Hi, I finded a circuit and it is working I am using 20w car speaker like volume level 10 no problem but later so much noise this circuit creator using for this 100nF Oscilloscope is giving 2.2MHZ frequency.

I did same think but not worked for me.How can I remove this 2.2MHZ Output Noise frequency?
Sory my bad english.

Circuit by afrotechmods.

 

The network on the output is not the Zobel network that National Semiconductor recommends for compensating for the speaker's inductance.


You might want to try this network (0.05 uf -anyting from 0.047 to 0.1 uf, and the 10 ohm resistor and see whether that cures the noise and oscillation problem.