DIY Power supply?

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nevetsokyeron
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DIY Power supply?

Post by nevetsokyeron » Sun Jul 10, 2016 12:41 am

Can anyone recommend a good starter DIY power supply unit?

Kit or PCBs

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Broadwave
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Post by Broadwave » Sun Jul 10, 2016 1:16 am

The Digisound Modular 80 PSU - It's an old design, but VERY stable - 3 of them in my Modular, no problems with them so far.

http://www.digisound80.co.uk/digisound/modules/80-1.htm

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seamoss
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Post by seamoss » Sun Jul 10, 2016 1:18 am

I am not aware of any kits but I'm sure there are some. But if you have at least a basic understanding of electronics, I highly suggest you build one from scratch, it is by far the cheapest option, and you'll learn the most from it.
Linear is the way to go, get a transformer with roughly 15v (or 12v for Euro) outputs, connect the two rectifiers, and, for a simple and cheap supply, just put 7815 and 7915 (or 7812 and 7912 for Euro) chips on there along with some high value capacitors on either side (anything from 1u to 1000u, just throw what you have on there) and you're done. Don't forget to put in a fuse or two.
For an almost-ready-made solution, see this thread viewtopic.php?t=89913&start=0
But if you insist on a kit, I'm sure someone else will have that information. Google, probably :mrgreen:

(Edit: I should note that the 78xx and 79xx chips are only suitable for about 600mA current draw without heatsinks. They are also not the best solution for a power supply, but by far the simplest)

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duff
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Post by duff » Sun Jul 10, 2016 1:48 am

Check this power options thread - particularly the linked google doc

I'm mostly using FC Powers which are dirt cheap and effective.

Note - although this is labelled as euro most are buildable/available in +/-15v variants

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nevetsokyeron
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Post by nevetsokyeron » Sun Jul 10, 2016 2:37 am

Thanks for those replies! Looks like I've got some reading to do.

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PWM
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Post by PWM » Sun Jul 10, 2016 3:21 am

seamoss wrote:I am not aware of any kits but I'm sure there are some. But if you have at least a basic understanding of electronics, I highly suggest you build one from scratch, it is by far the cheapest option, and you'll learn the most from it.
Linear is the way to go, get a transformer with roughly 15v (or 12v for Euro) outputs, connect the two rectifiers, and, for a simple and cheap supply, just put 7815 and 7915 (or 7812 and 7912 for Euro) chips on there along with some high value capacitors on either side (anything from 1u to 1000u, just throw what you have on there) and you're done. Don't forget to put in a fuse or two.
For an almost-ready-made solution, see this thread viewtopic.php?t=89913&start=0
But if you insist on a kit, I'm sure someone else will have that information. Google, probably :mrgreen:

(Edit: I should note that the 78xx and 79xx chips are only suitable for about 600mA current draw without heatsinks. They are also not the best solution for a power supply, but by far the simplest)

Just to be clear. For a +/-12V PSU you want a transformer that outputs 2x 15V at least, for a +/- 15 PSU you want a 2x 18V.
Especially with the 78xx/79xx but all the regulators I now of use up some of the voltage to regulate.

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satindas
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Post by satindas » Sun Jul 10, 2016 4:45 am

Ray Wilson's LM317/337 adjustable supply is great if you can etch/drill etc. If not, Soundtronics in the UK has kits at a reasonable price.

EDIT: You'll need a pcb too ! :hihi:
These are bizarre manifestations of untamed high-frequency parasitic oscillations...
www.psycox.co.uk

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PWM
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Post by PWM » Sun Jul 10, 2016 5:14 am

satindas wrote:Ray Wilson's LM317/337 adjustable supply is great if you can etch/drill etc. If not, Soundtronics in the UK has kits at a reasonable price.

EDIT: You'll need a pcb too ! :hihi:
Agreed. A very stable PSU.

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seamoss
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Post by seamoss » Sun Jul 10, 2016 6:34 am

PWM wrote:
seamoss wrote:I am not aware of any kits but I'm sure there are some. But if you have at least a basic understanding of electronics, I highly suggest you build one from scratch, it is by far the cheapest option, and you'll learn the most from it.
Linear is the way to go, get a transformer with roughly 15v (or 12v for Euro) outputs, connect the two rectifiers, and, for a simple and cheap supply, just put 7815 and 7915 (or 7812 and 7912 for Euro) chips on there along with some high value capacitors on either side (anything from 1u to 1000u, just throw what you have on there) and you're done. Don't forget to put in a fuse or two.
For an almost-ready-made solution, see this thread viewtopic.php?t=89913&start=0
But if you insist on a kit, I'm sure someone else will have that information. Google, probably :mrgreen:

(Edit: I should note that the 78xx and 79xx chips are only suitable for about 600mA current draw without heatsinks. They are also not the best solution for a power supply, but by far the simplest)

Just to be clear. For a +/-12V PSU you want a transformer that outputs 2x 15V at least, for a +/- 15 PSU you want a 2x 18V.
Especially with the 78xx/79xx but all the regulators I now of use up some of the voltage to regulate.
The 78xx/79xx chips need about 2V overhead voltage to operate. A 12V transformer will put out about 15.6V DC with no load, and that slowly drops with increasing load, but still, even a 12V transformer would work for smaller supplies

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qfactor
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Post by qfactor » Sun Jul 10, 2016 7:27 am

Frequency Central has a pretty basic level PSU Kit as well.
Of course, GMSN is the other, as has been mentioned above already.
These are the easier to build ones.

Then the "not too easy" ones are like the Synthrotek ones that would require a bit more soldering skills.
They also have another PSU that is an easier build.

:tu:

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syntherjack
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Post by syntherjack » Tue Jul 12, 2016 3:26 am

You can check my DIY PSU project, with schematics and PCB. Works quite well in my setup. It is based on Doepfers PSU. I posted it also here somewhere I think.

http://syntherjack.net/modular-synth-power-supply/

Cheers
Jack
homepage :: syntherjack.net

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Troubleshooter
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Post by Troubleshooter » Tue Jul 12, 2016 7:14 am

http://www.benl.ebay.be/itm/LM317-LM337 ... 1574523554

Brought to my door for only 6 euros. I'm loving this PSU for my modular stuff.

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Post by tojpeters » Tue Jul 12, 2016 11:36 am

Jameco has a simple kit listed in the beginners project section.

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qfactor
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Post by qfactor » Wed Jul 13, 2016 4:27 am

Troubleshooter wrote:http://www.benl.ebay.be/itm/LM317-LM337 ... 1574523554

Brought to my door for only 6 euros. I'm loving this PSU for my modular stuff.
This is interesting. Would you know how many milliamperes it gives out per rail, if you set it to +/-12v?

:tu:

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qfactor
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Post by qfactor » Sat Jul 23, 2016 1:46 am

Troubleshooter wrote:http://www.benl.ebay.be/itm/LM317-LM337 ... 1574523554

Brought to my door for only 6 euros. I'm loving this PSU for my modular stuff.
Hi, another question, looking at this schematic. What AC input does this need for its input to the circuit? 240v?!! :despair:

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Post by seamoss » Sat Jul 23, 2016 2:17 am

qfactor wrote:
Troubleshooter wrote:http://www.benl.ebay.be/itm/LM317-LM337 ... 1574523554

Brought to my door for only 6 euros. I'm loving this PSU for my modular stuff.
Hi, another question, looking at this schematic. What AC input does this need for its input to the circuit? 240v?!! :despair:
The input should probably be around 30vac, give or take a few volts. You will need a center tapped transformer for this, which is the most expensive part. You can probably macgyver it with two 15v transformers, but I would be careful with that.
The center tap goes to the ground connection and the two remaining wires go to the two ac inputs

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