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Old 18th February 2014, 01:59 PM   #1771
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Take the amp to his place and check how well it drives those speakers.
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Old 18th February 2014, 03:47 PM   #1772
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Quote:
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Take the amp to his place and check how well it drives those speakers.
This amp is awesome. I have a pair of PSB Image B6 and they effing rock with this amp :-) It leaves nothing to be desired.
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Old 18th February 2014, 04:57 PM   #1773
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Take the amp to his place and check how well it drives those speakers.
Did you ever try the LM4780 parallel amp on those kind of speakers? And if yes, what was your opinion?

My idea is that with those quiet heavy to drive speakers the capacitance of your amp design might have trouble.
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Old 18th February 2014, 05:20 PM   #1774
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Never tried on such speakers. If I see speakers like those, I always recommend bi-amping
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Old 25th March 2014, 03:11 PM   #1775
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Dear All,

I've a center tapped EI core transformer with 18 0 18 secondaries.

Also, have rectifier PCB from audiosector - I searched on the forum and added 4 diodes and 3 jumpers to use with CT trafo.

The issues I've are that I'm getting a lot of variance in DC voltages.
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Old 27th March 2014, 06:12 PM   #1776
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Where is the CT connected to the board? you need to connect + 0 -
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Old 29th April 2014, 12:26 AM   #1777
Skwiddy is offline Skwiddy  United States
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Welp...I just finished my temporary wire-up of my amp kit and I'm experiencing an odd issue. But let me take one step back first. When I first powered her up the wire coming out of V- over-heated and went up in smoke immediately. I believe the culprit was a stray ground wire touching the V- tab on the amp-board. I rectified this issue and haven't experienced the problem since. The problem I am experiencing is that the power output from the amplifier is definitely low. If I had to estimate I would guess it's sounds about half as powerful as it should be. I've tried it on several pairs of speakers and at full volume the sound is still about as loud as a normal conversation (there is no distortion)

Some measurements

(Oddly) Led tabs are outputting 33 volts dc
Pg - v - 33 volts dc
Pg + v + 33 DC
Speaker Terminals .013 DC


Thoughts? I'm stumped. Did I miss something while assembling? Did the shorted wires damage something?

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Last edited by Skwiddy; 29th April 2014 at 12:31 AM.
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Old 29th April 2014, 09:01 AM   #1778
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Did it work OK between faults. Sounds to me like the short has blown the ICs.
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Old 29th April 2014, 04:24 PM   #1779
Skwiddy is offline Skwiddy  United States
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Originally Posted by barry.childs View Post
Did it work OK between faults. Sounds to me like the short has blown the ICs.
It was playing music (at the same low volume) when it shorted out. If the IC's are blown would they still be capable of playing music distortion free?
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Old 29th April 2014, 04:33 PM   #1780
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It was playing music (at the same low volume) when it shorted out. If the IC's are blown would they still be capable of playing music distortion free?
Unless the IC's are Chinese! or you have a wrong value resistor somewhere.
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