| Electronics > Projects, Designs, and Technical Stuff |
| I have a short ( i think) and don't know where to start |
| << < (9/13) > >> |
| 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. |
| Navigation |
| Message Index |
| Next page |
| Previous page |