My active preamp/tone-control and TL074 - Page 3

akis · 11th July 2009, 12:16 PM

I had a look at the schematic at the top and it appears strange. There is positive feedback on the two stages? How is that meant to work?

Also it appears we are presenting a 120K-ish resistance to the input source but only using 1/4 of it, 75% wasted. Then the tone circuit is grounded with a 750 R resistor right after it has come through 3K resistors at its best settings, how is that designed to work?

hipanni · 23rd July 2010, 03:29 PM

hi, this is kannan,

i need clear sound from stk ic. please give me your tone control circuits or any audio circuits. I am already used tda1524, ka2107,ka22233 ic and elliots project no 97, and three band tone control in different op amps but i am not satisfied.

teleman · 04:04 PM

The tone control circuit is already there in my post.use a Fairchild/Texas or any NE5532 IC only,which works far better on tone controls IMO. You may have to scale it up or down by changing the nework resistors & caps to get the required gain.

If you are not happy with the "tone control circuit you're using,then why don't you search for some on the web? There are plenty of them for the picking!

andrewlebon · 23rd July 2010, 04:07 PM

hey diyers
greetings tone control for my dx blameless mid base treble balance volume and mic input tlo72

thanking you
andrew lebon

nazirdigi · 26th February 2011, 05:46 PM

Quote:

Originally Posted by andrewlebon

hey diyers
greetings tone control for my dx blameless mid base treble balance volume and mic input tlo72

thanking you
andrew lebon

can u share tone control pcb layout in pdf format.

sasmit · 28th February 2011, 09:01 AM

you can have a look at my digital tone control also , everything works through a menu driven interface and using a single rotary control knob.

LM4780 paralell pcb

hipanni · 2nd March 2011, 05:54 AM

hi friends i want circuit diagrams

by
kannaa

hipanni · 13th June 2011, 01:54 PM

Quote:

Originally Posted by Mooly

The TL072 series is capable of trully excellent sonic performance.
With the very greatest respect I would suggest you need to look elsewhere in your audio setup.

hi, i have TDA 7294 amp. i need tone control for this amp. LM 1036 is not available in my city. TDA 1524 is noisy. so please send me true sound tone control circuits

23rd July 2010, 03:29 PM	#22
hipanni diyAudio Member Join Date: Jul 2009 Location: chennai	tone control hi, this is kannan, i need clear sound from stk ic. please give me your tone control circuits or any audio circuits. I am already used tda1524, ka2107,ka22233 ic and elliots project no 97, and three band tone control in different op amps but i am not satisfied.

23rd July 2010, 03:59 PM	#23
teleman diyAudio Member Join Date: Jul 2008	The tone control circuit is already there in my post.use a Fairchild/Texas or any NE5532 IC only,which works far better on tone controls IMO. You may have to scale it up or down by changing the nework resistors & caps to get the required gain. If you are not happy with the "tone control circuit you're using,then why don't you search for some on the web? There are plenty of them for the picking! Last edited by teleman; 23rd July 2010 at 04:04 PM.

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11th July 2009, 12:16 PM	#21
akis diyAudio Member Join Date: Jul 2008	I had a look at the schematic at the top and it appears strange. There is positive feedback on the two stages? How is that meant to work? Also it appears we are presenting a 120K-ish resistance to the input source but only using 1/4 of it, 75% wasted. Then the tone circuit is grounded with a 750 R resistor right after it has come through 3K resistors at its best settings, how is that designed to work?

28th February 2011, 09:01 AM	#26
sasmit diyAudio Member Join Date: May 2006	you can have a look at my digital tone control also , everything works through a menu driven interface and using a single rotary control knob. LM4780 paralell pcb

2nd March 2011, 05:54 AM	#27
hipanni diyAudio Member Join Date: Jul 2009 Location: chennai	hi friends i want circuit diagrams by kannaa

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