toneburst Posted November 13, 2006 Report Share Posted November 13, 2006 HiOdd, and annoying one here: my single SID/Core will only work if physically disconnected from my first 'Optimised PSU', then reconnected. It will then run fine until I switch off the PSU, then when I turn it on again- no sound! If I then disconnect, wait a few seconds, then reconnect the 5V input to the Core board, it magically works again!Anyone any idea why this might happen? It doesn't seem to do this with my mk.2 optimised PSU. I'm using the same Core and SID board with the same interconnections in both cases. Both PSUs seem to put out the required 2 voltages, and the only difference between then is that the 2nd one doesn't have a power LED (I forgot), and I'm using a slightly different bridge-rectifier (I miss-ordered).It's not that important, since I have a working setup, but I'd be really interested to know why this is happening, if anyone has any ideas. It's probably something very simple- I'm an electronics newbie, afterall...Cheers,Alexhttp://www.toneburst.net Quote Link to comment Share on other sites More sharing options...
HL-SDK Posted November 13, 2006 Report Share Posted November 13, 2006 That's a damn weird problem!I dont know much about your setup, are the regulators hot? Some automatically switch themselves off...interesting... Quote Link to comment Share on other sites More sharing options...
stryd_one Posted November 14, 2006 Report Share Posted November 14, 2006 When you switch the PSU off, does it actually stop giving power? I'm thinking maybe the 5v is off but the 12v is still on or something? Quote Link to comment Share on other sites More sharing options...
toneburst Posted November 15, 2006 Author Report Share Posted November 15, 2006 When you switch the PSU off, does it actually stop giving power? I'm thinking maybe the 5v is off but the 12v is still on or something?I hadn't thought to test that. I'll check when I get home.I dont know much about your setup, are the regulators hot? Some automatically switch themselves off...Don't think so....I actually have a potentially more serious issue now though, so I can't test this just at the moment. The night before last I accidentally reversed the 14 and 5V connections from the DIN socket connected to the C64 PSU and sent 14V to the Core board, trashing my 2nd LCD, the voltage regulator (it DID get hot that time- verrrry hot), and maybe my PIC too. :(I have a new regulator and LCD on order now, so I'm waiting until they arrive now before I move on to making the DIN1X board. I'm desperately hoping that when I replace the blown regulator and LCD, everything else will still work. No idea how realistic that is though...Alexhttp://www.toneburst.net Quote Link to comment Share on other sites More sharing options...
dcer10 Posted November 19, 2006 Report Share Posted November 19, 2006 Hiya Toneburst,I know it doesnt help you now, but I have found from killing an LCD that its best to have a REALLY cheap one wired up with a ribbon connector to a socket on the board for any testing. Mine cost less than $10. I leave this one connected up until the MB is actually finished, then if it dies it doesnt matter too much.Also as a general question to anyone, what is hot in degrees for the regulator? On my core for the sequencer it is too hot to touch (with a heatsink) and seems to work all the time. I can measure the heat on it with my multimeter, how much is too much? Anyone got a datasheet on the regulator??I hope you get your problem fixed up!All the best,John Quote Link to comment Share on other sites More sharing options...
toneburst Posted November 20, 2006 Author Report Share Posted November 20, 2006 Hi John!Hiya Toneburst,I know it doesnt help you now, but I have found from killing an LCD that its best to have a REALLY cheap one wired up with a ribbon connector to a socket on the board for any testing. Mine cost less than $10. I leave this one connected up until the MB is actually finished, then if it dies it doesnt matter too much.Good advice! I've just picked up 2 new displays on eBay- one Optrex 2x20 with an LED backlight and a really cheap EL-lit 2x20 model which cost me £4.50 inc. P&P. I know I won't be able to use the backlight, but I'm not worried really, as I'm pretty sure I'll be able to see enough for testing purposes without it.Also as a general question to anyone, what is hot in degrees for the regulator? On my core for the sequencer it is too hot to touch (with a heatsink) and seems to work all the time. I can measure the heat on it with my multimeter, how much is too much? Anyone got a datasheet on the regulator??I hope you get your problem fixed up!Cheers mate! It just occured to me- it's not the regulator, but the rectifier that I think I trashed on my Core module. That doesn't usually get hot, but this time it did, so I'm guessing it's dead. My order for a replacement still hasn't turned up :(Alexhttp://www.toneburst.net Quote Link to comment Share on other sites More sharing options...
dcer10 Posted November 20, 2006 Report Share Posted November 20, 2006 Hi Alex,Glad your onto it! Its odd, I have heard of 3 people lately whos bridge rectifiers died on their cores, I wonder if its a faulty batch? Or a its from a common mistake is made which needs to be addressed like an easy way to kill them? All the best,John Quote Link to comment Share on other sites More sharing options...
stryd_one Posted November 21, 2006 Report Share Posted November 21, 2006 My guess is overheating them during soldering...Hey toneburst you can drop a pair of diodes in there instead... They should be in your local store by the 1000's :) Quote Link to comment Share on other sites More sharing options...
Mr modnaR Posted November 21, 2006 Report Share Posted November 21, 2006 you can drop a pair of diodes in there instead...don't you need four? ??? Quote Link to comment Share on other sites More sharing options...
stryd_one Posted November 21, 2006 Report Share Posted November 21, 2006 Yep. So why did I say a pair? Because ... uhm .... actually I don't know! Quote Link to comment Share on other sites More sharing options...
toneburst Posted November 21, 2006 Author Report Share Posted November 21, 2006 My replacement rectifier order just arrived- apparently it had been delivered to the wrong place...I now have 5 shiny new ones, so no need to use 4 diodes. Now to desolder the broken one. My SmashTV Core board is such a mess, what with all the stuff I've desoldered and resoldered!Alexhttp://www.toneburst.net Quote Link to comment Share on other sites More sharing options...
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