Would anyone with experience paralleling output transistors just check this out for me please,
here's a link to the pic of the driver board circuit and i'm interested in knowing if the 6 pin connector to the right of the board that connect's to the circuit with the main output transistors and is shown on the link below it would be safe to connect to another channel's output transistor's using the same 6 pin connector and joining both speaker output's together and running them in parallel for the higher current capability for driving a 4 ohm's and below load please ??
As you will see the Driver board's and output stage that form this amplifier are salvaged from the Onkyo TX-875 along with it's high current power supply however everything else has been removed so there's no protection circuit to trigger or any other part's of the original receiver over complicating it's use and i've already got it working under testing conditions, I'm left with a bunch of 12v relay's to control power and speaker output's
Driver board...
Dropbox - Onkyo TX-875 Amp Driver Board.pngThe output transistor circuit layout...
Dropbox - Onkyo TX-875 Power Amp transistors 2SC5242 & 2SA1962 layout board.pngYes there's questions if the drivers have enough current to drive 4 pair's of 2sa1962 / 2sc5242 unless someones got any ideas of modifying the second driver board to keep both in perfect sync in order to drive the output transistors in parallel,
My idea was to cut the traces on the second driver board at the bases of Q6036 & Q6046 and (inject/modify) drive the transistors with exactly the same signal taken from the base of the same driver transistors on the driver board i'm actually using to provide the extra current to drive the extra 2 pair's of 2sa1962 / 2sc5242 and joining the speaker output's together to run them in parallel checking that there's still the same +0.6v and -0.6v respectively going to drive the 4 pair's of 2sa1962 / 2sc5242 ?
I've repaired PA amplifier's that use similar output topology using output transistor's in parallel for better current handling at low loads and reused salvaged modular amplifier's before and modified them to my need's in past project's however need a little guidance as i really do want to get this right and use it as a power amp connected to a AVR using the preamp outputs with my main AV system to drive a (now passive after smps failure) monitor audio subwoofer that's 500W RMS at 4Ohm's
Also use 4 standard channel's to drive my main stereo pair in a Bi-amped configuration
can someone please give their thoughts an advice please ?
cheer's