I'm prototyping a board for the TDA2050, but it has a buzz at the output and if I touch the potentiometer at a certain position I can hear a local radio playing at the speaker.
For now I'm using 100n ceramic paralleled with the 220u caps. When done, I will use polyester ones. The resistor and the cap paralelled with the 22k resistor(feedback) are not present and I don't have the 220p cap in the input to ground.
I'm using the components values suggested in the datasheet and the PCB it's based on the layout presented in the datasheet, too.
There is something wrong with my layout?
For now I'm using 100n ceramic paralleled with the 220u caps. When done, I will use polyester ones. The resistor and the cap paralelled with the 22k resistor(feedback) are not present and I don't have the 220p cap in the input to ground.
I'm using the components values suggested in the datasheet and the PCB it's based on the layout presented in the datasheet, too.
There is something wrong with my layout?
Attachments
sivan_and
it's not about the buzz when touching the input, but it is always present.
I put a 150p cap before the 1k res going to ground, and the oscilations apears to went away. For now I a have a few problems that I believe it's relationed with the power supply, because some falls caused by a shot-circuit, my fault.
I still want to know what you thing about my layout.
it's not about the buzz when touching the input, but it is always present.
I put a 150p cap before the 1k res going to ground, and the oscilations apears to went away. For now I a have a few problems that I believe it's relationed with the power supply, because some falls caused by a shot-circuit, my fault.
I still want to know what you thing about my layout.
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.