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Old 16th January 2010, 01:51 PM   #1
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Default Tone control circuit

OKI DOKI
this is the simplest tone control ever ...the particular also seems to have some gain also ....it doesnt get any simpler ...

Question 1
if a thing like that is made with the best available psu and the best available material can it be called an audiophile tone control ?? or simply to have a good quality tone control you need symetric psu and op amps .


Question 2

I have one Yamaha amplifier that uses a "passive tone control" that takes feedback from the aoutput to operate i presume that in this topology will be impossible to seperate preamplifier and main amplifier ( unless you keep the main amplifier operating to support the tone control and then take the signal from the amplifier input to drive another amplifier )

opinions please

thanks
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Old 16th January 2010, 05:00 PM   #2
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Originally Posted by sakis View Post
OKI DOKI
this is the simplest tone control ever ...the particular also seems to have some gain also ....it doesnt get any simpler ...

Question 1
if a thing like that is made with the best available psu and the best available material can it be called an audiophile tone control ?? or simply to have a good quality tone control you need symetric psu and op amps .


Question 2

I have one Yamaha amplifier that uses a "passive tone control" that takes feedback from the aoutput to operate i presume that in this topology will be impossible to seperate preamplifier and main amplifier ( unless you keep the main amplifier operating to support the tone control and then take the signal from the amplifier input to drive another amplifier )

opinions please

thanks
You need to make sure that the load is not too low, otherwise that will influence the curves.

jd
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Old 16th January 2010, 05:05 PM   #3
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OK GOT IT ....

is this regarding question one or question two ???
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Old 17th January 2010, 04:30 AM   #4
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Hi sakis

Yes I think janneman refers to question 2. Having the control in the feedback loop is not good. Each time you adjust the tone control your'e changing the working condition of the amplifier. The amplifier may measure good with the controls in flat position, however changing the setting of one of the controls, the amplifier got a new working condition which may result in higher TIM, IMD and changed FRC.........

Better to have the controls in the front end of the amplifier (preferably with a output buffer), where you can control the impedances
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Old 17th January 2010, 05:08 AM   #5
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Quote:
Originally Posted by sakis View Post
OKI DOKI
this is the simplest tone control ever ...the particular also seems to have some gain also ....it doesnt get any simpler ...
What about a cap and variable resistor to ground? 2 components - top cut only

Quote:
Question 1
................. can it be called an audiophile tone control ?? ......................

Can any "tone control" be called audiophile ?


Andy



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Old 17th January 2010, 05:41 AM   #6
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hello sakis,

im intersted to build this tone control for my amplifier, can i have the complete part name of transistor use? and if possible the pcb layout.PLS

Regards,
Ronald
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Old 17th January 2010, 07:31 AM   #7
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Originally Posted by poynton View Post
What about a cap and variable resistor to ground? 2 components - top cut only




Can any "tone control" be called audiophile ?


Andy



.
yeap ...i am with you but some times its needed so yea it has to be done as simple as possible


the transistor is bc 547 or 548 no pcb for that
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