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Old 20th April 2017, 08:23 AM   #2201
AndrewT is offline AndrewT  Scotland
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I think you are referring to the (medium frequency) local supply rail decoupling.
Make sure you implement the high frequency local supply rail decoupling, as described in the chipamp datasheet.
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Old 25th June 2017, 08:07 PM   #2202
chuck55 is offline chuck55  United States
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Is Peter Daniel still around?

I can not get a response at his sympatico address
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Old 26th June 2017, 01:27 AM   #2203
Peter Daniel is offline Peter Daniel  Canada
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Commercial Gainclone kit- building instructions Send a message via AIM to Peter Daniel
He's always around
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Old 28th January 2018, 10:53 AM   #2204
2Bak is offline 2Bak  Denmark
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I'm building another chipamp based on Audiosector boards.
Have already soldered 1.500 uF caps on the amp boards, and my intention was to use 10uF FCs on the rectifier board, however now I'm considering using 10.000uF Elna gold caps and snubber in the supply instead.
Should I then decrease the value of the caps near the chips, or will I be OK with those 1.500uF caps?
By the way this amp will include an X-10D tube buffer clone.
/Jan
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Old 28th January 2018, 02:54 PM   #2205
Peter Daniel is offline Peter Daniel  Canada
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You will be OK with 1500uF caps on amp board, but you can also use much smaller values, something like 100uF or so. That second option might be probably better, especially if you use more "exotic" caps.

OTOH, the stock configuration may be preferred too, so best is to compare all the options.

The PS board can hold large caps and snubber components.
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Old 28th January 2018, 03:16 PM   #2206
2Bak is offline 2Bak  Denmark
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Thanks Peter,
Some years ago I made another with 10.000uF and snubber, and there I used 250uF at the chip. But I'll give it try with those 1.500uF FC + the large Elna caps.
Best Regards
Jan
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Old 10th March 2018, 04:33 AM   #2207
muimui is offline muimui  Canada
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Default QUAD ESL 57

Hello
Has anyone tried the Gainclone amp with QUAD ESL 57 electrostatic speakers? Thanks
Muimui
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Old 31st March 2018, 02:22 PM   #2208
polaron is offline polaron  France
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Hello, I am back to gainclones
I recently builded an audiosector kit and one point by point, both around the LM3875 chip
I am using a tube buffer at the input and two 10k tocos pots

after an hour or so of music, pafff!!!
I have to run like crazy to decrease the vol pots, before my speakers get kaput
a big noise, woofers at maximum excursion, big panic!!

please help, what can I do? heeeeelpp!!
thank you!
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Old 31st March 2018, 04:23 PM   #2209
Peter Daniel is offline Peter Daniel  Canada
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Post some pictures of your build. You had excessive DC output at the amp.
Hard to advice without any additional details.
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Old 31st March 2018, 05:29 PM   #2210
polaron is offline polaron  France
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Hi Peter,

Excuse for the mess,,,
This is an experience, before to make my final version, whose photos I'll publish here,,,


So my speakers are slowly cooking,,,
I followed what I drawed, please see my draw

from pot :
1 goes to power ground between caps
2 goes to 220r (amp, in)
3 goes to power ground, on top of 680r - should this one go to pin 8, directly?
positive rca goes to 3 from rca to pot

Album photos GC LM3875-Tocos version - Casimages.com
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