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Old 2nd October 2012, 04:30 PM   #1011
syklab is offline syklab  Hong Kong
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Can anyone help to explain what went wrong with my Fetzilla? the fuse didn't got blown, only R22 and R24. What could be drawing a large current that will cause this? I check at the PCB and cannot locate if there is any component had shortened. What should I check next time when I power it up after replacing R22 and R24?

Thanks
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Old 2nd October 2012, 04:49 PM   #1012
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Maybe wrong trimmer position during first power-on?
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Old 2nd October 2012, 05:17 PM   #1013
syklab is offline syklab  Hong Kong
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Originally Posted by smartx21 View Post
Maybe wrong trimmer position during first power-on?
Trimmers were set and check during the initial test before moving to the case.
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Old 2nd October 2012, 07:28 PM   #1014
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Were's Hugh?

Haven't seen him for some time now

Do
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PREAMPs : AMB α10 + JC-80 clone | Balanced DCB1 | LDR3x | AMPs: AMB β24 | Aleph 5 | VSSA | ML-2 | Fetzilla | Telos 390 Clone | My_Ref FE
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Old 2nd October 2012, 07:55 PM   #1015
Mooly is offline Mooly  United Kingdom
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Originally Posted by pinnocchio View Post
Were's Hugh?

Haven't seen him for some time now

Do
Hugh has been rather poorly these last few weeks but hopefully on the mend now.

I'm sure I speak for all in wishing him a continued recovery and hopefully we can look forward to seeing him back on the forums.
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Old 3rd October 2012, 11:12 AM   #1016
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Could you accidentally reversed the PSU connections. It happens to the best of us.
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Old 3rd October 2012, 11:54 AM   #1017
ncc is online now ncc
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Quote:
Originally Posted by syklab View Post
Can anyone help to explain what went wrong with my Fetzilla? the fuse didn't got blown, only R22 and R24. What could be drawing a large current that will cause this? I check at the PCB and cannot locate if there is any component had shortened. What should I check next time when I power it up after replacing R22 and R24?

Thanks
Hi skylab,

I got the same problem before. You could read my post at:

Fetzilla Build Documentation
Post #80 onward and see how I discovered the problem
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Old 3rd October 2012, 12:36 PM   #1018
syklab is offline syklab  Hong Kong
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Originally Posted by ncc View Post
Hi skylab,

I got the same problem before. You could read my post at:

Fetzilla Build Documentation
Post #80 onward and see how I discovered the problem
Hi ncc,
Thanks for the information ang Hugh had explained it well. I had made the exact mistake when I connect both channel to one transformer, I will replace the resistors and try again this weekend report back.

Thanks for everyone's help.
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Old 10th October 2012, 08:20 AM   #1019
AndrewT is offline AndrewT  Scotland
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Use a bulb tester for every power up of a new, or modified, mains powered project.
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Old 16th November 2012, 12:48 PM   #1020
rho is offline rho  Belgium
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I'm sorry if this is already made clear somewhere in the previous 101 pages, but I have a simple question about this amp: Is it designed to drive a 4 ohm load? Or can I drive a 4 ohm load when lowering the supply voltage?

Sorry for my laziness, but I didn;t feel like plowing trough 100 pages of replies to find the answer.
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