Basic Inverted Gain Clone

caw · 8th June 2005, 03:30 AM

Hello, i am a first time di your-selfer building an inverted gain clone. I finished the psu and one channel and decided to try it out so as not to double up on my mistakes on the second one.The psu is putting out 37 vdc each rail.When i powed up the LM3875t chips No1 terminal heated up and broke off,also leaving the backing plate to the chip heat affected.Could any-body give me some advice on how to rectify the problem please.

Thanks,Clive

bigmike216 · 8th June 2005, 03:58 AM

What were you using for a heatsink? Do you have V+ and V- reversed?

caw · 8th June 2005, 06:51 AM

The heatsink is a piece anodised aluminium 45x40mm with fins.I had the positive wire going to pin No1

caw · 8th June 2005, 06:51 AM

Just hooked every-thing up again, every-thing seems to be fine.Must have been a fractured terminan.I do get a reading of 16.4mvdc across the speaker terminals with a 10 ohm resister bridging them.Is that alright.
Much apreciate your help.Clive.

8th June 2005, 03:30 AM	#1
caw diyAudio Member Join Date: Jun 2005 Location: south coast nsw	Basic Inverted Gain Clone Hello, i am a first time di your-selfer building an inverted gain clone. I finished the psu and one channel and decided to try it out so as not to double up on my mistakes on the second one.The psu is putting out 37 vdc each rail.When i powed up the LM3875t chips No1 terminal heated up and broke off,also leaving the backing plate to the chip heat affected.Could any-body give me some advice on how to rectify the problem please. Thanks,Clive

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8th June 2005, 03:58 AM	#2
bigmike216 diyAudio Member Join Date: Jul 2004 Location: BC, Canada	What were you using for a heatsink? Do you have V+ and V- reversed?

8th June 2005, 06:51 AM	#3
caw diyAudio Member Join Date: Jun 2005 Location: south coast nsw	The heatsink is a piece anodised aluminium 45x40mm with fins.I had the positive wire going to pin No1

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