TDA 2006 amplifier

[mehtadhaval]

Hello friends
I was trying to make an amplifier using TDA 2006 IC.
here is the circuit:

please help with 2x12w 12 V portable audio amp

my problem is that when I connect circuit as shown, it doesn't work
but when I remove the 22uF capacitor (The one on the 2nd lead of the IC) & connect 4.7K resistor to ground, sound comes from the speaker with a lot of distortion (not hum).

on the output I used 470uF/25v capacitor. does that affect the o/p?

[boholm]

Beware !

The picture shows two different ways of connecting a TDA2006. That is; two different circuits in the same picture.

Which of the circuits have you used?

[mehtadhaval]

I have used the first one which is using a single power supply.

[boholm]

Removing the 22 µF and connecting the 4,7 K to ground is a very bad idea since you move the DC point on the minus input, while the plus input remains the same = 1/2 Vcc. This results in the output of the TDA2006 will go to Vcc.

Please put the circuit back to normal and measure DC on inputs, output and Vcc and Vdd on the pins of the TDA2005 - first with signal input not connected to anything and then again with the signal input shorted to ground. Since you have a potmeter in your circuit, I must ask you to do further DC measurements with the pot first turned all the way up and then turned all the way down.

Plus: Does anything happen soundwise and measurementwise, if you turn the potmeter up and down continously?

[mjf]

on the output I used 470uF/25v capacitor. does that affect the o/p? [/B][/QUOTE]

hello.
it is a high pass filter ( in connection with the speaker load),it cuts off the bass a little bit.you should use 2200uf or bigger for good bass reproduction...........
and this output elco is drawn in reverted in the schematic,the + pole has to be connected with the output pin of the opamp.

greetings............