LCDuino (arduino) DIY audio preamp system

[linux-works]

showing my build of my own LCDuino-controlled audio preamp:



more info here: https://www.flickr.com/photos/linux-works/16832746374/in/photostream

summary:

- audio (line in, line out) preamp and i/o selector that is arduino controlled.
- learning receive-side IR (bring-your-own IR remote)
- motorized pot as control element (no audio goes thru it)
- telco quality latching relays used in passive R2R attenuator, 127.5dB range in half dB steps
- hitachi 2x14 lcd display with LCDuino backpack module behind it
- extensive customizable menu system (port names, etc)
- hooks for remote-remote control (web-based, wifi, xbee)
- planned integration with remote audio-video-power switches

blank boards for all that are available.  all parts are easily buyable at mouser/etc.  thruhole used for all boards (easy DIY).  schematics, board layouts, source code and makefiles (etc) available for download.

I spent a lot of time on this (as did my partner, AMB labs).  we tried to make something unique and high quality, with a strong DIY focus.

[Marco]

Very nostalgic looking, apart from those stitched ground planes.

[linux-works]

thanks.  on the motherboard there is a small digital GP and the large one behind that is the analog.

having such huge GPs lets me get away with a plastic case and still not have any significant hum.  (I didn't design the motherboard, though; that's my partner-in-crime's work)