Found in an American magazine from 1968, this circuit produces pulses free of bounces on its output. The integrated is of DTL logic, no longer used today.
Found in a 1980s American documentation, this circuit has a current consumption of only 1 mA. The...
This audio millivoltmeter was found in a 1992 publication. It can still be assembled, as the...
This very simple continuity tester uses a small 1.5 V lamp (type used in flashlights). Can be...