[sdiy] Re: stupid PSU!!!

[Tim Daugard]

----- Original Message -----
From: "mike ruberto" <somnium7 at gmail.com>
To: "KA4HJH" <ka4hjh at gte.net>; "Synth DIY" <synth-diy at dropmix.xs4all.nl>
>
>
> Anyway I'm rambling again. I really don't think the gear this PSU is
> for actually pulls a full load from it. I'd say they over-designed the
> unit and gave it extra headroom. Not to mention the fact that it is
> for powering a modular system which depending on initial size and
> options installed has a great deal of variability in power
> consumption.

I discovered problems with my power supply by adding modules to the system. The in rush
currents to all the bypass caps kept the power supply from being able to turn on properly
and regulate. I had to disconnect a string of modules and then when the rest of the
modules powered up and charged up, I connected the final string.

I solved the problem but building a bigger power supply (and making a slight modification
to the design of some modules).

You might want to add some large capacitors to your test load. If you but a resistor
inline with the cap, you should be able to control the in rush current to make up that
final .75 amps.

Tim Daugard
AG4GZ 30.4078N 86.6227W Alt: 12 feet above MSL
http://home.sprintmail.com/~daugard/synth.htm
http://home.earthlink.net/~synthfred/h_toctop.htm (Fred's online edition)