Z80 Refugee wrote: ↑Fri Jun 15, 2018 10:11 pmI can't tell you which contact is which on that photo of the socket - you will need to work that out for yourself (it's not rocket science).
I would have thought the rest was pretty straightforward (now you have established the negatives are common) too: common the negatives and take them to the negatives of the speaker and the common return contact on the headphone socket, then for each of the positives take them to the pin on the socket which links to each side of the headphones when plugged in. Finally, there will be contacts on the socket which have the audio feed when the headphones are out but not when they are plugged in.
Apart from not knowing which contact us which, I don't like explaining every last detail because nobody learns by being told the answer. The diagrams already given should be enough of a clue (even if not exactly right for this situation).
Note there will be nothing to moderate the headphone volume.
If you had read the whole thread you would know we've already been there, and...
My circuit with the single capacitor to ground will work for a bridge amplifier. It does not connect any of the 4 amp outputs to any of the other 3.
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