[sdiy] Voltage regs + diode drops.

[Dave Kendall]

Many thanks to you all for all the replies.

It's a lot clearer now. Seems like it's do-able with care, and under 
certain conditions, but is not a simple bomb-proof solution.
(a bit like the answer to most things in life I suppose ! :-)


cheers,
Dave

>
> Is there any good reason not to use diodes in series after the output
> terminal of a positive voltage regulator to get odd voltages, eg. 2 x
> 1N4001 after a LM7809 to get just below +8V?
>
> It seems it *should* work, but I haven't seen it done anywhere yet. Are
> there any potential problems that anyone can think of?
> FWIW, It would be for a CMOS logic circuit, and with a single OP-amp or
> transistor level shifter on the output.
>