Calling all electronics gurus! Need help with DC supply design.

[dnar]

Hey Tony, just to get a grip on the actual scanner power requirements, I did a little test tonight with a set of DT30's.

I fed the scanners with a tone source (sine and square) and measured the scanner current using a 0.1ohm resistor on the PSU DC common line. The following scope shots are as follows:

Ch A (yellow): Drive signal (X & Y)
Ch B (cyan): PSU current, 1mV = 10mA

Square wave 1kHz: Peak 132mV = 1.32A (50% duty on each rail)


Sine wave 1kHz: Peak 100mV = 1.00A (50% duty on each rail)


I would suggest the +/-24 PSU supplied with DT30's has little to spare in terms of reserve. This being the case, you really need to ensure your solution provides a minimum of 1A on each 24V rail.

This is the first time I have fired the DT30'd up, man they get hot quick when not bolted to a heat sink/plate!

[taggalucci]

Hi Wayne, that info's great Thanks for taking the time to do that.

[dnar]

Hey Tony, I stumbled on this supply today, not sure if the size is too big for you but the rails and cost are favorable. Not to mention it's local. $19.

+24V @ 3.5A
+12V @ 3A
+5V @ 1A

Not enclosed, but you could fold a mesh screen around it.

http://secure.oatleyelectronics.com/...8fca3c54923108