Re: Stepper power supplies, unregulated

Mariss,

Your answer is precisely WHY I didn't "publish" a formula.
As I said, the reason for the "bleed" resistor is to meet a safety
standard of a certain voltage(or less) in a certain time frame (about
1/2 minute). NOT to "fully discharge" the cap! The 10k value DOES
this, in my application...

The drives ARE still connected at power off and modify the results
over a simple R/C equation. That is why I suggested an empirical(try
it and see) approach.

Hope this helps.

Ballendo

>A 10K resistor really does not make much of a difference. The RC
>time constant would be 10,000 times .04, or 400 seconds. 3 time
>constants would be considered discharged (5% of original voltage)
>for a total time of 1,200 seconds. That is 20 minutes.
>Mariss