Tuner output

[johellin]

Hi.
I am currently building a looper/switcher with an Arduino Mega as controller.
I want to add a Tuner out, and am wondering if that is as easy as the image below suggests; Just hardwire the tuner-jack to the input jack (so you could in theory use either as input or tuner)
https://www.dropbox.com/s/8c96lo4o87a8b6v/buffer_tuner.PNG?dl=0

I could of course put a dpdt inbetween to get a tuner mute. But thought I'd avoid that, and use my volume pedal as mute.

Any comments/ideas/advice appreciated.

[GibsonGM]

Not sure from the drawing what you're asking...anything 'sucking' at the input (proper term = loading) can degrade the signal going forward.

Perhaps this would get the idea across a little better, Johellin?  Welcome to the forum, by the way    I like the JFET version here, don't know if you are stuck with opamps, but that's just my preference...this way, there is no loading, driving your tuner does nothing to the signal - you can drive tons of other things this way, too!

http://www.muzique.com/lab/splitter.htm

[johellin]

Thank you for your suggestion. I will try to make one of those for my circuit.

[johellin]

Anyone able to explain how changing the 1uF capacitor to 10uF would affect the circuit?

JIME

[GibsonGM]

The output cap, 1u, and the 100k output resistor form a high pass filter...anything higher than 1.6Hz can pass...changing the cap to 10u would change the cutoff frequency to like .16Hz, letting more bass thru...but you won't hear it, because at 1.6Hz, you're already pretty "all pass", LOL.

Go ahead and use it   

[johellin]

Awesome!
Thank you very much for the explanation. Learning something new all the time!

[GibsonGM]

No problem!   FYI, the way to calculate the cutoff frequency for a simple R>C filter like this is:  "   F cutoff = 1/ 2pi * R * C "

There's a lot on the net about R C lowpass/highpass filters, look some up as you go along, you'll need it for tone controls!