This oscillator provides a sinusoidal signal and can be applied to other operational amplifiers. The stabilization is done by diodes and for the indicated component values the frequency is 1 kHz.
This 5.1 MHz circuit was found in a 1980s documentation. The frequency is given by the crystal and...
This circuit was found in a 1987 publication, but it is still valid today. What is done is to...
This listening transmitter uses an integrated circuit that is uncommon today. The circuit was...