This circuit is from a Radio Electronics magazine from May 1986. Observe the voltages applied to the capacitors, taking care that the capacitor under test can withstand them.
This basic circuit was found in the March 1998 issue of Electronics Now magazine. The circuit is...
This buzzer trigger can be used for small alarms. We find it in an 80’s American documentation. The...
This simple circuit was obtained from Popular Electronics in December 1990. The magazine no longer...