tob Posted July 9, 2011 Report Posted July 9, 2011 I budling a core8 + sid module and LCD. I bouth everything from smashTV and going to use a C64 psu (brown). In the instructions i read to bridge the 7805 on the CORE module: http://www.ucapps.de/mbhp/mbhp_8xsid_c64_psu_optimized.pdf But my SID-module also contains a voltage regulator, should this also be bridged? http://www.midibox-shop.com/mbhp_SIDR3a.html Quote
rosch Posted July 9, 2011 Report Posted July 9, 2011 no, because the two output voltages of the C64 psu are added to about 14V and the 7809 / 78L09 on the sid module regulates this down again. Quote
tob Posted July 11, 2011 Author Report Posted July 11, 2011 no, because the two output voltages of the C64 psu are added to about 14V and the 7809 / 78L09 on the sid module regulates this down again. I missed that text on the connector 14VDC, I thought 7809 always delivered 9V. But now its 5+9V? Thanks anyway... Quote
Hawkeye Posted July 11, 2011 Report Posted July 11, 2011 As far as i know the C64 PSU delivers 9V AC, which are, after the bridge rectifier ca 9V * 1.4 or 12V, which are then fed into the 7809. But this may well be wrong :-) Bye, Peter Quote
jojjelito Posted July 11, 2011 Report Posted July 11, 2011 Nope, that 12V to 9VDC transformation sounds about right. The trick is that one of the PSU setup variants lifts the virtual ground of the 7809 with +5VDC to obtain 14V. That's referred to as PSU option B if referring to the MB6582. If you're rolling your own baseboard you could still nick a few ideas from there. 14V would only be needed from 6581 chips anyway. Quote
Hawkeye Posted July 11, 2011 Report Posted July 11, 2011 Interesting. Thanks! You never stop to learn :-) Quote
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