Found in an Elektor from the 90s, this circuit is suitable for viewing audio signals on an oscilloscope. The operational amplifier admits equivalent.
This circuit is very useful for the experimenter who may have his power supply damaged in the...
This circuit uses one of the first comercial transistor and is from a 1958’s magazine. Tone...
Suggested by National Semiconductor in documentation from the 90s, this circuit makes use of an...