This circuit uses three inverters to generate a rectangular signal whose frequency depends on R1 and C1. The circuit is from a March 1996 Electronics Now.
A safe way to obtain a sinusoidal signal of excellent quality and low frequency without the need...
Found in a Popular Electronics from the 90s, it applies to the old answering machines that used...
Loads up to 150 mA can be controlled with this circuit from a 1967 publication. PUTs can be...