Ultrasonic repellent 4011 (CB9385E)

This circuit was found in Radio Electronics from the 90s. The transducer is a tweeter and the power transistor must have a heatsink.

| Clique na imagem para ampliar |

Unijunction Proportional Control (CB16914E)
This circuit is from an old French publication. With it we can have full wave control of a charge...
Divider by 5 in second version (CB25364E)
This is an improved version of the previous circuit also found in the December 1990 Radio...
Wideband 4046 VCO (CB25247E)
This VCO with the 4046 PLL generates signals from 0 to 1.5 kHz. The circuit is from a Radio...