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Old 5th November 2011, 07:25 PM   #11
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Quote:
Originally Posted by afternath View Post
About resistors values in a op amp circuit, in general lowering values will lowering noise so what is the disadvantage of it?
Output loading and power dissipation mostly.
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Old 25th November 2011, 03:46 AM   #12
gootee is offline gootee  United States
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These guys are all giving you really-excellent and complete advice, and you should implement ALL of it.

However, before doing anything else, you must be sure to connect a 0.1 uF X7R ceramic capacitor from RIGHT AT each opamp power pin to ground, and parallel each of those with a 10 uF electrolytic that can be a few millimeters farther away from each power pin.

And you must put at least 100uF electrolytic in parallel with (each of) C7, C8, C16, and C17.

NOTE, too, that R19 and R20, as well as R16 and R9, should be connected VERY close to the opamp pins.
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Old 26th December 2011, 09:27 AM   #13
rho is offline rho  Belgium
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Have you made any progress on this?
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Old 26th December 2011, 10:22 AM   #14
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Thanks a lot for advices, but i will not be able to implement all of them because I used one tiny stripboard for left and right vol amp/pushpull circuit, so there is not enough space...

Otherwise, this amp sounds great with my AKG K702, clean sound and no problems at all.
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Old 6th April 2013, 12:07 PM   #15
xslavic is offline xslavic  Moldova
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Default Volume control pot buffer highs cut

hey aftermath does your volume control buffer works ok,no highs cut?
would you recommend this instead ?
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Old 6th April 2013, 04:36 PM   #16
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Quote:
Originally Posted by xslavic View Post
hey aftermath does your volume control buffer works ok,no highs cut?
would you recommend this instead ?
I used a 10k ALPS Audio Potentiometer for volume control and it works perfectly, very smooth and no scratch sounds.
The frequency response of my preamp is absolutely flat from 20Hz to 20kHz and above.
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