Audio line level switcher using ATmega32

This was a first attempt at making a solid state switching or multiplexing device for audio signals.

It uses 4051 chips for the actual multiplexing of signals, As such it can switch 2 banks of 8, or using th INH pin of the 4051, and connecting the inputs as common, 1 bank of 16 channels.

Control is via RS232 using the USART within the ATmega32.

Initial testing showed that crosstalk on the channels was noticable, and this may limit the application for audio. Keeping the line level below 1 volt seemed important for minimising this.

Pictures of the first board and circuit are here: board circuit

I only had a DIP version of the ATmega32 on hand, otherwise I would done a surface mount version.

Sun, 30 Apr 2006 14:52 Posted in