Circuit for piezoelectric transducer (CB8968E)

This buzzer trigger can be used for small alarms. We find it in an 80’s American documentation. The supply can be done with voltages from 3 to 18 V.

| Clique na imagem para ampliar |

Triac Three Phase Motor Control (CB4261E)
In the figure we have the way to make the three-phase control of a motor using opto-diacs. The circuit is...
Transistor Test (CB22567E)
This circuit for testing the voltage gain of a transistor was found in the March 1953 issue of...
Insect repellent (CB8102E)
This circuit was found in a PE Hobbyst Handbook from 1992. The second oscillator is a VFO. The...