This circuit was found in a 1968 General Electric documentation. It has an input impedance of 2 M ohms and excites a load of 16 ohms. The integrated circuit of the time is the PA237.
This circuit can be tuned in a 100 kHz band around the frequency of the crystal. The transistor can be...
The figure shows how to obtain a digitally programmed resistance using the 4066. The circuit is...
This audio oscillator has its frequency determined by C1, C2 and the inductor. The inductor can be...