Found in American documentation from the 1980s, this circuit makes use of components of the time, which are uncommon today. The circuit detects the approach using a sensor formed by metal plates.
This oscillator with emitter follower was found in an American documentation from the 80's. The...
The buffered phase shift oscillator circuit shown in the figure oscillates at a frequency of 2.9...
The original purpose of this 1963’ circuit from a magazine is to replace the mechanical vibrators used...