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Old 13th January 2004, 08:40 AM   #1
Dxvideo is offline Dxvideo  Turkey
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Default Big trouble with TDA1524! Pls HELP..

Last weekend I built a TDA1524 based tone control circuit ( I use Philips reference design). But it was absolutely fiasco! I cannot get any pot over mid level... When I get any pot to upper level it appears a big noise on speakers and no music! While they were %10-%50, the sound was clear. What's the problem? Did I make a mistake? Or the circuit is mistaken?
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Old 14th January 2004, 09:30 AM   #2
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Noone knows?
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Old 14th January 2004, 04:03 PM   #3
GregGC is offline GregGC  Canada
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Quote:
Originally posted by Dxvideo
Noone knows?

It looks like it. Check all your connections and wiring.

Sorry, not much help.
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Old 16th January 2004, 03:48 PM   #4
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Default RE:

I have used these chips and usind one of TDA 1524 in a tone control my experience suggets firstly you should re-check pcb design, connections etc if things don't work out try changing the CHIP itself.
but basically these are very slick chips there is serious problem with their Bass control, loudness button and olume control try alternates like building a tone control along something like TL 074.
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Old 17th January 2004, 08:02 AM   #5
Dxvideo is offline Dxvideo  Turkey
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I already checked PCB and other connections. And I changed the chip ones. But as I can see in TDA1524s datasheet, it amplifies the signal @22dB! with full volume... At full volume the pot sends 4.5v dc to chip. And it makes 22dB. But if I can limit to 2.5v, the gain reduces to 3dB. Does it cause the problem?
In fact, I must use this chip to remote volume control (by wire). Do you know an alternative wired remote control (a simple way pls)?
Thanks.
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Old 17th January 2004, 02:51 PM   #6
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Default Re:

I would ve if I could find the problem, however since I am unable to locate the problem only thing I could suggest is usage of alternate chips like LM1036.
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Old 19th January 2004, 07:02 AM   #7
Dxvideo is offline Dxvideo  Turkey
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Thank you very much for your assistance. But as I know, LM1036 cannot handle over 500mV signals (or it can handle but it makes distortion at this situation)...
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Old 20th January 2004, 07:03 AM   #8
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Default use an input signal divider

use a divider on each input.
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Old 20th January 2004, 01:18 PM   #9
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I will try! Does that reduces to 1/10 of input sensivity?
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Old 21st January 2004, 10:02 AM   #10
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Yes it does!

The audio source has it's own noise, no matter the signal level.
TDA1524 will amplify both noise and signal.
I hope you can adjust the input volume of youre audio source.
Please be more specific about what is your source signal (cd-player, PC etc.).

I use the same circuit in my amplifier and I had the same problem.
The divider worked like charm!
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