Atmel ATtiny2313 two 1.5V AA batteries powered electronic piano circuit connected in series (3V) can be operated. PB3 – PB4 16 on pins 15 and 32 ohm speaker connected to these pins as exit. 13 pieces in varying shades... Electronics Projects, Electronic Piano Circuit Attiny2313 Simple Audio Project "avr project, microcontroller projects, " Date 2019/08/02