Upgrade for a TDA2003

[giralfino]

Hi all,
I would like to build a speaker for listen to the radio (FM).
I found this kit for a FM tuner with an integrated amp that is based on a TDA2003: FM Radio Receiver (1055)
I was thinking that the amp is not powerful enough so I'd like to upgrade the chip with another one more powerful: can the TDA2003 be replaced with something else like a TDA2040 or TDA2050 using the same circuit supplied with the kit?
Thanks in advance for every suggestion.
Ralf

[Bone]

The short answer is no. Although the 2040 & 2050 are in similar packages to the 2003 the pinout is different and the circuit around them is not the same.
Sorry

Tony.

[giralfino]

Thanks.
In the case of building only the amp, would the following circuit be OK? (look at figure 3 on page 6): TDA2050 datasheet
Or there is a better circuit?
TIA, Ralf

[sregor]

Yes, that circuit would work - but it won't give you more power, and requires more components and different values than the original board. There is a topic in here about 12 volt amplifiers, but anything more powerful would require another PCB and maybe a more robust power supply. Simplest solutions are bridge amplifier, like TDA7240.
There are many designs and ideas to be found by searching around. Have fun.

[giralfino]

sregor,
if I will build the amp around the TDA7240, would this be good for powering it?
40W 12V DC 3.2A Regulated Switching Power Supply
Thanks, Ralf

[pacificblue]

Originally Posted by Bone

Although the 2040 & 2050 are in similar packages to the 2003 the pinout is different

Since when?

Originally Posted by Bone

and the circuit around them is not the same.

But might as well be.

[sregor]

Originally Posted by giralfino

sregor,
if I will build the amp around the TDA7240, would this be good for powering it?
40W 12V DC 3.2A Regulated Switching Power Supply
Thanks, Ralf

I see no reason why not, however, I haven't used this supply before. YMMV.
One more comment/ observation. The TDA2003 can work on higher voltage supplies. It would require a larger resistor to drop the voltage on the tuner chip, and making sure the caps in the circuit are of high enough value.

pacificblue: Although the pins are labeled simlarly, the 2003 has built in biasing for single supply use, which must be externally added to other amp modules. (Also, the - input is a low impedance input, which makes the 2003 difficult to use in circuits designed for other amps.)