Interested in Tau Pipe Phaser / Flanger boards ?

Funky40 · Posted: Sat Oct 25, 2008 7:53 am Post subject:

ok, i understand now:
Both Taus are wired correct. The CV input has a normalization,
but: i added a muteswitch to the CV input.
when the muteswitch is set to on, but nothing is pateched to the CV input,
then the Modulation depth can be set to zero, indeed .

Is the mute switch set to mute and the normalisation broken, then not........that was the Problem !

Only the attenuation behave of the extern CV is not 100% to my taste as it is a crossfade between internal LFO and the external source.
I asssume that this behave is correct ?
Unfortunately i have not made the external CV input with an attenuator.
I would recommend this, and i will change it on one Module that anyway must be repaneled.

Thank you Jürgen !
Your help is very appreciated.

jhaible · Posted: Sat Oct 25, 2008 8:09 am Post subject:

Funky40 · Posted: Sat Oct 25, 2008 12:47 pm Post subject:

ahhh, ok, i understand.
then i will add a attenuator to the 1v/oct input if repaneling.
thanks

ericcoleridge · Joined: Jan 16, 2007 Posts: 889 Location: NYC

I've had my Tau Pipe up and running for several months now, and it's indeed my very favorite phaser ever. I'm really glad that I had a chance to build this wonderful circuit! Thanks Juergen!

I've had it in tupperwear initially, but before I make a proper panel I have been thinking of a few simple mods and I'm just wondering if anyone else has tried these already:

1. tapping outputs from various stages (8, 12, 16, 20?? Something like this?) with a switch to choose between them.

2. Incorporating a VC sine/tri wave LFO. It would probably be useful to have VC control over the modulation rate, but I'm wondering, is there anything integral to the final phaser sound of the Tau that is specific to the onboard LFO?

3. Incorporating a dual VCA, to voltage control the LFO depth and the Resonance amount. I guess a Linear VCA for Rez and an Exponential VCA for LFO depth?

Does anyone have any suggestions about these add-ons for someone not too experienced in electronics (me)?

numbertalk · Posted: Mon Nov 24, 2008 8:51 am Post subject:

Hi Jürgen,

Could you please advise on properly setting the Pitch, Resonance and V/Oct trimmers?

Thanks.

jhaible · Posted: Mon Nov 24, 2008 10:29 am Post subject:

numbertalk · Posted: Mon Nov 24, 2008 11:17 am Post subject:

I guess I'm not clear on what the pitch trimmer is exactly. I understand the external manual "pitch" pot is for manual sweeping of the phaser, but what exactly does the pitch trimmer do?

Thanks!

jhaible · Posted: Mon Nov 24, 2008 12:31 pm Post subject:

numbertalk · Posted: Mon Nov 24, 2008 12:59 pm Post subject:

Cool, thanks.

numbernone · Joined: Aug 16, 2006 Posts: 477 Location: new york city

OK, finally gonna start building the TAU tonite.

Have not ordered the chips yet, and am wondering if a few folks might chime in regarding the chips they are using.

I was gonna go with the 2210's, having not really realized it will cost a hell of a lot less to do the ca3046s.

Any big difference between the 2? I know the docs mention low noise but I am not really worried about all of that jazz.

thanks!

Luka · Joined: Jun 29, 2007 Posts: 1003 Location: Melb.

there is a sound comparison on bridechamber tau page
the 2210 is a bunch cleaner
it just depends if you want a really clean phaser
i think there are reasons to go for both versions

i think ill go with the clean option as i will have a compact clone sitting next my tau

numbertalk · Posted: Fri Dec 12, 2008 8:26 am Post subject:

Hi Juergen,

I'm finishing up my Tau and had a couple questions - I'm building to a Bridechamber panel which does not include a space for the Colour/Inv switch. I think they intend the circuit to be hardwired in the "up" position, since they say to wire the single LED to the "Up" connector - just checking that to hardwire for Up I'd leave this Inv connection open - it looks like when closed it grounds the non-inverting input, which causes the output of that op amp to be inverted, right?

Bridechamber also doesn't include a spot on the panel for the Smooth switch - do you know which they intend to have hardwired - hard or smooth? What is more "typical" for a phaser?

Thanks!

jhaible · Posted: Fri Dec 12, 2008 12:54 pm Post subject:

numbertalk · Posted: Fri Dec 12, 2008 1:31 pm Post subject:

numbertalk · Posted: Sun Dec 14, 2008 2:47 pm Post subject:

Hi Juergen,

Just completed my Tau and had a couple questions.

First, when I turn the Osc Level pot all the way down and turn the Pitch pot (the one on the panel) all the way up, about 85-90% of the way up the signal drops significantly - is this normal? Tried adjusting the pitch trimmer but the range got way too limited before this improved.

Second, with slew limiting off (smooth set to "hard"), I'm getting clicking - I'm guessing it's happen where the signal "crosses zero"/fades a bit before sweeping back up. Setting it to smooth eliminates this, but is this normal and how could I eliminate this when using "hard" mode? To be clear it's not like LFO bleedthrough clicking - it's at the end/beginning of each sweep cycle.

Thanks!

jhaible · Posted: Sun Dec 14, 2008 3:14 pm Post subject:

numbertalk · Posted: Sun Dec 14, 2008 4:46 pm Post subject:

Hmmm. I think the clicking has to do with the same thing I'm asking about with the pitch.

Just to give me some point of reference, how do you have the pitch trimmer set on yours - about what percent of the way CW?

Thanks for the help.

numbertalk · Posted: Sun Dec 14, 2008 5:23 pm Post subject:

Plus is there supposed to be a volume drop when you switch to vibrato mode? I'm starting to wonder if it's one of my chips.

jhaible · Posted: Sun Dec 14, 2008 11:42 pm Post subject:

jhaible · Posted: Sun Dec 14, 2008 11:44 pm Post subject:

numbertalk · Posted: Mon Dec 15, 2008 7:53 am Post subject:

I think this might be an issue with the TL072 that I'm using for the LFO. I had a similar problem with a Dim-C clone I built recently - when the input resistance got too low I'd get similar behavior. Also when there's too little resistance - osc level all the way down and pitch all the way down - when I start to turn the pitch knob I get a weird sound right at the start on the way up. Also I'm only getting the clicks on hard mode when the osc level is cranked all the way up.

For the Dim-C it was recommend to try a TL062 or TLC2272 - I tried a TL062 but same problems so I just ended up putting enough resistance in series before and after the LFO pots tied to the 072 input. I'd rather not do that here - would replacing the TL072s with 2134s or TLC2272s possibly help to resolve this - is it an overrstable rail to rail op amp?

Thanks again for the help. It sounds fantastic otherwise.

jhaible · Posted: Mon Dec 15, 2008 10:43 am Post subject:

numbertalk · Posted: Mon Dec 15, 2008 10:57 am Post subject:

numbernone · Joined: Aug 16, 2006 Posts: 477 Location: new york city

Speaking of Bill and Will...where have they gone?

All the links are dead, and I cannot find any further info by googling.

I would love to revisit their info prior to finalizing these babies.