Using an LDR as a sensor and an operational amplifier this circuit was found in the Encyclopedia of Electronic Circuits volume 5 from 1995. The circuit triggers an optodiac.
The purpose of this 1967 Philips circuit is to produce a rectangular signal from a sharp pulse....
This circuit allows you to read capacitances on a common analog instrument. It is part of an...
The idea of this circuit is to use an AM radio with headphones to receive sound signals...