This circuit is intended to recover a very weak signal at a receiver, for example, a CW signal or a tone signal. The circuit is from a Popular Electronics from the 90s.
This circuit is intended to reinforce old car radios, having been found in 1997. At that time,...
This oscillator found in Electronics Now of the 90s is of the Normally-Off type, being triggered...
This circuit was found in a Popular Electronics of the 90s. The operational amplifier admits...