My most rewarding projects are the ones which I actually use. I like my audio gear, so this was the perfect companion project!
On my desk I have a headphone amplifier for my AKG K702's headphones, below it I have my self built Onixia integrated amplifier for my bookshelf speakers. I have been thinking about making a global volume control for both devices for quite some time... here is the results of my efforts.


The PCB was designed around the Atmel ATTINY84 Micro Controller using V-USB.

Volume on the computer is controlled via the rotary encoder on the unit. The device also supports MUTE by depressing the knob.

It is a driverless design based around a HID consumer control device.

I may have been taking liberty's calling this an Attenuator, but technically it does not change the gain or waveform internally ;)


You can read more regarding the project on my blog:
http://runawaybrainz.blogspot.co.uk

Comments

• Adam
• 23 September 2013 at 07:02AM
• One of the most interesting videos I've seen on YouTube in a while!
  
  Brilliant project and love the end result, sleek, minimal!