Cross fading two audio signals.. what taper dual gang pot?

[alec_t]

I stand corrected . That Fig 7 or Fig 9 arrangement in the link is a simple solution.

 

[Nigel Goodwin]

I stand corrected . That Fig 7 or Fig 9 arrangement in the link is a simple solution.

Which is why it's used in almost all mixers

 

[eyAyXGhF]

Which is why it's used in almost all mixers

I breadboarded both of the solutions today. Both seemed to work, but the very simple version I posted actually had quite a bit of very high frequency noise at the output of the opamp buffer after the mixing pot. Aside from that, it worked fine and sounded fine The proper solution (figure 7, Nigel) also worked fine and without any of the high frequency noise on the output. The way both of them mixed sounded quite different though, but neither sounded better to be honest.

 

[crutschow]

I breadboarded both of the solutions today. Both seemed to work, but the very simple version I posted actually had quite a bit of very high frequency noise at the output of the opamp buffer after the mixing pot. Aside from that, it worked fine and sounded fine The proper solution (figure 7, Nigel) also worked fine and without any of the high frequency noise on the output. The way both of them mixed sounded quite different though, but neither sounded better to be honest.

What type of high frequency noise? Is it a hiss (white noise) or a more specific frequency?

 

[eyAyXGhF]

What type of high frequency noise? Is it a hiss (white noise) or a more specific frequency?

My output wave was about .5Vpp and the noise showed up on my scope as the trace being about 50mV thick. At the highest frequency setting on my scope (it's a 5mhz scope) I couldn't see any actual wave making up that thick line.. so I honestly couldn't tell you if it was noise or a specific frequency wave.

 

[crutschow]

So does the noise from a speaker sound like a hiss?

 

[eyAyXGhF]

Nope, the audio output actually sounded fine to me.

 

[Nigel Goodwin]

Nope, the audio output actually sounded fine to me.

Sounds like it was oscillating ultrasonically, or even at RF?.

It 'could' be because it was on a breadboard?.

 

[eyAyXGhF]

Sounds like it was oscillating ultrasonically, or even at RF?.

It 'could' be because it was on a breadboard?.

That's sort of what I was thinking. Either way, I decided to go to Nigel's suggestion on my final design.. it didn't have the oscillating issue and isn't "all wrong"