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Old 4th December 2012, 10:17 AM   #11
basi is offline basi  Croatia
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Becasue T version must be isolated from Heatsink if Heatsink is grounded.
Ako imaš tf verziju onda dobro postoji ona plastična izolacija već na njemu.Pozdrav i sretno.
Less is more!!!
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Old 4th December 2012, 10:18 AM   #12
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It's hard for me to visualize exactly what you had connected, but it sounds like the short was far ahead of the amps so they should be okay. Here's hoping.
It is error only, and not truth, that shrinks from enquiry. - Thomas Paine
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Old 4th December 2012, 01:15 PM   #13
AndrewT is offline AndrewT  Scotland
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Originally Posted by iggy111 View Post
Ahhh, for Christ sake...
In my hurry to get the amp working, I forgot there is a difference between a CENTER TAP and DUAL SECONDARIES trafo.
Yup, I hooked up a CT trafo to both rectifier bridges by connecting its GND to both...

Now I'm going to try to connect it as in this pic, hoping I didn't fry the amps:

Click the image to open in full size.

Let the young ones learn from this (he said knowingly)
Once again, the mains bulb tester would have prevented this mishap getting through !!!!!!!
Another unhelpful post of mine, because Members won't read.
regards Andrew T.
Sent from my desktop computer using a keyboard
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Old 4th December 2012, 01:22 PM   #14
iggy111 is offline iggy111  Croatia
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And it's working ))
So I removed the 4 diodes and hooked up everything as in the pic, and now it works. Still have to solder the inputs and outputs again before I test it with some cheap speakers...

@AndrewT - you're right, but I was too anxious to get it going that the bulb tester seemed like another project Will DEFINITELY build it before any other project! I swear!
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Old 4th December 2012, 05:06 PM   #15
iggy111 is offline iggy111  Croatia
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Location: Zadar, CRO
Ok, so just to finish this topic and move on - my amp now works fine, the problem was in using center tap (CT) trafo and not doing the necessary changes in the psu. The fuses kept blowing but luckily nothing else was damaged.

After the changes (desoldering the 4 diodes and connecting the trafo differently) everything works fine. Tested with speakers and all
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