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I think I've seen this before but forget. Say I have circuit A, and want to blend in circuit B?

Goal is to run A, into B, in series.

I use a stereo pot wired like this:

Wouldn't that mix the first signal out as it adds the second in? I want the first circuit to remain full signal and blend the second in series. That way, the main function/circuit is always there, and the blend would be no 2nd circuit fully ccw & viseversa.

If the input impedances are high, and outputs fairly similar, you can just put the circuits in parallel. If they have output volume controls, just buffer the circuits after the volumes.

If you need to separate the inputs, just buffer the inputs with FET buffers.

that dual pot is good but I dont know if you want log. one of the resistive elements would need to be reverse log in that dual pot. you can a single 50k or 100k linear as a blend with the middle lug as the output. if you want it to only travel %0 to %50 you can just add a 100k to lug 1 or lug 3. the outside lug without the 100k resistor will always be louder or equal attenuation.

runoff groove has a schematic for the splitter blend that you can use as a starting point. you might not need the buffered splitter on the input. you might not need the buffers before the blend control. take what you need and leave the rest. it is TL072 based.

Boss BX-600 mixer. Its not real big, has six channels and its all 1/4'" unbalanced. I have one.

I think using a switch for the second portion will work better. Not what I orig wanted but it's not a big deal. I could use a pot/switch maybe.

McSpunckle wrote:If the input impedances are high, and outputs fairly similar, you can just put the circuits in parallel. If they have output volume controls, just buffer the circuits after the volumes. If you need to separate the inputs, just buffer the inputs with FET buffers.

If they are in parallel, wouldn't the two be side by side/layered? A key sound is A running into B.

eatyourguitar wrote:that dual pot is good but I dont know if you want log. one of the resistive elements would need to be reverse log in that dual pot. you can a single 50k or 100k linear as a blend with the middle lug as the output. if you want it to only travel %0 to %50 you can just add a 100k to lug 1 or lug 3. the outside lug without the 100k resistor will always be louder or equal attenuation.
runoff groove has a schematic for the splitter blend that you can use as a starting point. you might not need the buffered splitter on the input. you might not need the buffers before the blend control. take what you need and leave the rest. it is TL072 based.

I'll look into it, thanks!

FullCustom wrote:Boss BX-600 mixer. Its not real big, has six channels and its all 1/4'" unbalanced. I have one.

I'm building this for a specific pedal, not to mix random shiz lying around.

Oh ohhhh! You want the second one in series with the first one.

After the main circuit, you can use a typical blend circuit (like a B.Blender) to blend between just a buffer and the second circuit. Or you could do it with the dual pot idea (use the kind meant for guitar blend controls).

So, the circuit would look kinda like this:

Main Circuit > Splitter (parallel buffers) > Pot A > Buffer > Output
...............................................> Second circuit > Pot B > Buffer > Output

... I hope that kinda made sense.

McSpunckle wrote:Oh ohhhh! You want the second one in series with the first one.

After the main circuit, you can use a typical blend circuit (like a B.Blender) to blend between just a buffer and the second circuit. Or you could do it with the dual pot idea (use the kind meant for guitar blend controls).

So, the circuit would look kinda like this:

Main Circuit > Splitter (parallel buffers) > Pot A > Buffer > Output
...............................................> Second circuit > Pot B > Buffer > Output

... I hope that kinda made sense.

makes perfect sense. you could also use a TL082 or TL084 quad opamp in place of the two TL072. it depends on how you do the layout and what works for you. I dont know if there are any real problems with cross talk on high gain distortion circuits sandwiched between opamps on the same IC.

That's a great idea Jero. I fucked up the splitter blend circuit twice somehow and could never get it to work. I will be interested to see what you come up with....

see if you can get one half of TL072 working on the breadboard passing audio. there are 4 individual opamps on 2 IC's but I think you need to might need to have the parallel buffers on the same IC.