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Old 30th March 2013, 03:14 PM   #21
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Foxyrick, that sounds like it could work. The nice thing about this circuit is simple and easy to work with, frequency and gain adjustment are completely independent, and is tolerant of an imperfect layout.
I recommend you download the zip file of the circuit I posted (you can get TI Tina software here if you wantSPICE-Based Analog Simulation Program - TINA-TI - TI Software Folder), and just mod and tweek it however you want.

Mike
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Old 30th March 2013, 04:04 PM   #22
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Thanks for the reply Mike.

I've just drawn it up in Isis, with my modifications, and it simulates perfectly in Proteus.

Looks like you've given me my loudness control - thank you!

Rick.
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Old 24th August 2013, 09:26 PM   #23
davym is offline davym  Scotland
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Having read this thread I have to say I agree totally regarding tone controls, I miss them badly! Congrats on your design, I think you have contributed something important here. I would like to build it myself at some point and was wondering what type caps you used etc, it may be beyond me as a novice but I would like to have a go. What voltage do the op amps require?do you have a PSU schematic I could check out. Sorry if I'm asking daft questions here.

Cheers

Davy
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Old 25th August 2013, 10:12 AM   #24
Mihkus is offline Mihkus  Estonia
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I had fancy computer software...
I had chance to add boost to any frequency with 0,01 Hz precision
But i cant remember how it was called... damn!
I was able to turn crap speakers into flat response Hi-End ones
The coolest thing was peak of 50dB boost at lower fq witch turned my 12" into 50"
Flat from 20-70 hz, good times...
And now... I hate my computer sound...

Does anybody know where i can find similar one?
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Old 25th August 2013, 12:09 PM   #25
davym is offline davym  Scotland
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I had that dream once too

Personally any of the pc equalizers I have tried made everything worse, things are improving with pc audio, but the pace is too slow for my liking

I want non-invasive tone controls which I can fit in a preamp case so it will also help with my old UK pressed vinyl records with their boosted mid range.
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Old 25th August 2013, 05:21 PM   #26
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Hi Davy,

Sorry it took so long to reply, I was pleasantly surprized to see this thread come back to life agian.
I'm not reallty into the whole "botique parts" thing, so any good quality components from known to be reputable suppliers is what I generally recommend using. Any decent polypropylene or mylar type film cap is just fine here as long as it has a high enough working voltage, say 25 volts or higher for a minimum, and should be the tightest tolerance you can find, no more than +/- 5% (I buy a lot of 2% to 3% tolerance caps from DigiKey).
As for supply voltage, the usual regulated +/- 15 volt source will work fine here.
Attched are the schematics for the current version of the tone circuit and an appropriate regulated power supply.
I recommend using either an OPA2132 type Opamp like in the early version, or even better, use one of the LM4582/LME49710 types as in my current version. Those chips have better than average specs, are relatively forgiving of less than perfect circuit layouts, and better than average output drive capability that this circuit needs.

DIY TONE.JPG

DIY PS.JPG



Mike
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Old 25th August 2013, 06:50 PM   #27
davym is offline davym  Scotland
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Thanks Mike, that's a great looking circuit. I know it can be done on strip board but a pcb would be better for novices like me, wonder If we could persuade someone to make one. I think it's probably beyond me right now but i'm definitely going to keep it in mind for a later project, maybe next year if my budget allows.
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Old 25th August 2013, 07:36 PM   #28
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You're welcome Davy.
The first one I built was on plain perf-board, wired point to point on the bottom side, and it worked fine with no issues in spite of being a prototype built with junk box parts.
This is actually just one part of a much larger project that I've been working on. I will be posting more related to that in the not too distant future as things progress.

Mike
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Old 25th August 2013, 07:47 PM   #29
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Oh yeah, I almost forgot, as posted the circuit has a gain of 2 (6dB), for other gain values adjust the 10k resistor at the input (between the 10uF cap and the first opamp), 20k will give unity gain (0db).

Mike
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Old 25th August 2013, 08:11 PM   #30
davym is offline davym  Scotland
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Nice one Mike! I'll look out for further posts.

Davy
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