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Old 7th May 2012, 07:37 PM   #71
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Ok i replaced the 701\702C in new one
and test again both chanel allmost identical with slightly change i think it is normaly and verery thing ok ,
I waiting to relay board kit , after that I will uplaod video to youtube

thanks every one may god bless you
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Old 8th May 2012, 06:27 AM   #72
Mooly is offline Mooly  United Kingdom
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It's common for volume controls to mistrack at very low levels. If you work the difference out as a figure in db's then it looks much better. Even the 45/60 low level result is better than 2.5db matching. The 70/80 result just over 1db mismatch.

Good channel matching in pots is a problem even today and one reason why pots such as ALPS are often used... but it comes at a price.
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Old 8th May 2012, 06:31 AM   #73
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eventualy it was the volume control , the balance is ok .
I order a new one from ebay
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Old 8th May 2012, 06:43 AM   #74
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That's good
Thanks for the update.
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Old 24th November 2012, 03:47 PM   #75
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hi all , well the the preamp is woorking good until now
i want to add to it "Bass Boost "
you know how is the best way to do it ?
i want the the bass ' tight ' and ' strong '

thanks
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Old 24th November 2012, 05:59 PM   #76
Mooly is offline Mooly  United Kingdom
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You can't easily modify this to give a boost to just the lower frequencies, it needs a major reworking. Something like this kind of thing maybe,

Stereo Preamplifier with Bass-boost - circuit diagrams, schematics, electronic projects
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Old 24th November 2012, 06:06 PM   #77
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It is very complicated and diferent from my op preamp
you have maybe example of bass boost that is simple but accurate ?
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Old 24th November 2012, 07:01 PM   #78
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Not really... that's about as simple as you can do it I'm afraid. I can't just think of anything else.
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Old 24th November 2012, 07:21 PM   #79
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ok thanks molly ,but i didn't understand how to modify my preamp .
can you please draw it ? thanks .
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Old 25th November 2012, 09:04 AM   #80
Mooly is offline Mooly  United Kingdom
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You can't just "modify" it to do what you want. It's a either a total redesign or an add on circuit to go before or after the preamp. To boost just the bass and leave the mid and treble alone needs an active circuit using opamp. You can't do it by just adding a couple of parts to the existing design.

Here's another one,
Bass Booster

they are all based on the same principles.
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