Re: Speaker Jack
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You could use the second audio amp in U1. The TDA2822 is a dual amplifier. What you’d need to do is this:
Connect U1-6 to VOL-H. This will give you an auxiliary sound output that is independent of the volume control.
Connect the + terminal of a 470 µF, 16V electrolytic capacitor to U1-3.
Connect the - terminal of the above cap to your auxiliary out mini jack.
The 470 µF could very likely be much smaller, depending on the input impedance of your Signal Link.
Experiment, it won’t hurt.
You may also want to add a resistor divider between the cap and jack to reduce the signal strength, depending on how much your Signal Link can tolerate.
Considering the problem others are having with the TDA2822 you probably should add a resistor in series with the cap, unless you implement the resistor voltage divider, that will provide the same protection.