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.

Basic Low Pass filter (CB12558E)
The circuit shown in the figure is suggested by National Semiconductor and makes use of an...
Multitest (CB22213E)
This circuit, suitable for tube equipment, was found in an old documentation. It uses a high...
Pulse Generator (CB24910E)
This circuit is part of an integrated circuit tester published in an article in Radio Electronics...