Help building a power supply please

Sep 4, 2004 at 9:19 PM Thread Starter Post #1 of 4

Todd R

Headphoneus Supremus
Joined
Sep 27, 2001
Posts
4,224
Likes
139
I built this power supply today (Just the upper drawing, Not the 6v section)
I'm supposed to be getting +230vdc on my output, but instead I'm getting 337vdc
cmoy5_1e.gif

The only place I changed the circuit was to use 2-110uf caps (4 total) in parallel in place of each 220uf since they weren't available.
Any of you EE's out there know why my voltage is off? I'm pretty sure my rectifier is correct because the AC voltage is checking in the milivolts. (1 amp 400v ST ultra fast damper diodes)
Todd R
 
Sep 4, 2004 at 9:50 PM Post #3 of 4
Until you actually pull current out of the supply the caps
will charge to 1.4 times the input voltage. So actually up to
about 350 volts.
 

Users who are viewing this thread

Back
Top