Electronics > Projects, Designs, and Technical Stuff
I have a short ( i think) and don't know where to start
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AngraMelo:
Wait a minute, the circuit says you should use a 18V transforme and you are using a 35V one?
Your caps are rated for more than 35V?
I have waaaaay larger capacitor banks here that never had that problem.
They do make a fun noise when turning on but they dont blow any fuses (normally a slow blow fuse is needed)
Hextejas:
Hooray, I think that we got it !!!
I added a small ohm (2ohm) resistor, large Watt, I dont know what it is, to the schematic as shown and it seems to work ok. It's a very beefy resistor and it did not get hot after powering up.  :phew:
The power supply does not blow fuses and is putting out the proper DC voltages.  :-+
My question now is:
1) Should I add a similar resistor to the other rail ? Does it need to be "balanced" with the other side ? Is there such a thing as balance between the 2 sides ? This electronics hobby is a strange beast. :-DD

Picture attached.
metrologist:
I suspect that resistor is rated 2 watts, maybe 5W. Your transformer is rated 500W (input)?
Hextejas:

--- Quote from: metrologist on December 19, 2018, 06:55:22 pm ---I suspect that resistor is rated 2 watts, maybe 5W. Your transformer is rated 500W (input)?

--- End quote ---
Yes on the transformer.
And I spoke too soon. Alas.
I put another 2 ohm in front of AC2, plugged everything in, bolted it into the chassis, turned it on, and smoke and a gunshot.
 :palm: :palm: :phew:
Maybe adding the 2nd resistor caused it bu i am at a loss to explain it.
Soooooo , I will take out the resistor, replace the exploded diode and try again,
sokoloff:
If you're not discharging all the caps between tests, it's possible that a previous test has left some charge in the caps and the subsequent power-on is not the same test as a power-on from a "cold" (all discharged) state.

Adding the second resistor in that location did not cause the failure.
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