Re: Generate -+5V from 12V


"vic" <news@xxxxxxxxxxxxx> wrote in message
news:4a291f7d$0$696$426a74cc@xxxxxxxxxxxxxxx
Hi,

I need to generate a symmetric +/-5V supply from a single +12V supply. I
need about 150mA from the +5V side, and less than 50mA from the -5V side.

I've thought about using two 7805 in the following configuration :


Supply + ----+--------[7805]---- +5 V
| |
`-[7805]----+------ 0v
|
Supply - ---------+------------- -5V


does it make sense ? Would it be OK for the 7805 to sink current instead
of sourcing current, in the case of the 7805 in charge of the 0V supply ?

If this idea is garbage, what would be the recommended solution to this
problem ?

Thanks.

See alt.binaries.schematics.electronic for a (linear) circuit that will work
up to about 200mA on each supply with a minimum input voltage of 10.6V.

Bob
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