mookie Posted February 12, 2008 Report Share Posted February 12, 2008 I hope I'm not covering old ground with this post but after two days reading and note taking I'm left with one more thing (i hope) I need to get straight.I'm looking to use a PSU salvaged from a DVD player. The PSU has regulated outputs at +5v and +12v. The 5v supply is straightforward and following the documentation for the optomised PSU I can see quite clearly how to feed it into the various modules. My confusion arises from the power feed into the SID moduless.I suspected I would be able to make a similar arrangement to the core module and bypass the rectifier and C9. However, reading the info suggests I would be better off ignoring that section and just feed the DC input into the rectifier, but to do that it seems to be suggested that I would need to supply 14v. Is this to compensate for any voltage loss through the rectifier (which as I'm typing this I'm beginning to think would be 1.4v which starts to make sense) but given I'm using an 8580 which only requires 9v would that mean I can carry on and supply the module with 12v.Please excuse the rambling, due in no small part to me still trying to organise all the information I've been taking in in the last couple of days and my own limited knowledge of electronics.Thanks in advance Quote Link to comment Share on other sites More sharing options...
nILS Posted February 12, 2008 Report Share Posted February 12, 2008 The 14V aren't suggested because of the rectifier. The regulator on the SID board takes the 14V and regulates it to 12/9 (7812/7809) depending on the SID you are using. For a 7809 (-> 9V for 6582 and 8580) supplying them with 12V will be fine. Quote Link to comment Share on other sites More sharing options...
mookie Posted February 12, 2008 Author Report Share Posted February 12, 2008 Thankyou very much. I had a feeling that was the case. Would it be the case then that I can drop BR1 and C9 and feed the power in where C9 was. Quote Link to comment Share on other sites More sharing options...
nILS Posted February 12, 2008 Report Share Posted February 12, 2008 Yes, just make sure you get the polarity right ;-) Quote Link to comment Share on other sites More sharing options...
dj3nk Posted February 13, 2008 Report Share Posted February 13, 2008 I think your supply is a switchin supply. It's not good for audio purposes. You will get noise.greetz Quote Link to comment Share on other sites More sharing options...
stryd_one Posted February 14, 2008 Report Share Posted February 14, 2008 I fear dj3nk is correct. BTW, doesn't the rectifier have a small voltage drop also? Not as much as the vreg, but still a volt or so? Quote Link to comment Share on other sites More sharing options...
dj3nk Posted February 14, 2008 Report Share Posted February 14, 2008 i think it was 0.7 volts dropped from the regulator. Quote Link to comment Share on other sites More sharing options...
mookie Posted February 19, 2008 Author Report Share Posted February 19, 2008 You know what, you're right. I didn't even think about it, I was aware of the problems of a switching supply, but one glance and it's pretty obvious. Not to worry, the original query still stands, it just means I'll have to put together a different supply. Not a problem I've got a few lumps of iron knocking around Quote Link to comment Share on other sites More sharing options...
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