LM3900 Rectangular Oscillator (CB25179E)

This 1 kHz oscillator uses a Norton LM3900 operating system. The frequency depends on C1 and R1 and can be changed.

Water Pump Intelligent Control (CB17397E)
In this 2002 circuit, we have the activation when the reservoir is empty and shutdown when full....
Zener Identifier Tester (CB17431E)
This circuit was found in a 2001 documentation. It is a test of zener diodes that uses a voltmeter or...
Adjustable power supply CA3140 (CB25232E)
The output current is of the order of 100 mA maximum, but the transistor used can be changed for...