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 |

4046 Pulsing Alarm Sounder (CB25767E)
This circuit was found in the October 1994 issue of Electronics Now magazine. The 40446 IC is a...
30 kHz oscillator (CB8136E)
Found in a 1967 EEE, this circuit generates a constant amplitude signal, stabilized by a zener...
Debounced switch (CB24335E)
This circuit is from the November 1974 issue of Radio Electronics magazine. The capacitor...