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 uses a 741 operational amplifier that must be powered by a symmetrical source of 6 to...
This adjustable oscillator has the traditional configuration already presented in other articles. The...
In the figure below we have the main configurations of power supplies with the most used...