This 1967 General Electric circuit makes use of an array of 3 (integrated) transistors for an amplifier stage. The circuit has a 500 mV output.
A square signal of about 1 kHz is produced by this astable multivibrator. Frequency is determined...
This circuit was obtained in the publication 101 Electronics Projects of 1979. The circuit can be...
Based on operational amplifiers of the time, this circuit from the 1980s has high input impedance. The...