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.

Low Frequency Converter 4538 (CB25388E)
This converter was found in the June 1991 issue of Radio Electronics magazine. The circuit uses...
Stepper motor as encoder (CB25685E)
This interesting application of a stepper motor as an encoder serves to test its application...
LM381 Magnetic Head Amplifier (CB25281E)
This circuit was found in the February 1990 issue of Radio Electronics magazine. The circuit uses...