My implementation of the famous Ruby 9V battery Guitar amp by Runoffgroove [<a target="_blank" rel="noopener noreferrer" href="http://www.runoffgroove.com/ruby.html">http://www.runoffgroove.com/ruby.html</a>] with some modifications inspired by ElectroSmash 1Wamp [<a target="_blank" rel="noopener noreferrer" href="https://www.electrosmash.com/1wamp">https://www.electrosmash.com/1wamp</a>].<br><br>The modifications are:<br>- Switching power by plugging in the mono jack<br>- Headphones output jack that disconnects the speaker when in use<br>