Yes, transistors are BC338 (driving the relay) and 546 (other). 33k is fine. You can simply install the plugin on your system, also if you have not connected any hardware yet. The actions of the plugin should have no effect then. On the plugin page, there is also an enlarged version of the schematic.
Pin numbering is the pin number on the 40 pin GPIO connector.
Button pin is set as input with internal pull-up resistor, ready pin as output.
Unfortunately I have no kit or pre-built device. You have to build/solder it yourself. The parts are standard components, it should not be a problem to get them.
But this power button plugin could be what you need: I have designed it to work with 5V so that it acts as a switch between the power supply and the PI.
What should (I did not try it and I therefore do not guarantee it :-)) work for you is:
Replace the 5V relay by a 12V relay, use a 25V capacitor for C1. Now the entire cicuit should work with 12V.
In your case the setup then would be: 12V power supply => Power button => Justboom DAC => PI.
The only thing to keep in mind is that the PI only supports 3.3V at its GPIO PINs. D2 and T3 are there to keep away higher voltage from the PI. So the 12V should not show up there (like the 5V do not show up).
I hope this helps…
In the „Always on“ position the switch keeps the capacitor charged all the time, meaning the Raspberry Pi will always be switched on. Pressing the On/Off button will have no effect. In „Auto“ position, the switch has no effect, and the On/Off button allows to start and shutdown the Pi. The „Always On“ position is helpful if the powerbutton plugin is not running, e.g. while you reinstall the OS on your Pi. In normal operation, set the switch to „Auto“.
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