Altitude Posted October 15, 2014 Report Share Posted October 15, 2014 This is based on a previous design I had used in the past with some improvements (smaller size, switching 5V reg). Its a 7VA trafo which gives 580 mA max, not a lot but enough for my needs (size was the big factor here). Standard 7812 and 7912 linear vRegs with a switching Recom R-785.0-0.5 for the +5. Total cost was ~$50 including the board. If anyone is interested, I'll post the BOM and eagle files 1 Quote Link to comment Share on other sites More sharing options...
Acul Posted October 15, 2014 Report Share Posted October 15, 2014 Hello Altitude Im very interested in your Design. THX Acul Quote Link to comment Share on other sites More sharing options...
electrodancer Posted October 15, 2014 Report Share Posted October 15, 2014 hi im interested Quote Link to comment Share on other sites More sharing options...
Altitude Posted October 15, 2014 Author Report Share Posted October 15, 2014 Ok, I'll do up a package shortly. FYI, the way it's laid out now is the primary is in parallel for 115V, it will need to be changed to series for 220 Quote Link to comment Share on other sites More sharing options...
Hawkeye Posted October 16, 2014 Report Share Posted October 16, 2014 (edited) Lookin´ very nice, man! :-) Especially the linear regs are good for AOUT stuff - methinks using switchers (like in those commonly available "open frame psus") are not top notch for feeding into modular stuff... Many greets, Peter Edited October 16, 2014 by Hawkeye Quote Link to comment Share on other sites More sharing options...
Shuriken Posted October 20, 2014 Report Share Posted October 20, 2014 Lookin´ very nice, man! :-) Especially the linear regs are good for AOUT stuff - methinks using switchers (like in those commonly available "open frame psus") are not top notch for feeding into modular stuff... Many greets, Peter If you want to use a linear regulator for modular stuff, wouldn't you rather use an LM317/337? Quote Link to comment Share on other sites More sharing options...
Alasdair Moon Posted October 21, 2014 Report Share Posted October 21, 2014 (edited) I'm interested too .. looks very useful and for the LM vs 78xx/79xx .... Ken Stone (CGS) uses 78xx/79xx for his PSU MFOS uses LM78xx / 79xx for his but I also have a MCV interface that uses LM317 for +-15V Edited October 21, 2014 by Ungleichklang Quote Link to comment Share on other sites More sharing options...
Altitude Posted October 21, 2014 Author Report Share Posted October 21, 2014 (edited) I didnt go with the adjustable for simply for size, no need for it here. I may need to make some 220V versions of this and would be willing to offer 2 boards with the right transformer, switching 5V vReg, and bridge rectifier as a partial kit. If anyone is interested, shoot me a PM Edited October 21, 2014 by Altitude Quote Link to comment Share on other sites More sharing options...
k-rAd MB6401 Posted November 5, 2014 Report Share Posted November 5, 2014 looks nice man. maybe you could just make the board shared and searchable on oshpark? then we could order it. Quote Link to comment Share on other sites More sharing options...
k-rAd MB6401 Posted November 13, 2014 Report Share Posted November 13, 2014 (edited) Also there may be a problem with this transformer. The min input voltage fora 7812 or 7912 is usually a few volts more than 12v. Voltage regulators like the 7812 usually call for 14v min input. So i would imagine that the transformer should be slightly larger 14v or even 18v per side. I'm using a 36v center tapped transformer for my modular and it works nicely. Have you tested this supply with a load? Edited November 13, 2014 by k-rAd MB6401 Quote Link to comment Share on other sites More sharing options...
Altitude Posted November 13, 2014 Author Report Share Posted November 13, 2014 (edited) yes. works fine. (12VAC x 1.414)-1.4 = 15.4 VDC. Using a 18-0-18 trafo for a +/- 12 setup is a waste and you're just burning off that extra voltage as heat. Measure the input of your vRegs, you are probably around 24V! A transformers VAC output is an RMS measurement so to find out the corresponding DC output (at load) the formula is VP =(V secondary rms x 1.414) - 1.4 V Edited November 13, 2014 by Altitude 1 Quote Link to comment Share on other sites More sharing options...
k-rAd MB6401 Posted November 14, 2014 Report Share Posted November 14, 2014 Awesome Altitude! Thanks for clearing that up. Quote Link to comment Share on other sites More sharing options...
k-rAd MB6401 Posted November 14, 2014 Report Share Posted November 14, 2014 I have been using Kicad to design boards so i dont have eagle. maybe the gerber files would be usefull. sorry for questioning the design. i was just trying to help. :) Any chance for an oshpark share. i have some boards up there too. Quote Link to comment Share on other sites More sharing options...
Ghost_Dog Posted October 16, 2016 Report Share Posted October 16, 2016 Would you mind posting (or reposting) the BOM and the Eagle files? Quote Link to comment Share on other sites More sharing options...
tedysuwarnady Posted November 1, 2017 Report Share Posted November 1, 2017 yes i,m interesting can you give ne eagle files and bom bill of material Quote Link to comment Share on other sites More sharing options...
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