Latching relay (CB25722E)

The figure shows how to connect a relay to obtain the latch effect. The circuit is from an Electronics Now from June 1994.

Strobe (CB6751E)
This circuit makes use of a stroboscopic tube, a component that no longer exists today. The...
9 to 25V x 100 mA regulator (CB8825E)
This small voltage regulator was found in a 1969 EEE. More powerful transistors can be used to...
Tone Control TL071 (CB14499E)
We have already presented this circuit, obtained from manuals from other manufacturers of the used...