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How to deal with the problems of IC burning up?

 
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Bolling



Joined: 16 Jun 2017
Posts: 1

PostPosted: Fri Jun 16, 2017 4:45 am    Post subject: How to deal with the problems of IC burning up? Reply with quote

I looked at a friend's guitar amplifier which wasn't working, the problem was clearly (because it fell off) a broken IC (TDA2030AC).

After replacing it, the amplifier started working again but when I was taking some measurements I made a short-circuit and burned it.

When I replaced the TDA2030AC again, the sound was very soft and distorted. I checked the datasheet and the circuit is a bit different than the recommended implementation. Some resistor and capacitor values are different, but it's a dual-supply non-inverting configuration.

The strange thing is that while making contact between pins 2 and 3 with my fingers it sounds fine. And the same occurs with a resistor between about 100 to 500 kohms (see red line in my diagram). Even if that solution works, I would like to understand what's going on and if there is likely another part of the circuit damaged.

I've post the circuit (excluding the rectifier and pre-amplifier) in the attachment.

And this is the reference circuit in TDA2030's datasheet: http://www.kynix.com/uploadfiles/pdf9675/TDA2030AH.pdf (Figure 13: typical amplifier with split power supply)

I would appreciate any clarifications, thanks.
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The Robman
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Joined: 01 Aug 2003
Posts: 18516
Location: Chicago, IL

PostPosted: Fri Jun 16, 2017 7:47 am    Post subject: Reply with quote

You got your answer for this over a year ago:
https://electronics.stackexchange.com/questions/228943/distortion-in-tda2030-circuit

Then you got more answers here:
https://www.questarter.com/q/distortion-in-tda2030-circuit-26_228943.html

And even more here:
https://forum.guitar.com/amplifiers-23/why-does-circuit-burn-after-i-replaced-tda2030-ic-226880

So, what else do you need to know?
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www.hifi-remote.com
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