[EFM] More Power supply questions

[Harry Bissell]

More current for more load. This DOES mean that if you have a small load,
the BIG
supply will have enough OOMPFH! to seriously fry things. So if you are
worried you can
put fuses in series with each supply of each individual module. They can be
rated just below the full supply current (which protects the power supply)
or chosen for the power draw of each individual module. This protects the
power supply and minimises damage to the module... But you need to know how
much power each module will use under ALL conditions including power up
(when all filter caps try to charge at the same time...)

There may not be a perfect fit for fuses... one big enough to allow the
power up or other peak loads may be too big to protect a smaller fault...
There ARE time-delay fuses (slo-blow) but they are usually not used in small
signal electronic circuits (like synth VCO, VCF, VCA...)

I'd go with two sets of fuses... One on the primary of the power supply (AC
side) to protect the unit from fire. And one on each supply output (+-15???)
to give some protection from a failed module.

(in real life I don't even fuse the individual outputs... the supply will
limit at the design current, and I'll smell something burning (like some
thin traces... resistor... chip???)

Someday ask me about the spectacular synth melt-down of 1975.... its a long
story.

H^)  harry

mitchell wrote:

>     So i guess what it sounds like is that you need more amps to run
> more modules. Do your modules need some sort of protection from all them
> amps? I am a begginer at all of this electronic stuff.
>     Another question: If some of my modules have a 12V regulators at
> their power connection can I run them from a 15V supply?
>
> Thanks
>
> --M