Surge voltage generator (CB21465E)

Found in a 1967 US magazine this circuit generates positive and negative voltage pulses from a negative transition of the input signal.

| Clique na imagem para ampliar |

Overtone XTAL Oscillator (CB12703E)
To operate in a harmonic of the crystal frequency, tuned to a trimmer in the resonant circuit of...
40 W Amplifier LM1875 (CB6985E)
The integrated circuit used in this Electronics Now amplifier is not very common today. However,...
Resistive Loads Controller (CB20120S)
This old circuit, from the 80's, uses an integrated circuit that is uncommon today. The circuit is...