Sawtooth generator (CB21338E)

This op amp circuit is based on a 555 IC and two common op amps. Transistors are general purpose.

4 1 2 digit voltmeter TL501 and TL502 (CB16053E)
This circuit uses a 4 ½-digit indicator of the type TIL33oA (1 unit) and TIL321A (4 units). Driver...
Alarm Sensor (CB15000E)
The circuit shown consists of a NO and NC sensor system for alarms. The output must be connected to a...
Acoustic transmitter (CB8230E)
From a 90s Popular Electronics, this circuit emits pulsating signals for different types of...