000_0019.jpg000_0021.jpg
I have almost finished my Amp1. In the photos I have put it next to my amp32 to show size. It is in a slightly smaller box than Sebastian's amp1 but it is the same style of cast aluminium. At the moment I have got a XLR as the input and 2 speakons as the outputs but I might change it to 2 jacks / phono in to 3 x speakon out (one for bridged)
The amp is built with a SMPS250 from Connexelectronic which works perfectly but in order to get it in the case I had to do quite a few modifications. The PCB usually extends 5mm under the heatsink so I had to remove that off the whole of one side of the pcb and drill new mounting holes.
The only problem I had with the amp was the first time I switched it on, the washer I was using in the bottom left of the pcb was a bit big and had covered the +vcc power track, resulting in a worrying spark. I replaced the washer with a smaller one and now it works.


To do:
Maybe add an input transformer to invert the phase of channel 2 and to allow for balanced inputs in stereo
Paint
Wire in on off switch
Wire in mute switch
Install a pic / arduino based volume control with 8 LEDs and auto mute function (mute when signal has been below -60dB for 5 minuites)
This will be similar to http://mautner.ca/projects/hifi/ta2022.html

What do people think?