[sdiy] Voltage Divider for 0-30v PSU (+/-15v output)

[dragon.servicing]

Hi,
it all depends how much current you need to draw. at low currents the 
circuit will work ok. but I for higher currents I think you would need 
to use an op amp to boost the current available to the common ground rail.
regards Peter

Anthony Bisset wrote:
> Hey All,
> 
> At my recommendation my friend tried to split a 0-30v 2.5a switching
> supply into +/- 15v (for driscol powering) using a simple circuit like
> the following:
> 
> 0v ----- -- ------------------ -15v
>         |  |
>     440mf  10k resistor
> 	\  |
>            ------------------- common ground
>         /  |
>     440mf  10k resistor
> 	|  |
> 30v ---- -- ------------------ +15v
> 
> The meter shows +/-15v outputs referenced against the common ground and
> all looks well but upon loading the circuit the voltage drops to +8v and
> approx -0.5v...  Obviously we're missing something.
> 
> Are we trying something that violates the bylaws of the IEEE society?
> 
> Note the design is taken from the tonal tilt dual 9v battery to +/-9v
> power design on headwize.com which can be seen here:
> 
> http://www.headwize.com/projects/equal_prj.htm
> 
> 
> 
> 
> 
> 
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