Tau Pipe Phaser output question.

[digi2t]

I'm planning on doing the "Deluxe" version, with the stereo output wiring. I've noticed in the drawing that 10uf bipolar caps are used on the outputs, to "get rid of the remaining millivolts of DC voltage" (taken from electro-music forum).

The Deluxe wiring scheme is on page 3 of this document; http://www.jhaible.de/tau/jh_tau_signal_and_cv_connections.pdf

My first question is this; I have some 5uF bipolar tantalums, and some 2uF bipolar electros on hand. Would these do? Or do I need to go with the 10uF's?

Second question; Why are these caps there in the Deluxe version, yet absent on the slimmer version? Is it to avoid popping when switching in/out?

[PRR]

2uFd is fine for loads 10K and up.

[frequencycentral]

Two 22uF polarised caps back to back (negative to negative) will give you a 11uF BP cap.

[digi2t]

Thanks guys. I was a bit tired last night, and was a bit rash on my second question. I had the "DUH, you dum-dum!" moment in the shower before going to bed last night.

Any DC across a pot would make noise.

Thanks again guys. Scholars, and gentlemen, as always. 

[Jordan A.]

I didn't install any caps on the output of mine, I read about +5 millivolts of static offset, and up to about +/- 20 millivolts of CV feedthrough when the LFO is going fast and the depth turned up.  The amount of feedback changes this a little, as does the frequency setting, pretty much everything changes the amount of offset a little.  This probably varies from build to build as well, I used CA3046's in mine.

Caps on the output won't help too much with CV feedthrough when the LFO is fast, and 5 millivolts isn't enough to bug me, YMMV.

In practice it's not very noticeable, at extreme settings I can hear it click and thump a little.

The biggest improvement I think would be achieved by boosting your guitar signal before going in, and then turning the output level down, this will ensure that your signal is much bigger than any thumps.  Since it's set up to accept +/- 5 volt signals you can give it as big of a signal as you are likely to have in guitar world without fear of clipping.

Have fun with it!

jordan