Switching between tuner and effects/amp

[Willy]

I need a switch so I can tune my guitar and or play, with an indicator.

I thought in a circuit like this. Am I missing something? (like buffering, etc.)



Thanks in advance!

Willy

[Rodgre]

Seems right to me, unless you just want to add something like a 1M resistor from the audio part of the switch to ground, to reduce pops.

Roger

[Willy]

This resistor should go from the effect input to ground. Right? How does this affect to the signal or the sound?

[Peter Snowberg]

The resistor will load down the signal a tiny bit, but I doubt enough to make a real difference. If you didn't like the tiny signal reduction, you can always move the value up to 2.2M or 3.3M. You just need a little bit of a DC path to ground.

One suggestion, you might want to move the LED to the tuner side so that the battery lasts longer.

Looks good! It's a nice, simple solution.

Einstein said something like "make things as simple as possible, but not simpler."

-Peter

[DaveTV]

What you're looking to build is basically a simple A/B box, which shouldn't require any additional resistors at the input/output, assuming everything is grounded properly. A good A/B box is a handy thing to have, and you'll probably find 101 other uses for it besides just your tuner.

There are a few A/B box designs on the web. I built the one that's shown on Fulltone's web site (my first pedal in fact) and it works great. It uses a 3PDT switch so you can have LED's with true bypass (get the switch from Small Bear--cheaper). Just be sure to wire the switch as shown, with the lugs connected with jumper wires making an X. This will ensure proper grounding and should eliminate pops.

[aron]

I can't see your picture, but what I did was build a buffer circuit and also have it route the signal to the tuner and ground out the signal to the amp when in tuner mode.