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 circuit is from the time when cars used contact breakers. This 80's version measures the dwell...
Suggested by an old American documentation the circuit below keeps a battery charged and at the...
This circuit was obtained from a manual of the integrated circuit itself, but can be applied to...