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+12, +6, -6, -12V Power Supply

D

David King

Jan 1, 1970
0
I am trying to powr an old test instrument with a dead supply.

What would be the most straightforward way to make a regulated DC
power supply with the following four voltages plus earth reference?

+12V
+6V

0V (Earth reference)

-6V
-12V

250mA per rail, eg. 1A total

One possible option might be to use a 1A 12VDC regulated plugpack, and
build from there. I assume that would eliminate the need to regulate
the remaining three voltage outputs separately.

Thanks for any suggestions.

David King
 
R

Rich Grise

Jan 1, 1970
0
David said:
I am trying to powr an old test instrument with a dead supply.

What would be the most straightforward way to make a regulated DC
power supply with the following four voltages plus earth reference?

+12V
+6V

0V (Earth reference)

-6V
-12V

250mA per rail, eg. 1A total
Most straightforward? Four of these:
http://www.radioshack.com/product/index.jsp?productId=2062243#

and a sixteen-pack of alkaline D cells. (or four four-packs,
etc.)

Wiring the assembly appropriately is left as an exercise for the
student. ;-)

Cheers!
Rich
 
S

Spehro Pefhany

Jan 1, 1970
0
I am trying to powr an old test instrument with a dead supply.

What would be the most straightforward way to make a regulated DC
power supply with the following four voltages plus earth reference?

+12V
+6V

0V (Earth reference)

-6V
-12V

250mA per rail, eg. 1A total

One possible option might be to use a 1A 12VDC regulated plugpack, and
build from there. I assume that would eliminate the need to regulate
the remaining three voltage outputs separately.

Thanks for any suggestions.

David King

A power supply with +/-12VDC output and a couple of linear regulators
(eg. LM317/LM337) and a few passives would be pretty easy. If the
current drain is really 250mA per rail then it will dissipate an
additional 3W in the regulators (1.5W each), so they'll need small
heatsinks.

If it's a sensitive instrument you might need to pay attention to the
quality of the supply (for example, ripple on some or all of the
rails).


Best regards,
Spehro Pefhany
 
M

Martin Riddle

Jan 1, 1970
0
David King said:
I am trying to powr an old test instrument with a dead supply.

What would be the most straightforward way to make a regulated DC
power supply with the following four voltages plus earth reference?

+12V
+6V

0V (Earth reference)

-6V
-12V

250mA per rail, eg. 1A total

One possible option might be to use a 1A 12VDC regulated plugpack, and
build from there. I assume that would eliminate the need to regulate
the remaining three voltage outputs separately.

Thanks for any suggestions.

David King

I would go for a +/- 5v regulators a diode voltage drop above ground.

Unless you can get a LM7806
<http://www.mouser.com/ProductDetail...GAEpiMZZMtUqDgmOWBjgC5jv%2bsRCBsGZMB3bTuZR2c=>

and a 7906
<http://www.mouser.com/ProductDetail/Fairchild-Semiconductor/LM7906CT/?qs=AxPfoIcMNKLKLeFrwsA0LA==>

Mouser also has OnSemi 6 volt regulators.

I think the +/- 12v would be trivial.

Cheers
 
W

Winston

Jan 1, 1970
0
Fred Bloggs wrote:

(...)
Fix the dead supply. Be like Frankenstein, bring it back to life...

That's 'Fronkensteen'.


--Winston
 
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