TDA2030 IDENTIFYING AUDIO INPUT

[TieBravo]

I found this unused amplifier board made of 3 TDA2030, but i can not understand the audio input. From the left you can see usb output, speaker output, Volume control. So where is the stereo input?

I am suspecting that this might be a mono board with subwoofer (top right), treble and midrange outputs.

How can i connect stereo aux and volume control at the same time.

 

[kellys_eye]

Usual practice is to apply each channel via resistors/capacitors and 'sum' the left-right signal to create a mono source.

 

[davenn]

. So where is the stereo input?

one trick is to look at the pin outs for the TDA2030 on its datasheet and work back from there
It shows pin 1 as the input via various resistors and capacitors depending on it's use
on your component side photos, pin 1 is the left hand pin

 

[kellys_eye]

The OP's own schematic shows the input. The terminals identified for the volume control are listed - left-to-right - as;

Ground
Middle pin
Audio in.

The audio 'in' is the mono (or pseudo-stereo via combining resistors) input signal.