Paralooper with LP and HP filters

[karter2000]

Hi all,

I'm building a Paralooper based on a pcb by John Lyons as per Charlie's page below:

http://www.moosapotamus.net/THINGS/paraloop.htm

I would like to have a lowpass filter on the "clean", and a highpass on the effects loop (on the send).  Charlie had offered a pedal for sale for a brief time with those filters.  I tried emailing him about how to set the filters up, but he's not got back to me.

I'm a bit new to filters, so I'm wondering if anyone could point me in the right direction.  The info I did find from Charlie on the HC forum was that the LP was active, and the HP was passive.

Thanks,
Lyle

[sean k]

I would suppose that an HP on the send would be the likeliest palace to put it. Just tailor the output cap to the rolloff you desire.


C4 as setting the corner frequency for the HP over the 470k output resistor and then add a pot between R6 and C5 wired as a variable resistor to set the LP rolloff.

If you want the rolloffs sharper then use two filters in series, one after the other, and use a dual pot.

[karter2000]

Thanks!