Alarm tone generator (CB8445E)

Found in a documentation from the 90's, this circuit already includes an amplification stage. The 12 V power supply allows its use in the car.

| Clique na imagem para ampliar |

High Speed Optocoupler (CB23595E)
This circuit is suggested by Motorola, using a 4N26 type coupler and an MC1733 type operative. However,...
Old RIAA Equalizer (CB1375E)
This circuit is from a Japanese magazine of 1973. The circuit is designed to withdraw the power...
Relay Oscillator (CB25723E)
This low-frequency relay oscillator was obtained from an article in Electronics Now magazine in...