Found in Exar documentation from the 1980s, this circuit has a 60 dB cutoff at 1800 Hz. The circuit can be adapted to operate at other frequencies.
This simple diode test appears at other points in this section. Or circuit can be adapted to use...
Found in Electronics Now magazine in an issue from the 90s, this circuit is different from the...
This circuit inverts the phase of an audio signal, maintaining its intensity. The transistors can...