In this video I take three old surplus switched mode power blocks and connect them together to make a split-voltage (or multi-voltage) power supply.
By Julian
Youtuber, shed dweller, solar charge controller aficionado
Good morning all…
Youtuber, shed dweller, solar charge controller aficionado
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"Change sex or orchestrate yourself (same thing, really) with the ETI Vocoder" Haha, wtf!
Split rails are certainly interesting project.
nice video but linear power supply at the rated load will show output when you drive rated load! you probably measured voltage without any load:)
I need a multimeter i want one.i have dc motors from printers,VCR,cd player,RC CARS also i have computers fans,different sizes i am going to find more computer fans like for excample: the Lexmark printer has a 24v avc fan 0.30 amps.i want that fan.i have circuit boards i took apart from printers,VCR,and pc.☺
Same
shud of rid the plastic and linked all the AC inputs lol now ya started me off lol
WOW THANK YOU!!! I have been trying to get my head around the plus and minus 12 volt power idea for some time, since I purchased an amplifier for a project that required such a power supply. For some reason, my mind just could not wrap itself around the idea of a -12 volt power and a +12 volt power, and how the difference could be made with just ground and live DC. Suddenly it all makes perfect sense, I have tons of those old bricks laying around at home, so when I get back there, I shall build one just like this and be able to make the little Amp do it's job!!! I knew if I looked long enough I could find out how this works, you and Bigclive are my two favorite professors of Electronics across the waves.
Thanks for the great tutorials!!! I try to make same as shown in the video with 3 power blocks and i recive negative voltages (-12v for my simple eurorack modular system). when i measured the voltages they was just fine, but when i measured the ampers with my multimeter they actualy was growing more and more above 20ampers and the wires of the multimeter start geting hot 🙁 ! I do not understand where i do mistake! any ideas?
Yeay, it works!!! thank you very much
Can you help what is the difference between – and + voltage e.g. Would I be able to power a 5v led with -5 volts
When I bought my DDS kit I found out about the three voltages, but I ended up buying a 30v CT transformer and making a +/- 12VDC power supply and taking 5 volts off of the +12 with a 5 volt reg. I like your idea better!
Julian Ilett You really ought to look into a PSU like that used in the O2 headphone amp. Basically, using a single 12-15VAC input, 2 diodes forming two half wave rectifiers, and a few thousand uF of capacitance for the negative and positive rail, will give you a nice split dc supply from a single AC input. Add a 7812/7912 and you're set. You can easily regulate the 5vdc off the same input too, meaning you'd only need one transformer. I would think for the kind of power draw that a signal gen would need, this supply would be happy to supply the necessary power. I've used it up to about 300ma per rail, with no trouble. It just requires bigger caps to get clean DC out.
Spent the day with my arduino collection, it was a lot of fun but got distracted and blew up my one and only Nano. New Nano's now on their way from China if our dear leader does not shut down trade over the last assault on federal databases.
Computer PSU has all you need and it is safer, way safer 🙂
Why not use a pc power supply? Both 12s and a 5, think there is a 3.3 too… work well under load… also several amps at 12v
For the linear power supply it's probably 12v RMW voltage … 12(sqrt(2)) … that's about 16.9 v
I got a bit nervous when you put your finger very close to the power wires…