MOTM

I've made some first tests with my version of the Tau/Aries/ARP-inspired 
20-pole Phaser.

Sound demos (mp3 format) are available:

http://electro-music.com/forum/phpbb-files/jh_tau_demo_1_115.mp3
(White noise, and single VCO saw wave gated by Trapezoid, from Synthi Clone.
Run thru the Tau, added a little bit of reverb, recorded with Tracktion.)

http://electro-music.com/forum/phpbb-files/jh_tau_demo_2_korg_drums_181.mp3
(Two stupid drum patterns from my Korg Electribe.)

http://electro-music.com/forum/phpbb-files/jh_tau_demo_3_lambda_clavi_161.mp3
(Me playing the Clav sound on the Korg Lambda and my 5-year-old son Tassilo 
turning the knobs of the Phaser.)

http://electro-music.com/forum/phpbb-files/jh_tau_demo_4_lambda_strings_604.mp3
(Lambda Strings, also with Tassilo on the Phaser knobs)


Picture of the finished module:
http://electro-music.com/forum/phpbb-files/tau_prototype_testing_photo_214.jpg

(What I will make available is not finished modules; just the naked boards 
as shown here:
http://electro-music.com/forum/phpbb-files/tau_prototype_pcb_photo_203.jpg)

If you want to follow this project further, I'm making updates and announce 
prices on the electro-music forum:
http://electro-music.com/forum/viewtopic.php?p=124764#124764
I've chosen this way simply because I can put up pictures and audio files 
there, so I can document this project without making a web site of my own 
for it. (This will probably come later.)
I hope it's ok to cross post this to the other lists from time to time, 
without being considered spam.
If it's getting too much on AH and the MOTM list (I guess it's welcome on 
synth-diy), please let me know and then I'll only post again one more time, 
when I'm ready to accept orders.

JH.

On 6/16/07, JH. put forth:
>I've made some first tests with my version of the Tau/Aries/ARP-inspired
>20-pole Phaser.

Those are some nice demos.  I have a few questions about this thing.
I'm guessing that it's intended as a "table top" unit to be run off
its own transformer (I see large voltage regulators and two big
cans).  Is that correct??

Do you have a link showing what the front panel would look like??
The reason I ask is knowing how many knobs and jacks it requires
would give me a much better idea how much t would cost to build.  Is
there a parts list?? It looks like CA3086 are available for less than
a dollar each.

>http://electro-music.com/forum/phpbb-files/jh_tau_demo_3_lambda_clavi_161.mp3
>(Me playing the Clav sound on the Korg Lambda and my 5-year-old son Tassilo
>turning the knobs of the Phaser.)

It sounds like he is off to a good start :)

>Those are some nice demos.  I have a few questions about this thing.
>I'm guessing that it's intended as a "table top" unit to be run off
>its own transformer (I see large voltage regulators and two big
>cans).  Is that correct??

Table-top, 19" rackmount, oversized stompbox - whatever you want.
It's designed such that it can be supplied by a 18V AV wallwart; all the
required components are on the board already. Or you can use your own 
transformer
(toroidal transformer, and 2 x 18V recommended), plus the usual fuses and
mains voltage connector.
Or, you could omit the PSU components completely, and connect it to +/-15V
stabilised power supply as ausein in MOTM. (There is no MOTM, or other 
standard
connector, nor pcb mounted pots, though; so you'd need some mechanical 
skills
to integrate it into a standard MOTM module.

>Do you have a link showing what the front panel would look like??
>The reason I ask is knowing how many knobs and jacks it requires
>would give me a much better idea how much t would cost to build.

This depends: whether you want an input level potentiometer, two output
level potentiometers, bypass switch, stereo channel reverse switch, mix
inversion switch, vibrato/phasing switch, etc.

Without all this, you have:
"Pitch" 100k lin for manual sweep
"Resonance" 100k lin for regeneration
"LFO Rate" 100k log
"Osc Level" 10k log

You might to add a small V/Oct adjust pot on the front panel also.


> Is there a parts list??

Not yet.

>It looks like CA3086 are available for less than a dollar each.

And the (slightly better) CA3046 isn't more expensive, either!

JH.

JH writes:
>>I've made some first tests with my version of the Tau/Aries/ARP-inspired
20-pole Phaser.<<

Interesting.  It sounds more like a flanger than a phaser, maybe because of
the the spacing of the filters.  It even does a through zero type flanger
sound.

-Elhardt

> It even does a through zero type flanger sound.

It has a true 1/x modulation law, and 1/x for _frequency_  means just x 
(i.e.
linear) for time modulation, so it does a quite convincing emulation of one 
tape
flange gaining on the other, and eventually overtaking it.

JH.