This circuit provides an audible signal when testing a TTL circuit. The circuit is from an old documentation, being fed with the 5V of the circuit under test.
This circuit has been found in an old documentation, but can be used as input shield for current...
This circuit generates signals from 0.01 Hz to 10 kHz, but uses unusual components today. The...
This circuit was found in the June 1969 issue of Radio Electronics magazine. The circuit uses a...