This simple electronic music box circuit was found in the April 1985 issue of Radio Electronics. The components are common, and the note adjustments are made with trimpots.
This circuit was found in an American documentation from the 80s. The transistor can be any...
When the control level is increased from 0 to 1 (LO to HI), this circuit is activated, which...
The circuit in the figure is based on two integrated LM108 and its gain is basically determined by the...