Found in documentation two years 80, this toy instrument uses an integrated circuit little commonly. As notes are given the values of key series resistors on the keyboard.
This circuit was obtained from Raytheon documentation from the 1960s. The transistor is one of the...
In the figure we have the traditional configuration of a pulsator or flasher with low consumption LED...
In the figure we have a simple signal tracer circuit to be coupled to the volume control of an AM...