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Old 27th February 2007, 08:56 AM   #1
digi01 is offline digi01  China
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Default a study of DF control

there are lots of way to adjust a standard chip amp's performance such as snubber psu,regulated psu,zobel network,T network.
My project is adjust a chipamp's DF.So I can listening tube sound without tube?

Depiction below.
Click the image to open in full size.

Its a standard no-inverted amp.C2 is dc block cap that can be bypassed.K1 for set the amp's DF.there are three K1 switch positions:
K1 switch to 1,DF approach to 1.the amp just like a no feedback vacuum amp.
K1 switch to 2,DF approach to 10.the amp like a vacuum amp with feedback.
K1 switch to 3,the amp perform as standard chipamp.

just a rough idea,
Zang
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Old 28th February 2007, 02:47 AM   #2
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Interesting idea Digi....I wonder how well this would work for a guitar amp.
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Old 28th February 2007, 02:58 AM   #3
BWRX is offline BWRX  United States
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Another option could be to put a N-channel power mosfet between the speaker and ground and use a pot to adjust the gate voltage bias and thus the resistance of the mosfet. That would give you infinite variability.
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Old 28th February 2007, 03:05 AM   #4
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Any chance of showing the N-channel mosfet idea in a diagram? Thanks.
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Old 28th February 2007, 04:08 AM   #5
SY is offline SY  United States
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Pete Millett demonstrated an amp like this at ETF06 in December- a very neat idea. His was continuously variable, with a pot setting the ratio of voltage to current feedback.
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Old 16th March 2007, 08:38 AM   #6
digi01 is offline digi01  China
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sch file attached.

Zang
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File Type: gif dfc.gif (6.4 KB, 60 views)
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