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livenicely 7th November 2010 05:09 PM

TDA1554Q Project
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I have TDA1554Q in my hand. Lets start to build it as 12v amp. I have both metal film and polyster capacitors of value 220nf for input and ceramic and metal filim for decuopling. The diagramme is here. Any suggestion.

kroto 8th November 2010 04:56 AM

share mine
C_in : 470n
Gnd signal lifted with 4R7
33k + 47u for muting delay.
C ripple rejection 470u.
Vs ~ +16Vdc

livenicely 8th November 2010 05:45 AM

Please send me your schematic in a paper plz and r u satisfird with sound

livenicely 8th November 2010 05:45 AM

and plz PCB

kroto 8th November 2010 02:48 PM

a little bit different scheme, but similar: (I've no drawing tool at now)
R1 = 33k (with 22k I'm still hear thumb)
C4 = 47uF
C3 = 470uF
C6 = 4700uF
input Ground and pin #3 were separated with 4R7 from the main Gnd (pin #7 and #11)

on my pic, you might be wondering why there is a lot of resistor arround the input (and two jumper). at the time I design the layout, I'm just thinking about the flexibility of the amp to be used as single-ended / bridged nor bridge-parallel(if possible) with additional component in the output line.

the sound is good, the guitar seems moore "fat" than my LM1875, although not as clean as LM1875. Bass is also tight.

sorry for the PCB, it's a hand made (you can see it from the silk and the text :p).


livenicely 8th November 2010 05:12 PM

Thank u so much but ur pic is not shown

livenicely 8th November 2010 05:17 PM

yea i can see ur pic in other browser thanks

livenicely 8th November 2010 05:20 PM

I cant under stand about pin#3. Wot do u want to say. According to my understanding u want to say that the pin #3 is attached to ground with 4.7K resistor????

livenicely 8th November 2010 05:21 PM

what is the value of C1 C2 and C5 Plz

kroto 9th November 2010 02:11 PM

I mean pin #3 (signal ground) and the input ground did not connected directly to main gnd, but via 4.7 Ohm resistor (not 4k7).
C1-C2 : 470nF
C5 : 100nF

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