Thank you all.
floobydust wrote:
I'd suggest something that's active... you can use either FETs or older bipolar transistors
I looked into that, and tried it out on the simulator and seems to work as expected. Definitely a good suggestion, thank you.
GARTHWILSON wrote:
This circuit will give nearly the same output signal voltage as your passive mixer above, but can drive much heavier loads at that voltage.
That was the deciding factor for me. I see that a 100K bleedoff resistor doesn't let C3 stabilize very quickly, so I changed it to 10K and it seems to work ok in the simulator. Then again, I don't think I can trust the simulator because when I add C2, the thing starts freaking out at random times. Lastly, for sake of whoever will read this in the future, I changed the 4.7uF cap to 10uF and it seems to give me a more squared wave, not a psuedo-triangle-thing.
Thank you very much for this Garth, I appreciate it greatly.
BillO wrote:
This is normal Chad. Even with op-amps buffering each input, the mix is the sum of the input signals. Rather than think of each signal being at "half" volume, think of it as that is their full volume. You will get much more amplitude when both inputs are high or low together. You'll get the sum.
Ok, that is good to know. I'm so new to analog, and even more new to audio mixing, that I don't even know what the goal is sometimes. I just think, "Can't I just stick them together?" And yes, kindof, but the result is as expected: Waves that interfere will cancel, waves that combine will add. Simple, but I guess I didn't understand that simple was intended.
Thank you all very much, I'm going to be using Garth's circuit. More updates on the 6502 project soon to come!
Chad