Mini Megaphone (CB8952E)

Found in Popular Electronics' 90s, this small megaphone is based on LM386. The circuit uses a high impedance microphone.

Root difference (CB21036E)
To be used in analog computing, this circuit outputs the difference between the values of the...
Peak detector (CB9689E)
This detector with ultra-low deviation was found in an American documentation from the 90s....
Crystal Oscillator (CB25445E)
This 1 MHz oscillator was found in the February 1992 issue of Radio Electronics magazine. The...