I bought one of these on eBay
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
An externally hosted image should be here but it was not working when we last tested it.
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
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
This is one way that can be use easily and pretty fast, good luck
gmphadte said:
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.
henry zhang said:
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.
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.
floating outputs.
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.
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.
Attachments
Wombat2 said:
Only approximately and only if you load draws much less current. And you don't get good regulation anymore, unless your load draws constant current. It works in some cases, but it is no general solution.
Christer said:
Only want to check new circuits at low voltages to make sure there are no holes to let the smoke out then I'll hook it up to the full PSU to run at full power
I have a feeling that audio power amp IC can be used as a power amp for making virtual ground. Select a 5 pin IC like TDA2030 or something alike depending on ground current required.
Not a good solution than a second PSU, but in case...
Gajanan Phadte
Not a good solution than a second PSU, but in case...
Gajanan Phadte
Wombat2 said:
Still, your load must draw much less current than those resistors, or draw approximately equal current on both rails. It can work, but only under certain conditions.
DC-DC converter
Wombat-
Whar voltage(s) do you need? How much power? One possible solution is a DC-DC Switched-mode power supply. There are many good schematics out there that are easily scaleable for just about whatever voltage, current and power levels you could want.
Check out Rod Elliot's ESP website, as richie00boy suggests, but look at the car amplifier power supply projects. These can be adapted to whatever your requirements are.
Steve
Wombat-
Whar voltage(s) do you need? How much power? One possible solution is a DC-DC Switched-mode power supply. There are many good schematics out there that are easily scaleable for just about whatever voltage, current and power levels you could want.
Check out Rod Elliot's ESP website, as richie00boy suggests, but look at the car amplifier power supply projects. These can be adapted to whatever your requirements are.
Steve
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