This circuit allows you to adjust the balance between channels of a stereo amplifier. The circuit makes use of an analog indicator with zero in the center of the scale.
This circuit is from a 1965 General Electric publication. It uses a thermistor to fire a reed...
This circuit was obtained from the PE Hobbyist Electronics publication of 1980. The circuit is...
This Vox or sound activated relay was found in an American documentation from 1975. Equivalent...