[HomeBrew] Looking for tracking regulator circuit.

[John Marshall]

Hi Loren,

There's a dual tracking regulator with voltage and current capability 
in the datasheet for the L165 power op-amp available at 
http://www.st.com/stonline/books/pdf/docs/1317.pdf .  This uses an 
adjustable positive voltage regulator in the usual way and the L165 
works as an inverting amplifier to provide the negative output.

Another example at http://members.shaw.ca/roma/supply-2.html uses a 
pair of three-terminal adjustable regulators plus an op-amp to make 
them track.  This one only does plus/minus 12 volts at 1.5 amps.  With 
beefier regulators you should be able to do 3A at plus/minus 24V, but 
I'm not sure if there's a negative, adjustable 3A regulator available.

You could also use one of the newer low-current dual tracking 
regulators with external pass transistors.

Good luck!
John, KU4AF
Pittsboro, NC


On May 21, 2005, at 1:13 PM, Loren Moline WA7SKT wrote:

> ** Please do NOT cross-post messages when posting to HOMEBREW **
>
> I would like to build a bipolar power supply in which the negative 
> voltage tracks the positive voltage and voltage is variable up to say 
> 24VDC at about 3 amps. Anyone have a circuit?
>
>
> Loren
>
>
>
> Loren Moline WA7SKT  CN86cx
> Member: ARRL, Pacific Northwest VHF Society #151
> 2 Meter EME initials = 55
> 2 Meter EME with 4 X K1FO - 12's, RG-218 7/8"  coax,  IC-820H, and 
> 380W from TE Systems 1452G
>
>
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