TDA2008 and TDA2003: same PCB ?

[Peters8]

Hi guys😉
A simple question: I've a pcb for TDA2003...could I use it to mount a TDA2008 instead of the TDA2003?
I would use it with a transformer + rectifier circuit.
Thank you so much in advance for the patience!😉🙂
Regards

 

[JonSnell Electronic]

As they are basically the same chip, yes.

 

[Peters8]

thank you!😉

 

[Peters8]

By the way...Just for curiosity🙂: is the TDA 2008 a chip from the (late) 70's, from the 80's or from the 90's?
Thank you in advance!
Regards😉

 

[Peters8]

Hi!
Please guys, I need your opinion before I purchase item in the picture below:
The question is the following:

if I replace the two original TDA2003 (on the amp board of the picture below)with two TDA2008, does it work? or could I have problem doing this ICs change?😕
Please help me!
Thank you in advance😉
Regards!

 

[Peters8]

Hello again!
I hope to not bother you, but I need some advice more!😉
If you see the picture, you'll notice two 1000uF capcitors (the biggest ones): they're the output coupling capacitors.
My question is: Can I get a low frequency increase if I replace them with two 2200uF capacitors?
And just a last question: I'll feed this amp board with a 18V power supply (so it will be 25 V after the rectifier circuit)...Have I to change other elements on the pcb ( a part of the Volt values of the electrolitc capacitors)?
Thank you so much for your kindness!🙂
Best regards

 

[dannyjmf]

My question is: Can I get a low frequency increase if I replace them with two 2200uF capacitors?

yes... replace it with higher capacitance will allow for lower frequencies ... you can try to use up to 8200uf capacitor

 

[dannyjmf]

Hello again!

And just a last question: I'll feed this amp board with a 18V power supply (so it will be 25 V after the rectifier circuit)...Have I to change other elements on the pcb ( a part of the Volt values of the electrolitc capacitors)?
Thank you so much for your kindness!🙂

Just make sure to upgrade those electrolytics caps to 35V or 50V. Thats it and make sure not to exceed the chip maximum voltage

good luck

 

[Peters8]

Thank you Dannyjmf for your reply!🙂
ust a last question: don't you think 8200uF are too much for this old IC?
I'm sorry for my ignorance but I'm still a newbie!😕
thank you again😉

 

[mjf]

If you see the picture, you'll notice two 1000uF capcitors (the biggest ones): they're the output coupling capacitors.
My question is: Can I get a low frequency increase if I replace them with two 2200uF capacitors?
And just a last question: I'll feed this amp board with a 18V power supply (so it will be 25 V after the rectifier circuit)...Have I to change other elements on the pcb ( a part of the Volt values of the electrolitc capacitors)?

......yes,2200uF makes sense with a 4 ohm load.
..........a psu with 18Vdc (after rectifier) would be recommended.
why not look into the datasheet?
ST Microelectronics - datasheet pdf

 

[Peters8]

Thank MJF!
I've already read the TDA2008 datasheet, but, since I'm a newbie, I've still have some dubt.
For this reason I've asked for your help.
😉
Best regards

 

[meik65]

Hi,

as you can read in the datasheet the frequency response of the circuits is 40 Hz to 15 kHz
which isn`t up to date, they were designed for Lo-Fi use in cars or cheap cassette recorders. The output capacitor together with the 4 or 8 Ohm speaker are building a high pass filter to reproduce a frequency of 40Hz you need a capacitor of 950uF with a 4 Ohm speaker or a cap of 500 uF with a 8 Ohm speaker. That means a 1.000uF as in the datasheet will do the job.To have a little headroom and prevent aging issues you can use 2.200uF but 8.200uF doesn't make sense the circuits aren't capable of reproducing this low frequency on the output. I fyou only want to play around with the board using the TDAs is OK, but there are much better integrated amps to buy for little money , i.e. LM3886 or TDA7497 both classic AB amps and not class D.

 

[Peters8]

Thank you Meik65!
Your help is very precious to me!
Regards