Amp With LDRs?

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MyKart

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Amp With LDRs?
« on: 14 Sep 2021, 12:03 pm »
Morten,
I’m just wondering if it would be possible/practical/in-the-cards to make an amp with LDRs?  :popcorn:

tortugaranger

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Re: Amp With LDRs?
« Reply #1 on: 14 Sep 2021, 12:50 pm »
Morten,
I’m just wondering if it would be possible/practical/in-the-cards to make an amp with LDRs?  :popcorn:

Not something I've ever seriously considered and for good reason. Variable resistors (LDRs are voltage/current controlled variable resistors) are not something you see used in amp design. I suppose they could be used if your goal is to have adjustable gain but that's a feature looking for a problem to solve. If the purpose of an amp is to turn lower voltage signals into higher voltage signals then you need devices and architectures that can amplify (i.e. increase ) voltage. I don't see LDRs playing a leading role in amplification per se.

The one exception might be in an integrated amplifier but then you actually have an amp with its own built-in preamplifier/volume controller where LDRs could be used but then again that wouldn't strictly speaking be using LDRs in designing/implementing the amp proper.