This circuit was found in a 90’s Popular Electronics. The circuit is used to analyze noise in vehicles. The output must be in a low impedance headset.
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...