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Old 23rd March 2012, 06:45 PM   #21
Igla is offline Igla  Slovenia
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Hi pra3718;
This is how I've done a bass boost on one of my gainclones. It's working fine. The bad thing is, that the DC offset on the output got higher so I had to put back the capacitor from negative input to ground.
Regards
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Old 24th March 2012, 11:56 AM   #22
pra3718 is offline pra3718  India
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I am not expert but I would use input cap.
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Old 24th March 2012, 12:20 PM   #23
AndrewT is offline AndrewT  Scotland
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No DC block on input
No DC block on the NFB loop
No RF attenuation
No local decoupling.
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regards Andrew T.
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Old 25th March 2012, 10:56 AM   #24
Igla is offline Igla  Slovenia
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It's just a simple schematic to show the bass boost.
If the source is DC coupled you don't need the cap at the input of your gainclone.

I have attached the real schematic of my ''bass boost'' GC.

My other GC has no bass boost, no input cap, no RF attenuation, no zobel filter at the output and no DC block on the NFB loop. It only has local decoupling 1000uF caps on power pins. It's just like all the other stripped versions of the GC on the net. It has max 35mV of DC at the output and I can hardly believe this will kill my loudspeakers.

Input cap and the cap on negative input to ground have big impact on sound and once I've removed them I'm not going back.
Just try it and see. But first measure DC offset at the output before you connect the loudspeakers.
Regards
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Old 25th March 2012, 01:27 PM   #25
pra3718 is offline pra3718  India
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Quote:
It only has local decoupling 1000uF caps on power pins
I believe in adding 100nf additional.

Quote:
Input cap and the cap on negative input to ground have big impact on sound and once I've removed them I'm not going back.
Yet, I can use good quality cap for no risk.
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Old 25th March 2012, 01:57 PM   #26
Igla is offline Igla  Slovenia
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I don't believe in adding small caps. Newer worked for me.

Yes indeed; you can use whatever cap you think sounds best for you.
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Old 25th March 2012, 04:13 PM   #27
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hello kuldeepsingh i have shown u my diagram
how much power supply i should use for it.
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Old 25th March 2012, 04:25 PM   #28
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as mentioned i nthe circuit diagram, +- 28 V @ 5 amps would be fine for 8 ohm speakers.. for 4 ohm, reduce power supply to 22 V @ 6 A
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Old 25th March 2012, 04:27 PM   #29
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but i my circuit 18v/2amps give what to do?
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Old 25th March 2012, 04:34 PM   #30
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buy a new transformer ... another 300-400 Rs investment
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