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 car turn signal circuit was found in the April 1969 issue of Radio Electronics magazine. The...
We found this small amplifier in a 1973 technical publication. The critical components are the...
We found this circuit in a Radio Electronics from October 1960. The circuit uses just one...