micah

I troubleshot this thing all day. right now i have the "optimized" power supply going into the core only and I replaced the 7805. Still in the same boat though. I tested pins 13-14 and the voltage is not what it should be. But I'm stuck about what to do now. I don't know what could be causing this. All of my solder joints are very neat and trimmed. Very frustrating :-[

No LCD. Just the SID module. I am getting sporadic messages in my MIDI IN monitor (that's probably a good thing). Here's what it says [FC] Stop [F8] Timing Clock [FF] System Reset [FF] System Reset [FC] Stop

I just supplied 9V AC to the CORE and the 7805 still got super-hot. Is this any kind of clue as to what could be wrong?

I'm still getting the correct voltages throughout the board. HMM... Could my 7805 need replacing?

I built the SID + Core up this week, tested it, got everything working etc. I turned it on yesterday and quickly looked up some some CC values for the controls, when I started smelling the heat. I unplugged it, I touched the 7805 and nearly burned my fingers off! I'm currently feeding the CORE 13V AC. Well then I touched the PIC (I used my other hand for that) and nearly burnt my fingers off again! Then I tested it (in short intervals) and there was nothing. Not even a MIDI request. ??? So what are the possible culprits? A short? What should I look for and test, before I order another PIC and fry that too? I just don't understand what could have happened suddenly.

Just bought a variable 9v-13v AC power adapter at radio shack. started it on 13V and worked my way down. It still makes sound and the noise goes down at 9V. Well, overall, I'm confused about the core/sid ratings maybe that will change once I connect the LCD, more modules etc. Is there any reason that I should avoid powering it at 9V ???

thanks for sending me your chat. yes, my 16V transformer is actually delivering 19V. Maybe I should go out and get a 14V 500ma as suggested. Or maybe I should just feed J2 a DC voltage and bypass the rectifier?? Hmmm...

Please pardon my ignorance as this is all very new to me. This is also from http://www.ucapps.de/mbhp_sid.html: "If you don't want to use the C64 PSU, you can power both modules with the same transformer or wallwart for both modules. 14-15V AC (!!!before!!! the regulation unit) are required for a good and noiseless sound." I used a 16V AC transformer. I tested all the voltages and they are ok. 12v at the sid board, 5v at the sid PIC and 5v on the core. I feel like I'm not understanding a fundamental concept here in regards to the power supply. I also have a hard drive power supply that delivers both 5v/12v DC. would that be better? ** i also just realized that my transformer is rated at 1000mA. could this also contibute to my overheating?

maybe I misunderstood then. Why does everything I read say to power with a 14-15V AC psu (if not using the original)??? :-[

Hi all, i am the proud owner of a new MBSID phase 1. I actually used a 16V AC power adapter to power the core and now my 7805 is burning HOT! My question is this: How hot is too hot? At present, it's too hot to touch and I can feel the heat if I put my hand about 6 inches away. What can I do to eliminate and/or reduce this heat dissipation? Another regulator? Another power supply (maybe 14V?) Thanks!