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F
FicoresS
Associate
July 11, 2024
Question

tda 7560 ic not working problem

  • July 11, 2024
  • 1 reply
  • 2759 views

I bought this chip and pcb circuit from the internet, then when I plugged all the components into the pc and powered it up, I couldn't get any sound. When I powered up the circuit, it got hot inside, but only a low sound came from one speaker pin, but it didn't reflect the sound I gave to the speaker in any way. Also, this heating situation happens when there is no st-by short circuit. When I checked it with the short circuit-diode stage of the multimeter, when I filled the capacitor a little and touched the legs of the channel with low sound to GND, it showed a short circuit and stopped after a while, so I think there is a short circuit between the power input and the channel with low sound, and when I touched its negative end to GND and the other end to the output of the channels, I see 600 in the outputs without low sound, while I see 70 and 100 in the channel with hiss. These are what I found for now, thank you very much if you can help. Also, I want to ask something, do we need to short-circuit the st-by and mute pins and leave them or do we need to keep them in the short circuit position when we use them?

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1 reply

Peter BENSCH
Peter BENSCH
Technical Moderator
July 12, 2024

Welcome @FicoresS, to the community!

  • Do you have any knowledge of electronics in general and audio amplifiers in particular?
  • What kind of board did you buy and where?
  • Have you looked at the schematics of the board?
  • Does the board have a heat sink?
  • What kind of power supply do you have for the board?
  • What kind of loads (speakers) with what parameters have you connected?
  • Are these speakers in an enclosure?
  • What audio source with what voltage is connected to the inputs of the amp?

These are just initial questions, as you have provided practically zero useful information.

Regards
/Peter

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F
FicoresSAuthor
Associate
July 13, 2024

I have some knowledge in general.

I took the PCB from the layout in the datasheet and arranged it myself and printed it.

Yes, I looked at the schematic

Yes, there is a heatsink

I used a 3s Li-ion battery pack

I connected a 4 ohm speaker just to test it

The speakers are bare

I connected 11.8V as power and it drops to 11.5 volts when the circuit is active.
I used both a computer and a phone as audio input

There is something I didn't mention extra, while making the connections in the circuit, I connected in1 and in2 directly in parallel and connected a capacitor to the end, then I gave an audio input from the other end of those capacitors.

AScha.3
AScha.3
Super User
July 13, 2024

Show a pic from your amp construction .

And a link, what you bought .

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