[sdiy] Re: Bypass caps

[Seb Francis]

surely having a current limiting PSU (e.g. with an LM 723) would just 
bring the voltage up as the caps charged?

seb


Harry Bissell Jr wrote:

> Just for the record (and noobs)
>
> another solution is to either
>
> Power one half the rack, then after a time delay
> of a second or so... power the other half using a relay.
>
> ~or~
>
> Power the whole system through some series resistors that limit the
> inrush current, then short across those resistors after a one second
> delay.
>
> This is how I did my system... but the 'brute force' larger supply is 
> a valid option
> too. Its more size and weight, less complexity.
>
> Engineering... ~make the choice~
>
> H^) harry
>
> */Tim Daugard <daugard at sprintmail.com>/* wrote:
>
>     From: "harrybissell"
>     .
>     >
>     What price failure ? More time is wasted by NOT using sufficient
>     bypass caps than is saved by not designing them in (in small
>     production runs). It is really hard to OVERDO the caps, unless the
>     power supply is unable to start because of the peak current :^P
>     >
>
>     Which happens, my system reached the point where the power supply was
>     adequete for steady stae use, but couldn't power up the system. I had
>     to unplug one row of modules from the power chain until the system
>     powered up. When all the other modules had charge their caps, the last
>     chain got pluged in. I finally solved that problem by putting in an
>     upgraded power supply - two modules wide with 3X the current
>     capability.
>
>     Tim Daugard
>     AG4GZ 30.4078N 86.6227W Alt: 12 feet above MSL
>     http://home.sprintmail.com/~daugard/synth.htm
>
>
>
>