This simple clock can be used to generate signals up to 100 kHz, depending on the crystal. We found it in a 1967 documentation. Note the high supply voltage.
The frequency of this astable multivibrator depends not only on the capacitors, but also on the...
This interesting sound effect circuit that produces the sound of bulls or Bull Horn was found in...
This 1967 Raytheon circuit uses an optical coupler of the era and has a range of 800 to 200 Hz....