This CMOS circuit was obtained in a 1980s documentation. The circuit has a 10-second time delay before firing. The transistor is a general-purpose type and power supply according to the relay.
Varicap or varactor is the basic component used in this circuit of an American 80's documentation. The...
This high-Q low-pass filter was found in the October 1990 issue of Radio Electronics magazine. The...
This single transistor shield was found in the October 1993 issue of Electronics Now magazine. The circuit...