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GHOST in 3 band graphic equalizer!! SOS!
GHOST in 3 band graphic equalizer!! SOS!
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Old 23rd December 2012, 08:42 AM   #21
pinkmouse is offline pinkmouse  Europe
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GHOST in 3 band graphic equalizer!! SOS!


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Old 23rd December 2012, 08:57 AM   #22
csom is offline csom
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I'm sorry again Pinkmouse and thank you so much
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Old 24th December 2012, 11:45 AM   #23
epicyclic is offline epicyclic  United Kingdom
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Hi csom

check that pin 3 IC1A and the input connectors all have a ground connection as per (3 BAND EQ ) schematic .

Last edited by epicyclic; 24th December 2012 at 11:48 AM.
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Old 24th December 2012, 01:38 PM   #24
csom is offline csom
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Hi csom

check that pin 3 IC1A and the input connectors all have a ground connection as per (3 BAND EQ ) schematic .
Thank you so much Epicycle for your kind response.

I compared the schematic and the PCB I made.

They seem to be correct after I fixed my initial mistake as pointed out by Bobo.

But still I will check it again as per your suggestion and report you back.
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Old 28th December 2012, 11:25 AM   #25
csom is offline csom
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Hi csom

check that pin 3 IC1A and the input connectors all have a ground connection as per (3 BAND EQ ) schematic .
You are right!

It is finally solved now. I had to interconnect ground tracks. My bad mistake.

Now everything is working fine. I checked with output from cell phone, mp3 player, CD player, PC... all.

Thank you really so much

Wish you a happy new year
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Old 29th December 2012, 06:52 AM   #26
epicyclic is offline epicyclic  United Kingdom
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Thanks for the problem solved post

Glad you got it working
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