This balance indicator for stereo amplifiers was found in an 80's Elektor. The components used are common. Zeners are 1.8 V or close to that value.
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...