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TDA7492P Aux Without Bluetooth problem
TDA7492P Aux Without Bluetooth problem
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Old 25th March 2017, 09:15 PM   #1
Zukohone is offline Zukohone
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Join Date: Mar 2017
Unhappy TDA7492P Aux Without Bluetooth problem

Hello!,
I've bought on AliExpress my TDA7492p amp with board and everthing (link here). There is a Aux Input but this wont work without a bluetooth source.

For example if i plug Aux without bluetooth devices connected i hear nothing. But if i pair a bluetooh device and play something then i plug aux playing other thing i can hear both. Even ehen i turn on the amp with AuxIn when the amp is looking for a BT device make a noise and when noise is played i can hear the Aux.

BT Device Paired, not playing = no Audio from AuxIn;
BT Device Paired , playing anything = Normal Audio on AuxIn;
no BT Device Paired = no AuxIn audio;

what can i do or what i'm doing wrong, my priority is Aux, i want use amp on pc over aux BT isn't my necessity.

i'm not sure if what i write is clear and i can record a video if you want.
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Old 2nd April 2017, 07:55 PM   #2
hari655 is offline hari655
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Join Date: Dec 2012
I too have the same problem were u able to fix the problem??
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Old 3rd April 2017, 05:01 PM   #3
Zukohone is offline Zukohone
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Join Date: Mar 2017
Nothing, i was wondering if is just problem of my chip ,is good to know it`s not.
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Old 3rd April 2017, 06:28 PM   #4
Zukohone is offline Zukohone
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Join Date: Mar 2017
something that i notice, when a BT device is connected if you press Vol +/- button you should hear a beep, but on my amp this only happen if BT is playing something if you wont playing nothing even with the BT device connected you cant hear nothing.

@hari655what is your font voltage? i`m using a 9V (the minimium required by specification) i'm thinking maybe is because of that
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Old 3rd April 2017, 07:30 PM   #5
Zukohone is offline Zukohone
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Join Date: Mar 2017
Now i understend, the Aux that come with the board is't a Aux-Out port, is a Aux-In port. You can test it by connectiong a BT Device, then connect a phone or something like that and play.
So i see there is a modification that we cando to ad a Aux-In i'm gonna try.
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Old 12th April 2017, 09:35 PM   #6
TinCanMan is offline TinCanMan
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Join Date: Apr 2017
If your board is like the one I received from an Ebay seller today, then I think I have figured out what the problem is - it's not an aux in port. At least not a stereo aux input like I, and probably everyone else who has bought one, thought it would be. I'm certain it is a mono microphone input so that the amp can act as a Bluetooth hands-free phone adaptor, hence why it will only work when there is a Bluetooth connection. Frankly I have been misled and I'm not happy. The amp itself seems OK and even sounds quite good given the limited choice of speaker drivers I have to hand to test it with. But without an aux in it's not what I needed. Also the BT won't synch with my old Samsung tablet and the case that came with it is pretty useless because the buttons supplied don't fit, they are designed to fit a board with taller micro-switches. Typical cheap Chinese BS, I think I will pursue a refund.
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Old 15th June 2017, 03:47 AM   #7
bandicoot is offline bandicoot
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Join Date: Jun 2017
The 3.5mm socket works as a line-out or karaoke input, but I'm not sure this is intentional.

The problem is that the bluetooth module mutes the amplifier when no bluetooth-audio is playing. Could be to save battery life, or stop noise.

It should be possible in theory to modify it so AUX-in works.

See Aux input for TPA3116 bluetooth amp
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Old 9th May 2018, 09:44 PM   #8
BrixS is offline BrixS
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Join Date: May 2018
Talking Fixed it

Hi! I know that I am almost a year too late, but i have found a fix! (Just in case someone else runs into this issue).

Just connect pin 8 and 10 on the Bluetooth module, like shown in the pictures.
Then the amplifier will not turn off, even though no device is connected via Bluetooth. The reason being, that pin 8 is responsible for turning on the amplifier with 1.5V, when a device is connected, and pin 10 being 1.5V.

It took some trial and error, but when you know the solution it is an easy fix.

Hope it helps.

IMG_0163.jpg
CSR 8635 Modul.jpg
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Old 27th May 2018, 06:12 AM   #9
Serpent is offline Serpent
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Join Date: May 2018
Thanks BrixS, I've now managed to get Aux input working on my Bluetooth Amp module, it had me stuck for quite a while.
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Old 24th June 2018, 09:59 PM   #10
knuckles1936 is offline knuckles1936
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Join Date: Jun 2018
Thanks from me too, BrixS. That's exactly what I needed.
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