Ghost_Dog Posted April 6, 2015 Report Share Posted April 6, 2015 I would like to use my ±15V PSU with my MIDIBox CV, at least for testing purposes. Can I use a 7812 and a 7912 based circuit like in the picture below or is this a bad idea? 1 Quote Link to comment Share on other sites More sharing options...
slo Posted April 7, 2015 Report Share Posted April 7, 2015 Have a look at this link for a bi-polar supply. The one you posted does not have a common ground and has different regulators, the regulators you mention are for 12v supplies. Quote Link to comment Share on other sites More sharing options...
Holypeyote Posted April 7, 2015 Report Share Posted April 7, 2015 (edited) I don't now how much current the CV draws but if it is below 50-75 mA you could also use the circuit in the link. The advantage of this, is that you could use a 9v dc adapter or 12v with a regulator. It uses the Lt1054 which can double the voltage supplied and with the vero layout supplied transform it in a bipolar supply. The downside is that the LT1054 is not very cheap but can be had from aliexpress for under a dollar. I'm going to use the circuit for powering a solo VCF for a project. http://tagboardeffects.blogspot.nl/2014/01/bipolar-voltage-converter.html Edited April 7, 2015 by Holypeyote Quote Link to comment Share on other sites More sharing options...
Ghost_Dog Posted April 14, 2015 Author Report Share Posted April 14, 2015 Thank you both. I see that my question wasn't really clear. I have a PSU with ±15V laying around and wanted to make a sort of adapter for testing purposes. The parts are on their way now. The image I posted shows two alternatives for the positive half the PSU, and I would use the one on the top and duplicate it for the negative part. Like this one: http://www.midibox.org/dokuwiki/doku.php?id=bipolar_12v_psu#center_tap_transformer, but with a complete PSU instead of a transformer on its input. I should probably have posted this one in the first place. I will probably get a transformer and make a complete PSU out of it once everything works. Quote Link to comment Share on other sites More sharing options...
latigid on Posted April 14, 2015 Report Share Posted April 14, 2015 It's not clear what you have. When you say "a complete PSU instead of a transformer on its input" does this mean you have a 15 V plug pack of some sort? If so is it AC or DC? I think if you try to wire a 7812 and a 7912 in parallel you will have problems. Or if you've already got a regulated bipolar +/- 15 V PSU then that's fine to use for AOUT_NG without modification. Is it linear or switching? Linear will be better. Some more info or pictures will help to get the best advice for you. Quote Link to comment Share on other sites More sharing options...
Alasdair Moon Posted April 14, 2015 Report Share Posted April 14, 2015 The AOUT can be used with +-15v?? Cool cause I have the same idea ... in my case to build the aout into modular using the line driver boards Quote Link to comment Share on other sites More sharing options...
Ghost_Dog Posted April 14, 2015 Author Report Share Posted April 14, 2015 I have a linear, bipolar, regulated ±15V PSU, but I have an AOUT_LC, not NG. Does it work with 15V, too? Quote Link to comment Share on other sites More sharing options...
latigid on Posted April 14, 2015 Report Share Posted April 14, 2015 I have a linear, bipolar, regulated ±15V PSU, but I have an AOUT_LC, not NG. Does it work with 15V, too? The LC uses a TL072, fine to run this on +/- 15V. The only change would be to adjust R50 and R52 to make the offset trimming easier, but maybe it's fine as-is. Try it! Quote Link to comment Share on other sites More sharing options...
Alasdair Moon Posted April 14, 2015 Report Share Posted April 14, 2015 (edited) Just found this quote from tk about the aout ng ....... Quote Is the Aout or out NG accept the 15 V? ...... TK ....... Yes, the allowed voltage range is +/- 18V Best Regards, Thorsten. Edited April 14, 2015 by Ungleichklang Quote Link to comment Share on other sites More sharing options...
Ghost_Dog Posted April 14, 2015 Author Report Share Posted April 14, 2015 The LC uses a TL072, fine to run this on +/- 15V. The only change would be to adjust R50 and R52 to make the offset trimming easier, but maybe it's fine as-is. Try it! Cool! I will try tomorrow. Quote Link to comment Share on other sites More sharing options...
Ghost_Dog Posted May 17, 2015 Author Report Share Posted May 17, 2015 It works fine! Thanks! Quote Link to comment Share on other sites More sharing options...
latigid on Posted May 17, 2015 Report Share Posted May 17, 2015 Nice! Quote Link to comment Share on other sites More sharing options...
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