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Chip Amps Amplifiers based on integrated circuits

Aux issue
Aux issue
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Old 5th May 2020, 04:16 PM   #1
Charan Raju H is offline Charan Raju H
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Default Aux issue

I have a TDA7492 25w+25w Bluetooth amplifier board by sanwu. I've been using this board from past 1 month and I had no issues. But today when I plugged in a 3.5mm audio jack, it didn't recognize. This board always switches from Bluetooth to line in whenever we plug in an audio jack. But now it's not happening
Can anyone help in solving this issue...
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Old 6th May 2020, 01:14 PM   #2
Kay Pirinha is offline Kay Pirinha  Germany
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I'm sure you're going to show a circuit diagram that allows us to try to help you .
Best regards!
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Old 6th May 2020, 01:29 PM   #3
jan.didden is offline jan.didden  Europe
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Quote:
Originally Posted by Charan Raju H View Post
I have a TDA7492 25w+25w Bluetooth amplifier board by sanwu. I've been using this board from past 1 month and I had no issues. But today when I plugged in a 3.5mm audio jack, it didn't recognize. This board always switches from Bluetooth to line in whenever we plug in an audio jack. But now it's not happening
Can anyone help in solving this issue...
Was it a different jack from the first times when it worked? Different source? What was different? That is always the first logical question.

Jan
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Old 7th May 2020, 11:34 AM   #4
Charan Raju H is offline Charan Raju H
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The board has got a 3.5mm female socket. I was using a proper 3.5mm audio jack. But last week when I plugged in my 3.5mm jack into the socket, it didn't respond. It continued to work over Bluetooth.
I'm using a 12v, 2A DC adapter for powering up my board.
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Old 8th May 2020, 10:35 PM   #5
sgrossklass is offline sgrossklass  Germany
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The way this usually works is that the jack has an extra set of switch contacts that can be used to signal whether there is something plugged in. Find the pins going to these and check continuity with a multimeter, both plugged and unplugged. The solder joints on these 3.5 mm jacks are notoriously susceptible to breaking under mechanical stress, more so when they aren't very good to begin with (brittle lead-free solder doesn't necessarily help either), so inspect those closely.

If this doesn't lead anywhere, you may have to measure voltage there and possibly follow the traces. Having a shorted ceramic capacitor on there wouldn't help.
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