Adding buffer on wah input

[Vlad123]

Hi there guys, as the topic says I want to add input buffer to my custom built wah pedal (I draw pcbs in eagle so space is not a problem). The buffer is going to be op amp based. I was wondering how to build it. I know how a standard buffer schematic looks like with 0,1uf input cap and 10uf output cap. What values should I use for wah? Couldn't find any schematics for that. Thought of using 0,01uf at input and 68k+0,01uf at the output just like guys from dunlop did in cry baby, but again that buffer is transistor based. The reason want to use buffer is because wah is first in the chain, and I dont have room on pedalboard for separate buffer.

[thermionix]

Member "Error!" seems happy with his opamp input buffer, you can ask him what circuit he used:

https://www.diystompboxes.com/smfforum/index.php?topic=121304.0

If you're looking to avoid "tone suck" in bypass, it might be easier to just switch to true bypass, only requires a DPDT footswitch.  Ground the input to avoid switch pops.

[Vlad123]

Thanks thermionix. Already have, all pedals that I build are true bypass. Thats Klon buffer, if I am not mistaken

[antonis]

I think you're overthinking.. 

A simple non-inverting buffer with an input HPF of, 16Hz say, (from 100nF/100k to 10nF/1M) and an output cap/wah input impedance HPF of about the same or higher cut-off frequency, should work just fine..