General Electric suggests this circuit in an 80's documentation. The circuit makes use of PUTs that are not common components today. Note the timing components that may change.
This circuit, found in 2002 documentation, generates a strong audio tone when the light in the...
This circuit uses a variable transformer available at the time. This turns of the windings were...
This is one of the many 7400 oscillators we have in our circuit bank. It is crystal controlled and must be...