This circuit was found in a1980s Motorola documentation. The integrated circuit is from that time. The frequency depends on the crystal.
This circuit produces a modulated tone set at P1. The modulation depth is set at P1 and the pitch...
Here is another project that is based on an astable multivibrator, in a demonstration of the...
This circuit was taken from an article in Electronics Now magazine in February 1995. The power...