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Results tagged with operational-amplifier
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user 158664
Questions relating to the construction and applications of operational amplifiers, which are DC-coupled, high-gain electronic voltage amplifiers with a differential input and, usually, a single-ended output.
0
votes
1
answer
903
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How to change/calculate frequency of this oscillator circuit?
I stumbled on this circuit (PDF, redrawn below), built it on a breadboard and bingo - works like a charm with a nice 1.0053kHz sine wave on the output. A little noisy given the breadboard, but satisfy …
- 672
0
votes
3
answers
3k
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LM386 amplifier buzz when not connected to signal
I've set up a simple LM386 amplifier on a breadboard according to the above schematic. When connected, the amplifier works like a charm driving a spare 8Ω speaker with impressively low (audible) noi …
- 672
4
votes
1
answer
3k
views
Identifying components in a headphone amplifier circuit
As part of furthering my understanding of opamps and audio electronics, I put this headphone amplifier together on a breadboard. Only one channel shown:
The circuit works like a charm, and is based …
- 672
0
votes
1
answer
644
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Arduino controlled audio amplifier gain?
I've building a preamplifier that also functions as a headphone amplifier.
When no headphones are present, the gain of the internal opamps should be 1x (unity), so that the signal can be passed out …
- 672