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Old 13th March 2011, 04:15 PM   #11
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Join Date: Dec 2010
tda1557q is 2 x 22 w... I need mono amp.. And i couldnt find anywhere on the web bridged version of this IC...
Ill keep searching for car and home amp chips untill i find something good for my 18-19 vdc supply...
Any other suggestions?
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Old 13th March 2011, 05:23 PM   #12
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Join Date: Feb 2011
tda 1557q has 4 amps inside, and they are bridged to form 2 amps.
The datasheet shows this to you.
and there is no need to use both of these bridged amps, you can run only 1 channel.

so, it is a good one for you.
alternatively, if you add a voltage regulator to your circuit, its dropout voltage will make sure you will not overvolt this chip.
It does indeed fit your powersupply.
this is a 5A voltage regulator.
And is adjustable.
Built it, set to say.. 15-16 volts.
Build the tda1557q according to :
page 8 of this
then you can use one channel. it is allready a bridged one.
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Old 13th March 2011, 06:25 PM   #13
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Ye , good point.. No need for 2nd speaker if one is more then fine...
Im gona build voltage regultor same as this one here
It should do the job
Gonna order the parts tomorow morning...
Hope ill get them in 2-3 days so i can start waisting some time soldering elements on raster board =)
Ill post my progress here
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Old 13th March 2011, 07:10 PM   #14
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Join Date: Feb 2011
i will be intrested.
the ic will need a heatsink, just like the regulator.
salvaged cpu heatsinks are superior for this.
if you can not drill a hole on them then try to salvage a dead computer powersuply.
You will find heatsinks in them, with pre-made holes. Absolutely nice

I will be intrested to see what you manage.
Allso, you should order a potenciometer for amp volume controll.
something at 50 K ohm (or so) will do just fine.
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Old 13th March 2011, 07:29 PM   #15
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Ye ofc... But there we go , first problem alrdy
I cant find lm338 here on Serbian market.. I found only one that lookls like hi quality one.. and it is not realy cheap.. around 9-10 euros :S
I dont want to have problems with heat so im not even thinking about voltage regulator of 3A... Going to look around for some other ways to decerese voltage for 3 volts... Or maybe a supplier of lm338 with some reasonable price...
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Old 13th March 2011, 09:53 PM   #16
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Join Date: Feb 2011
You are going to use only 1 channel, so i would think a 3a regulator will do fine.
Not to mention your load will be 8 ohms.

If you do consider this still a problem, then look for rectifier diodes in the range of 5A or more. Connect them in series, and voila. You get a voltage drop on eatch diode you connect.
You sayd You have 14 VAC transformator.
So suposedly it should be something like
(14*1,4) - 1,4 = approx 18 volts.
way too close to the safe limit.
Connect 2 diodes, and you drop the voltage to approx between 16-17 volts.
Not adjustable, but will work just fine, and its cheap too.
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Old 13th March 2011, 10:04 PM   #17
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High Current Voltage Regulation - Electric Circuit

this article can provide you with a lot of usefull info too, if you are intrested in getting a high current regulator, despite its not available in your country.
If you can link the site where you want to order parts, i might be able to help you pick things that worth a shot.
You could paralell connect 2 of the 3A regulators if you like, with ballast ressitors.
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Old 14th March 2011, 01:42 PM   #18
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Join Date: Dec 2010
Thanks Arty for ur suggestions!
I decied to do it with
DIODE P 600 , 1000V 6A
Gonna buy 6 of those... WIll be enough to drop voltage for 2 volts
Tell me plz where i have to put those diodes? After bridge rectifier on + rail or on both(+ and -)?
For start ill use all diodes in series, then gona remove 1 by 1 untill i got around 16vdc on the end of the circuit.
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Old 14th March 2011, 08:49 PM   #19
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Join Date: Feb 2011
After bridge rectifier on + railis where you put them.
Supposedly You should start with 3 diodes, that should be a safe approach.

I'mn glad i was able to help, please keep this thread updated
Despite its datasheet these TDA chips do not sound as bad as one may think.
Surely the 2050 or one of the LM series is superior, but if you find an ordinary car radio acceptible then this will allso be okay. Afterall, it WAS developt for that use.
Maybe one day You will run it as a stand alone amplifier. It is quite okay to run a smaller (isobaric prehaps) subwoofer with this amplifier.
It actualy does have good instantenious current ability, it would not be a problem for it to handle such loads.

Actualy my amp is based on tda1557q too. While my "design" is verrrry crude i em quite statisfied with it sofar.
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Old 14th March 2011, 11:04 PM   #20
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Ye i got ur point.. Well this is just fun project for me.. My next one amp will be hi fi for home listening... This one is just warming up =)
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