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Old 24th April 2006, 08:16 AM   #1
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Unhappy Gianclone not working

I built my first gainclone the other day and it didn't seem happy at all.

I think my error was not grounding the 0V point on the amplifier board (chipamp kit). The cable from the external PSU got really hot and I think the transformer has died (it's not giving anything out on the secondaries).

Am I ok to ground the amp correctly and plug in a new transformer, or is there anything else I should check?

Thanks in advance.
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Old 24th April 2006, 08:34 AM   #2
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Do you have any fuses to start with?
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Old 24th April 2006, 08:58 AM   #3
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Remove the trnsformer and check with a meter for any conductivity shorts..etc
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Old 24th April 2006, 09:20 AM   #4
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Yes I've got 2amp slow blow fuses on both the positive and neutral mains connections.

There's nothing coming from the secondaries despite 240Vac on the primaries (the fuses didn't blow...)

Thanks for the help guys.
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Old 24th April 2006, 09:34 AM   #5
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cHECK FOR ANY LOSE CONTACT IN PRIMARY WINDING OR CONNECT AN AMMETER IN SERIES WITH MAINS OR CHECK THE CENTER TAP SECONDARY SIDE..SORRY ABT UPPERCASE..
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Old 24th April 2006, 09:45 AM   #6
AndrewT is offline AndrewT  Scotland
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Hi,
maybe the lack of a zero reference caused the problem, but I am more inclined to think you have wired up the transformer to rectifier wrongly.

Can you post the schematic you are working to?
Maybe a pic of your assembly for comparison.
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Old 25th April 2006, 07:20 AM   #7
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This is the colour coding of the transformer connections. I wired them as follows (to the chipamp.com revision 3 rectifier board):

AC1 - orange
AC1 - yellow
AC2 - black
AC2 - red

Is the wiring correct?
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Old 25th April 2006, 08:55 AM   #8
digi01 is offline digi01  China
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Quote:
Originally posted by AndrewT
but I am more inclined to think you have wired up the transformer to rectifier wrongly.

agreed,I have meet the same issue when I use a mistake label transformer.the transformer is going hot and the rectifier pcb is smoking.
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Old 25th April 2006, 10:00 AM   #9
Fossil is offline Fossil  Singapore
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Without the '0' ref, there will be a DC offset at the output, right?
ANyway, it's always good practice to put a small fuse, 1 or 2A on the sec or PSU to limit the fault current for for testing purpose. Save the heartaches!!
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Old 25th April 2006, 12:00 PM   #10
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with secondary fuse disconnected CONNECT AN AMMETER IN SERIES WITH MAINS and measure trf no load current...
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