Mr modnaR Posted October 4, 2006 Report Share Posted October 4, 2006 http://uk.farnell.com/jsp/endecaSearch/partDetail.jsp?SKU=1214645would this work for a psu for my SID? it outputs 7VAC and 17VAC. i'd regulate them to 5VDC and 15VDC. i'm just a bit unsure whether or not it would work being that it is a flyback transformer allegedly....cheers Quote Link to comment Share on other sites More sharing options...
pay_c Posted October 6, 2006 Report Share Posted October 6, 2006 Looks pretty good. But there are a few things to consider:- Use low-drop voltage regulators - this way you´ll certainly be on the right side (dropping 7 V to 5 V with a standard 78xx *might* be a little on the edge).- SHIIIIIELDING - these standard trafos certainly bring in a BUNCH of hum. Either put it into a external box (best way perhaps) and shield it (e.g. just use a metal box) or shield it thoroughly within your box (metal plates everywhere - pulled to ground).- Working with high voltage (125 V AC) is NOT FUNNY AT ALL. It´s kinda dangerous (I talk about something I do know ... two times ... *cough*) and dammit it hurts! So only work on that if you KNOW what you´re doing and be extra-super-doopa-ultra-color careful. Quote Link to comment Share on other sites More sharing options...
Mr modnaR Posted October 6, 2006 Author Report Share Posted October 6, 2006 thanks for the reply!i went with a different one in the end. it outputs 4x7VAC. i'll connect two in series for 14VAC and two in parallel for 7VAC at twice the current capacity of one secondary.7*1.42=9.94VDC how much will the rectifier and 7805 take away? i have almost 5V to play with, right?cheers Quote Link to comment Share on other sites More sharing options...
RTurner Posted October 6, 2006 Report Share Posted October 6, 2006 If sheilding is an issue (which it will be, if it's in the same box), try finding a toroidal transformer instead. Quote Link to comment Share on other sites More sharing options...
Mr modnaR Posted October 7, 2006 Author Report Share Posted October 7, 2006 it is a toroidal one, why is that better? do they give out less hum? Quote Link to comment Share on other sites More sharing options...
pay_c Posted October 7, 2006 Report Share Posted October 7, 2006 Yep, and they have better efficeny, too. Overall .. they're just better... ;DWith a heatsink attached, the 7805 will take the 10 V easily. Quote Link to comment Share on other sites More sharing options...
Mr modnaR Posted October 7, 2006 Author Report Share Posted October 7, 2006 nah i meant 'would it be enough'? you said dropping 7V to 5V would be a close call for a 7805. Quote Link to comment Share on other sites More sharing options...
pay_c Posted October 8, 2006 Report Share Posted October 8, 2006 aaaahhh, ok. -> yup... ;D Quote Link to comment Share on other sites More sharing options...
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