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Make + and - 12V from 24VDC?

Anyone have any simple circuits on how to make +/- 12VDC from 0-24VDC?

I would just take a center-tapped transformer, but the idea is to use
a cheap off-the-shelf power brick like the ones you can grab from
Goodwill (thrift store) for $1 each. No center taps there...

Thanks,

Michael
 
T

Tom Biasi

Jan 1, 1970
0
Anyone have any simple circuits on how to make +/- 12VDC from 0-24VDC?

I would just take a center-tapped transformer, but the idea is to use
a cheap off-the-shelf power brick like the ones you can grab from
Goodwill (thrift store) for $1 each. No center taps there...

Thanks,

Michael

Two 12 V zeners in series with a small resistor to pick up the slack.

Tom
 
E

Eeyore

Jan 1, 1970
0
Anyone have any simple circuits on how to make +/- 12VDC from 0-24VDC?

Sure. As long as the 24V isn't rounded, use an active circuit to create 'Vcc/2'
such as 2 equal value resistors and an op-amp voltage follower configuration. It
will give you 0, 12V and 24V. That's essentially the same as -12, 0 , +12.

Graham
 
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Jamie

Jan 1, 1970
0
Anyone have any simple circuits on how to make +/- 12VDC from 0-24VDC?

I would just take a center-tapped transformer, but the idea is to use
a cheap off-the-shelf power brick like the ones you can grab from
Goodwill (thrift store) for $1 each. No center taps there...

Thanks,

Michael
I have a feeling this is a home work question!.
Ok, How about a Virtual Ground? with a bridge rectifier
and filter cap before that? this will give you half of
24 volts for the +&-.
You can use a couple of zeners, an op-amp of a simple
2 resistor thingy...

Or
use 2 half wave output from one side of the tap into
2 different regulators 7812 and 7912 for example.
ect. ect..

that should give you enough to get you in trouble.
 
J

John Fields

Jan 1, 1970
0
Anyone have any simple circuits on how to make +/- 12VDC from 0-24VDC?

I would just take a center-tapped transformer, but the idea is to use
a cheap off-the-shelf power brick like the ones you can grab from
Goodwill (thrift store) for $1 each. No center taps there...
 
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