This circuit is placed between the instrument pickup and the amplifier input. The same version can be found from other sources in this section. This is from an English magazine from the 80s.
The oscillator in figure 1 can be used in alarm, call or warning systems, producing a sound of...
This circuit was found in a 1965 General Electric manual. It is intended for cars that have...
The component used, which is not common today, is an electronic attenuator. In this application of the...