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Old 4th January 2013, 10:45 AM   #11
Aniket is offline Aniket  India
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I dropped that project and kept that board aside for a while, would check that later.
As i need the eq. urgently, i am constructing another circuit, as attached using TL074 opamps. I found the schematic on HiFiEngine, would update soon.

Hi, Gajanan, thanks a lot for the advice, as the chasis is grounded, no need to ground the potentiometers, hum is not present due to any grounding mistake,
maybe the schematic is wrong and need to rectify that.
As of now, I'm uploading both the schematics, advice is most welcome.

Regards,
Aniket
Attached Images
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File Type: pdf eq.pdf (225.2 KB, 35 views)
File Type: pdf 5bandeq2.pdf (177.8 KB, 40 views)
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Old 4th January 2013, 11:04 AM   #12
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1. Can you try your earlier 5 band Equalizer circuit with a circuit simulator like LTSpice etc. so that you might get what's going wrong with your mod?

2. How about using a project board/bread board like the following instead of the vero board/perf board at first to test, you could save money I guess. Just a suggestion.
http://www.diyaudio.com/forums/attac...read-board.jpg
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Last edited by csom; 4th January 2013 at 11:08 AM.
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Old 4th January 2013, 11:15 AM   #13
Aniket is offline Aniket  India
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Hi Som,

Yes, i would LTSpice my earlier mod sometime later for sure. vero board are really cheap here in Delhi and Gurgaon, cost only 25 Rs. I have never used bread board, and may be the are expensive here. I am good at soldering i find it easy to construct on a vero board.

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Aniket
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Old 4th January 2013, 12:30 PM   #14
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I am eager to know about your progress and the result with this ongoing 5 band Eq project.

Please do keep us informed about your "YAY!".

Wish you all the very best.

Thank you.
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Old 12th January 2013, 02:52 PM   #15
Aniket is offline Aniket  India
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New eq. working great, nice control on each frequency band, no hum, hiss, dead quiet, crystal clear sound. Here are a few pics. I would also mention that I changed value of C10 to 0.01uF instead of 0.001uF as in the schematic for 13kHz frequency band, with 0.001uF there was no cut or boost, but working brilliant with 0.01uF.

Regards,
Aniket
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Old 12th January 2013, 02:55 PM   #16
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Very nice! congrats!
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Old 6th June 2013, 01:49 PM   #17
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Hi Aniket,
I want to make an equalizer using some left over TLO74s. But I found that some parts are illegible in your uploaded reference. Could you kindly post your modded, simplified and tested circuit so that I can follow it?
Eagerly awaiting your reply.
Thank you.
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Old 9th June 2013, 03:49 PM   #18
Aniket is offline Aniket  India
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Hi csom,

please tell, how many bands you require??
the circuit which I am currently using is a 5 band eq. using all TL074's. and it's working great.
how many frequency bands you require, please elaborate your needs, i will help.

Regards,
Aniket
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Old 9th June 2013, 03:56 PM   #19
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Hi Aniket
I need a 5 band eq to fix an old amp. So it would be great if you could give me a 5 band using TLO74 since I have some unused TLO74 chips with me.

Thank you so much
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Old 9th June 2013, 04:35 PM   #20
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Kindly include the power supply section too. And If you have made a pcb for that please share at your convenience.
Thank you
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