with PT100. R10 must be calibrated to obtain the desired gain. I have thought of using a resistor trimmer to adjust the gain similar to the following: Considering that the humidity and temperature…
Fabián Romo
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Proper or instinctive design choices for trimpot direction

We all know its customary for a VOLUME control on any audio product should require turning CW to make it louder. In fact for user accessible rotary adjustments, clockwise almost universally means "more". This despite the fact that all plumbing…
Randy
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How to adapt a FM reciever circuit to use a varicap diode instead of a trimmer capacitor

My team and I are interested in learning about FM communication and decided to build a simple FM receiver before building a proper transmitter. We looked at some circuits on the web, and they all seem very similar. The problem is that these circuits…
Candy Hi
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Bottom-adjust vs top-adjust variable capacitors: When would you use one vs the other for RF filters?

I was looking for some trimcaps and found these on Digikey which have a "Top Adjust" and a "Bottom Adjust" version. Here's an image from the datasheet: Besides mechanical access, is there a reason you would prefer one over the other? For example,…
KJ7LNW
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Power Supply Module Internal Trimmer circuit / Remote Programming Resistor Value?

I am looking to incorporate a 45V supply into a design. These PFE1000-48V supplies have a trimming ability to get +/- 20%, based on +/- 20% variable resistor. I am trying to confirm what this resistor value should be. If 45V is 93.75% of 48V. So the…
nk13
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Old potentiometer as a special voltage divider model

In an Adruino-like project that is built to deal with worn potentiometers (trimmer pots inside thumbstick, of alps alpine type), I am noticing a consistent set of input reading patterns among all old, overused potentiometers. The patternis best…
Physician
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What would be the ADC reading of a potentiometer whose wiper fails to be in contact with the resistor?

This question is part of an Arduino-ESC project I am building from the software standpoint. Some essential hardware questions tend to pop up every now and then. I noticed electrical noises in old potentiometers' readings. They seem to be best…
Physician
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Missing component identification

I have a remote controller whose antenna is de-soldered and it seems there was a capacitor or a resistor (see red circle). Can anyone help me to understand what component could be the missing one? I thought a capacitor similar to others close but…
Leandro
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Cannot fine tune Colpitts oscillator with crystal

I'm trying to design a cheap video synthesizer. In order to do it, I need to provide my Arduino Nano with an external clock so it can drive the timer that generates the complex video pulses I need. What I wanted was to have the possibility to…
Dan Chelger
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Need help identifying and finding similar SMD variable resistor

The component appears to be damaged, but the datasheet for the board in question shows that this is a 47k ohm variable resistor. Looks like a trimmer, but not 100% sure. However, I've been trying to find a similar looking component with the same…
Nick U
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TZC3 capacitor restrict area underneath

I am going to use TZC3 family trimmer capacitors from Murata (datasheet, skip to TZC3 section). It has one of its terminals very close to the mounting surface, and theoretically if rotor is pressed too much (or device is overheated during soldering…
Anonymous
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replacing a 2k resistor with a 1k and trimmer - wiring

I have a question about wiring up a trimmer in this circuit (NE555 - piano module) I have no background in electronics so please bear with me. One of the keys in the 'piano' sounds just off tune, so I would like to change the sound of that button by…
iridian
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What's the proper name for "annular potentiometer"?

I'm looking for a potentiometer without the shaft. It should be like a ring, in annular shape, so it can be mounted on an existing shaft. I don't find anything, but I'm afraid I'm not using the proper English word to describe such a component.
Mark
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Combined temperature coefficient of LM741 and trimmer pot for null offset

I want to use a 10k trimmer pot with a 250ppm/°C tempco for offsetting input offset voltage of an LM741 op-amp. Cermet potentiometer temperature coefficients partially answers my question. And the following goes into great detail about why null…
Jodes
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