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Old 24th September 2012, 12:41 PM   #11
balerit is offline balerit  South Africa
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Kitax, I added a buffer to my TDA1557Q amp, actually I designed 3 boards around this chip (straight fwd amp, a sub-woofer amp and a surround sound amp), so as not to interfere with the output opamp of my cd/dvd player. The opamp also takes care of signal conditioning for the sub-woofer or the center and rear channels of the surround sound amp (TDA1558Q).
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Last edited by balerit; 24th September 2012 at 12:45 PM.
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Old 28th September 2012, 06:46 AM   #12
balerit is offline balerit  South Africa
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Originally Posted by Kitax View Post
well actually one of the reasons why i am going with the 8560 is because local dealer doesnt have 1557, but thanks for the advice anyways...
i am still hoping for the 3 answers
In answer to your questions: if you need to change the bass or treble then you would need a preamp otherwise a simple buffer will do. The circuit in the data sheet is fine but you need to add the delay circuit to prevent clicks when switching on and it runs fine on 12v. The 8560 is essentially a higher power version of the 1557Q, might even be an upgraded version of the old TDA1562. The thing though is what is your power source because the higher power chips will drain your battery quicker? If you want I can post my schematic of my amp just need to tidy it up.

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Old 28th September 2012, 08:29 AM   #13
Kitax is offline Kitax  Latvia
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well i would be happy to check it out... ^_^
so if i wanted a bass and treble tuner, i would have to get a preamp?
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Old 28th September 2012, 06:32 PM   #14
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well you can get away with a passive network for bass and treble.

allso, Balerit, 8560 is not an upgraded 1562. it is a 1557 upgrade, able to drive 2 ohms in bridge.
class B BTL chip.

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this will do as a pre-amp.
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Old 28th September 2012, 08:07 PM   #15
Kitax is offline Kitax  Latvia
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well the pasive one would decrease the volume a lot, if im right, but thanx for the link ^^
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Old 29th September 2012, 05:46 AM   #16
balerit is offline balerit  South Africa
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Quote:
Originally Posted by Kitax View Post
well the pasive one would decrease the volume a lot, if im right, but thanx for the link ^^
Well that's why I designed my amp with an input buffer, you can increase the gain if need be. If you have to add a preamp then use a TDA 7630 or TDA1524 and build a dedicated preamp. I use the TDA 7630 in my Camm EquiTone preamp and it is the best preamp that I have heard. I am currently building a new preamp to test the TDA1524 chip.

Arty I stand corrected on the 8560, the 1562 is an class H amplifier.

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Old 29th September 2012, 10:05 AM   #17
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Kitax, depending on the speaker You wish to drive, the decreased volume at -probably the mid- freqvencys will not mather at all.
even if so, most likely any decent opamp set with some gain will elliminate this problem.
Say TL082 is absolutely fine for this task.
It can be added later, and it can be run from 12V single rail.

But i would absolute like to ask what speakers are You going to drive with it?
i have a tda1557q amp driving 3 way 8 ohm speakers with a 7" bass unit and i don't even need quarter of its power. Allso i have a passive network to for BSC and bass "boost".
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Old 29th September 2012, 01:46 PM   #18
Kitax is offline Kitax  Latvia
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well i actually already made a amp with tda8560, and it sounds grate with 260W 4ohm speakers. unfortunatly a friend of mine burned the chip , by accidentaly sodering wrong wires togather (i asked him to change a rezistor) ... i have plans to change the chip on monday, after he gives it back to me.
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Old 29th September 2012, 03:11 PM   #19
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what resistor?
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Old 29th September 2012, 04:12 PM   #20
Kitax is offline Kitax  Latvia
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the 10k one, i didnt have one at the time so i put 4 2.7k rezistors. its from pin 12 to +12v
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