MCU controlled DC Protect for SKA

gbyleveldt · 12th October 2006, 07:41 PM

I started this project in the SKA construction thread, but I was verging on threadjacking, so figured I would make a new thread for this. For all you sportsfans that just joined now, I thought it might be a pretty wacky idea to have a CPU control the basic functions of my amp. It's pretty simple at this stage, but I plan on expanding it as time goes by. Next step is temperature measurement and RS422 control with my pre-amp( I went overboard on that as well!!)

I'm better at things digital that analog, so this was a learning experience for me. Anyway, becuase I wanted the CPU ground and Amp grounds to be separated, I had to resort to using optocouplers to detect the possible DC from the amps. I've spent quite some time testing the circuit and after some tweaking, I'm happy to report it is quite reliable. I've verified that it trips below 13Hz with a sinewave ~50Vpk. Obviously it trip immediately with DC present.

gbyleveldt · 12th October 2006, 07:52 PM

CPU schematic

gbyleveldt · 12th October 2006, 07:53 PM

DC protect card

Comments and suggestions are welcome

gbyleveldt · 12th October 2006, 07:55 PM

C Source code. Still to be done is the RS422 driver and the Maxim DS1820 1wire interface

12th October 2006, 07:41 PM	#1
gbyleveldt diyAudio Member Join Date: Jun 2006	MCU controlled DC Protect for SKA I started this project in the SKA construction thread, but I was verging on threadjacking, so figured I would make a new thread for this. For all you sportsfans that just joined now, I thought it might be a pretty wacky idea to have a CPU control the basic functions of my amp. It's pretty simple at this stage, but I plan on expanding it as time goes by. Next step is temperature measurement and RS422 control with my pre-amp( I went overboard on that as well!!) I'm better at things digital that analog, so this was a learning experience for me. Anyway, becuase I wanted the CPU ground and Amp grounds to be separated, I had to resort to using optocouplers to detect the possible DC from the amps. I've spent quite some time testing the circuit and after some tweaking, I'm happy to report it is quite reliable. I've verified that it trips below 13Hz with a sinewave ~50Vpk. Obviously it trip immediately with DC present.

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