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Old 11th February 2013, 06:40 PM   #11
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Join Date: Feb 2013
Originally Posted by cbdb View Post
you dont need the extra buffers, the summing amps are all you need, you just have to rewire the inputs to the summing amps, omitting channel 3 from the head phone amp. Are you sure the section wth the discrete transistors is not the HP amp?
You're right. My schematic is wrong. The part with transistors is the HP amp (verified on PCB).

However I'm not sure I understand your first statement. You mean if I remove the connection from CH 3 to HP amp it will work? I thought the signal would reach it through the center bus (where Channel 1, 2, 3 connects with Master Out and HP Out on the same wire.) See original schematic.
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Old 18th February 2013, 01:24 PM   #12
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Join Date: Feb 2013

Here's the mod schematic with the right labels
Click the image to open in full size.

So far, the buffer itself is working. I can mix both Ch. 1 and 2. I'm using a BA4560 and a 10k feedback resistor (best results).

What doesn't work:

- Simply wiring Ch. 3 to the buffer output doesn't work. I no longer read the buffer input signals (Ch 1 & 2).

- A 100k resistor (best results) from buffer output to ground is needed to get a clean signal into Master input.

- With everything wired, the Master output is clipping really bad.

Can anyone clarifying what cbdb is saying? How can I use the summing amps only?
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