2-channel in, 1 mono out. Mixer pedal?

[ericohman]

I'm thinking of buying VanAmps Reverbamate.
It outputs the reverb separately so I need a 2 channel amp for it to work. They also have a single channel model but I like the idea of the Reverbamate.

So I was thinking, has anyone built a 2 channel mixer pedal? Something like 1-knob for mix between Input 1 (dry) and Input 2 (reverb) then a mono output which I can  hook up to single channel amps.

Would it be a complicated build, tips and schematics are warmly welcomed.
I do have a 2 channel Pioneer 707 scratch mixer but it's too clumsy to use in the guitar rig

Thanks in advance,
Eric

[Taylor]

If you're going to mix them together before any tone controls or gain, then the Reverbamate offers no advantage over the Sole-Mate. The only useful thing about the separate outs is so you can have your clean signal distorted and your reverb undistorted, or cut the bass from the reverb and increase bass to the clean, etc.

If you decide I'm wrong, there is a nice variety of mixer schematics here:

http://experimentalistsanonymous.com/diy/index.php?dir=Schematics/Buffers%20Switchers%20Mixers%20and%20Routers

[MikeH]

You could do this really easily.  And if you're going 2 in 1 out, you don't lose much signal (like when going 1 in 2 out), so you could probably get away with going passive.  Or, you could build something like the ROG splitter blend, and just use the 'returns' for a 2 way mixer/blender.

[ericohman]

Thanks.

Thanks. Will check it out.

The passive mixer had 3 inputs
http://experimentalistsanonymous.com/diy/Schematics/Buffers%20Switchers%20Mixers%20and%20Routers/Passive%20Mixer.gif

Can I just remove one jack, pot and resistor and have a 2-channel circuit. Or do I have to change the resistor values? Didn't really understand what the resistors are meant to do in that circuit.

Talking about reverb.
Taylor mentioned the advantage with having reverbamate is for having undistorted reverb, I got to me wonder...
Say an old fender reverb amp, where they built to have undistorted reverb. Never even thought about that, but maybe reverb sounds bad if it's fuzz and stuff on it.

My idea with the mixer was that if I have a small simple 2-channel mixer I would sort of have both the reverbamate and sole-mate. While if I buy the sole-mate I couldn't experiment with the reverb as much...

A passive mixer does that mean that the output will be kind of like taking the two inputs in parallell. So input 1 and input 2 with a signal of 100 each would result in a combined output of 50?

Summary:
1. To make a 2-channel passive mixer, should I change the values of the resistors and pots?
2. Are built-in to the amp reverbs in general undistorted/ungained?

[d95err]

1. To make a 2-channel passive mixer, should I change the values of the resistors and pots?
2. Are built-in to the amp reverbs in general undistorted/ungained?

You can remove one of the inputs without changing the values of the resistors and make a 2-channel mixer. In your case, you really wouldn't need the volyme control (you just want both inputs to loose as little signal as possible). Therefore I think you could actually remove the volume pots as well. The result would be just two resistors and three jacks. Simple! You might have to experiment on the values of the resistors. Something like 47k - 220k should work.

The problem reverb and distortion is if the reverb signal is distorted, i.e. if distortion is generated after the reverb is mixed in. There is no problem using distortion before the reverb. On old Fender amps, almost all distortion is generated in the poweramp, so the reverb signal is actually distorted, and that seems to work quite well anyway...

This is the main reason Marshall never used reverb in the old days - their amps were meant to be played LOUD with heavy poweramp distortion, so reverb would not work very well. Fender amps were meant to be played relatively clean so there was no problem with the reverb being distorted.

[arnqvist]

what does the resistors really do? what happens if I use a very high resistor and what happens if I don't use resistors at all... just connecting the tips to the output tip?

[ericohman]

Maybe this would be a good idea. Having just one pot that is like a fader for [ch1] --- [ch2]
I haven't really understood why the resistors are there at all though. Does it have to do with the signal coming in? In my case the signal coming in will be a reverb (only wet) signal and for example a heavily boosted colorsound overdriver signal to the input 1. What difference will it make if I use, say a 1k pot vs a 500k pot... And, should I use resistors as well in this kind of circuit. Resistors between the inputs and the pot for both ch1 and ch2?

2-channel mixer/blender. What's wrong?

[ericohman]

Could an Y-cable work for connecting guitar + reverb (wet only-signal) into a single channel amp?

Guitar --- Reverb Dry ----------|
                                            ---------- Amplifier input
              Reverb Wet ----------|

Or will it mess everything up when connecting to a single channel? I know the Y-cable is often used the opposite way, guitar to 2 inputs of an amp.

[ericohman]

The result would be just two resistors and three jacks. Simple! You might have to experiment on the values of the resistors. Something like 47k - 220k should work.

What does the resistor value really do for difference?

For example, if I buy a tele 6,3mm Y-cable. It doesn't have any resistor, or does it?
Don't quite get what the difference resistor values do...