[sdiy] +/- 5V voltage source schematic?

[Stewart Pye]

Hi Daryl,

It's pretty simple. Assuming you have a +/-15V supply, you could use a 
10k linear pot. The wiper is your output. A 10k resistor goes to each 
end of the pot. The other end of the resistor attached to the clockwise 
lug goes to +15 V, and the resistor attached the the counter clockwise 
lug goes to -15V. This will give a -5 to +5V swing.

If you want to you could buffer the output with an op amp buffer. Then 
you could use a 100k pot and 100k resistors.

Cheers,
Stew.


Daryl Groetsch wrote:
> greetings,
>
> i have been wanting to build a +/- 5V voltage source module that can
> be used to offset a VCA, overdrive an input on a filter, that sort of
> thing. the closest thing i've found is the Oakley Control PCB seen
> here http://www.oakleysound.com/control.htm but it seems like i should
> be able to build one from scratch, should be a pretty simple
> circuit..? i'm a very confident builder but not so great with design.
> don't know why this type of module isn't more common (or maybe it is)
> because i'm always wanting it!
>
> i don't care about having a clean, stable voltage because i like a
> little drift or distortion. if anyone has a link to a schematic or can
> describe a simple circuit, it'd be awesome. don't want to blow
> anything up by tinkering myself too much.
>
> thanks in advance!
> daryl
>
>