Music box circuit that imitates a mechanical music box with a rotating cylinder and tuned teeth (or lamellae, thank you Wikipedia ;-)
Original description
Electronic Music Box imitates MB suisse mecanisme . Microcontroleur 18F2520 4 transistors 1 chip LM386 ampli BF 1 HP. No cms. pcb single cupper face. Powered by a 9volts battery.
9150304421