Ultrasonic remote control transmitter (CB8397E)

Found in a 90s Popular Electronics, this circuit excites a 40 kHz ultrasonic transducer. The transistor can be a BD135 or other medium power.

| Clique na imagem para ampliar |

Single Pulse Trigger (CB23925E)
Using the 2N2646 this circuit was found in a Radio Electronics magazine from July 1968. The...
Buffer 4049 (CB26316E)
The purpose of this circuit found in a 1990s Popular Electronics is to increase the current...
Opto control for triac (CB20552E)
Found a documentation for PC from 1992, this circuit is indicated for the English power grid of...