Convert single to dual supply

Wombat2 · 6th July 2006, 03:52 AM

I bought one of these on eBay

but then discovered it was single rail supply not dual. the connection for GND is just that - chassis ground with no potential between the +/- and the GND terminal.

Is there anyway I can get some sort of dual supply even temporaly for low voltage testing before applying full power to a new project?

Otherwise it's a good little power supply

ostie01 · 6th July 2006, 04:18 AM

One way of doing that is you can place 2 high wattage resistor in serie between + and ground. The + become the positive power supply, between the 2 resistors is the potential ground and the ground of the power supply become the negative .Both resistor must be of equal value since you do not want your groung having +/- a couple of volts.

This is one way that can be use easily and pretty fast, good luck

gmphadte · 6th July 2006, 05:23 AM

Use a power opamp and make a virtual ground.

Gajanan

henry zhang · 13th July 2006, 10:44 AM

Hello!What's "chassis ground ",please?Do you mean that this power supply is broken?Thanks

richie00boy · 13th July 2006, 10:47 AM

Quote:

Originally posted by gmphadte
Use a power opamp and make a virtual ground.

Gajanan

Yes see the virtual earth for car audio project on the ESP site. Don't expect much out of it though, but then again the supply is probably pretty weak anyway so may well be complementary.

richie00boy · 13th July 2006, 10:48 AM

Quote:

Originally posted by henry zhang
Hello!What's "chassis ground ",please?Do you mean that this power supply is broken?Thanks

Chassis ground means it's just a terminal connected to the case and presumably mains earth. Otherwise the supply is floating, this gives you the option to earth it.

traderbam · 13th July 2006, 11:12 AM

How much did it cost on Ebay? If cheap enough you could always buy another one and wire them in series, assuming they have
floating outputs.

richie00boy · 13th July 2006, 11:52 AM

I would imagine with the separate earth terminal they would be fully floating

henry zhang · 14th July 2006, 05:03 AM

richie00boy,thanks for your explanation.

Wombat2,
I happen to found such a powersupply yesterday.Refer to the following pictures.I opened it last night and I found that there was only a large transformer and several pieces of PCBs in it.So I advice you to mend it for yourself,if it is possible.Make sure that you will not be shocked by the input current.Good luck.

richie00boy · 14th July 2006, 08:35 AM

there is nothing to mend. He just needs a supply splitter or another supply the same.

6th July 2006, 03:52 AM	#1
Wombat2 diyAudio Member Join Date: Nov 2003 Location: Brisbane	Convert single to dual supply I bought one of these on eBay but then discovered it was single rail supply not dual. the connection for GND is just that - chassis ground with no potential between the +/- and the GND terminal. Is there anyway I can get some sort of dual supply even temporaly for low voltage testing before applying full power to a new project? Otherwise it's a good little power supply __________________ David L

13th July 2006, 11:52 AM	#8
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	I would imagine with the separate earth terminal they would be fully floating __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

14th July 2006, 08:35 AM	#10
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	there is nothing to mend. He just needs a supply splitter or another supply the same. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

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6th July 2006, 04:18 AM	#2
ostie01 diyAudio Member Join Date: Mar 2005 Location: quebec	One way of doing that is you can place 2 high wattage resistor in serie between + and ground. The + become the positive power supply, between the 2 resistors is the potential ground and the ground of the power supply become the negative .Both resistor must be of equal value since you do not want your groung having +/- a couple of volts. This is one way that can be use easily and pretty fast, good luck

6th July 2006, 05:23 AM	#3
gmphadte diyAudio Member Join Date: Jul 2003 Location: Dona paula, Goa	Use a power opamp and make a virtual ground. Gajanan

13th July 2006, 10:44 AM	#4
henry zhang diyAudio Member Join Date: Jun 2006	Hello!What's "chassis ground ",please?Do you mean that this power supply is broken?Thanks

13th July 2006, 11:12 AM	#7
traderbam diyAudio Member Join Date: Jan 2002 Location: Earth	How much did it cost on Ebay? If cheap enough you could always buy another one and wire them in series, assuming they have floating outputs.

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