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.

Operational with adjustable gain (CB7409E)
This circuit was obtained in an Electronic Design from the 80's. It has the adjustment of the gain...
Burnt out lamp indicator (CB10449E)
This circuit was obtained in a 1977 magazine, but it can still be easily assembled, as the...
Tuned Field Strength Meter (CB5191E)
This circuit uses only passive components and must be tuned to the operating range. The circuit is...