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I have a short ( i think) and don't know where to start
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alanb:
There is nothing between the diodes and the caps to limit the current. The caps are very large and therefore at start up the current is going to be high. Could this be the cause of your troubles rather than a short?
xavier60:

--- Quote from: alanb on December 18, 2018, 01:50:07 pm ---There is nothing between the diodes and the caps to limit the current. The caps are very large and therefore at start up the current is going to be high. Could this be the cause of your troubles rather than a short?

--- End quote ---
Also, fast recovery diodes usually don't tolerate current surges as well as standard diodes.
Hextejas:

--- Quote from: alanb on December 18, 2018, 01:50:07 pm ---There is nothing between the diodes and the caps to limit the current. The caps are very large and therefore at start up the current is going to be high. Could this be the cause of your troubles rather than a short?

--- End quote ---
I still have a problem. When I wire up both sides, I blow the 3.15a fuse. I can power either side but not both.
I am wondering if I have too large a transformer for the fuse.
The spec called for this :

Avel Lindberg Y236651 250VA 18V+18V Toroidal Transformer

And I have this:
Avel Lindberg Y236803 500VA 35V+35V Toroidal Transformer

Could  I be overpowering the fuse ?
I wired a meter into the circuit to see what kind of current was being pulled and it blew a 10amp fuse in the meter.

So, how could I slow down the initial rush of current ?
alanb:
A resistor in series would limit the current this will waste energy as heat although this may be acceptable. You could also use a thermistor this would also waste energy but using the correct value would waste less than a normal resistor as the resistance drops as it warms up.   
james_s:
When you say "wire up" do you mean when you put a load on them? Or when you just hook something up to them? If connecting wires blows the fuse then it sounds like you're missing the insulators between one or more power transistors and the case.
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