A chopper-stabilised amplifier, from the Texas Instruments app note: Auto-zero amplifiers ease the design of high-precision circuits. The solution to the problem of poor op-amp DC noise ...

The humble op ... an audio power amplifier driving a small speaker. For the dedicated student of op-amps, may we suggest further reading as we examine the first integrated circuit op-amp?

One side of the LDR gets the audio ... of amp tremolo because most tremolo pedals are designed to emulate classic circuits. Some do so using valves, but most run on JFETs, transistors or op ...