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Old 17th March 2006, 10:49 AM   #1
duffy is offline duffy  New Zealand
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Join Date: Nov 2004
Location: Auckland
Default Reg problem /help!

I'm sure this is a total stupid question, but

I've made simple MOSFET regulator as per:

It's bipolar using IRFP240/IRFP9240 and I am wanting +/-35V regulated. My problem is that my output voltages are the same as my input voltages!

SOURCE 50.6V Bad!
DRAIN 50.6V Good!
GATE 38.8V Good!

I've 10x checked connections and joints, and am sure that it is per diagram (I know I am wrong here!), the only changes are: higher voltage drop which is intended, and that it is driving into snubbed 6800uF caps.

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Old 17th March 2006, 10:54 AM   #2
eLarson is offline eLarson  United States
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Join Date: Aug 2002
Location: Gaithersburg, MD
Are you absolutely sure you have the gate, drain and source sorted out?

Do you have any other devices you could substitute?
Would a woodchuck bother to chuck MDF?
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