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
Hello Altitude
Im very interested in your Design.
THX Acul
hi im interested
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
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
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?
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
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
looks nice man.
maybe you could just make the board shared and searchable on oshpark?
then we could order it.
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?
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
Awesome Altitude! Thanks for clearing that up.
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.
Would you mind posting (or reposting) the BOM and the Eagle files?
yes i,m interesting can you give ne eagle files and bom bill of material
