Weekend TZF mp3!

[Vsat]

Processed the Hip off the FM radio... with a single SAD1024A.


http://media.putfile.com/TZ-8

Cheers, Mike

(webspace courtesy of www.putfile.com)

[Chico]

Mike:

Nice clip.


Would you be willing to share some details on your circuit?

To get tzf, did you opt to run the chip as 2x512 or some other configuration?  If the 2x512, did you fix one of the delay blocks or are they both modulated?  Finally, did you use companding?  

Best regards

Tom

[Vsat]

Chico,

New design, no schematic available for release at this time.

However, a tip for anyone experimenting with TZ-flanging or any fx where BBDs run on separate clocks:  providing a very low-impedance drive for the BBD inputs will eliminate most of the "heterodyne" noise. The standard input coupling methods shown are very susceptible to pickup of noise from nearby clocks, this produces aliasing when sampled by the BBD.  An improved approach (using emitter followers, but still not ideal) was shown in the DC-2 chorus where two BBDs are used. The standard technique of bypassing the input with a small cap (typically 220 pF to 1000 pF) is not an effective solution.
Cheers, Mike

[Vsat]

Forgot to add - there's no compander or noise gate on this unit  - very quiet as is, quite suitable for live use. No shortwave radio squeals.
Cheers, Mike

[Chico]

Mike:

Points well taken, thanks for the tips.

Best regards

Tom

[DiyFreaque]

Yea, verily, on both the sample and the tips.

Cheers,
Scott

[puretube]

here`s hoping to sit @ the "sound"-PC tomorrow...

[StephenGiles]

Very nice indeed Mike, was that a manual sweep or some bounce in there?
Stephen

[Mark Hammer]

Mike is simply way too modest.  Check this one out: http://www.modcan.com/bseries/flange.html

[Vsat]

Steve,
It's running on the LFO - set to sweep thru-zero and "out the other side", and back again, rather than "up to zero and return".
Cheers, Mike

[Vsat]

Mark,
Errr... same guy  :O   but different technology  

The Modcan perhaps the only flanger with an SSM2164 inside BTW.
Cheers, Mike

[StephenGiles]

Mike - I've been studying your clip again, the drummer isn't Kenny Aronoff by any chance is he?
Stephen

[Vsat]

Steve,
No idea! The Tragically Hip are from Kingston, Ont., when I was living there we'd occasionally spot them at one of the local eateries on Tuesdays. We were regulars at this particular restaurant.

Circuit board now being put into 1u rack enclosure!
Regards, Mike

[puretube]

information lost...

[Vsat]

Thanks Puretube  

Without going into the details, it uses an approach  which more accurately models the processes taking place during actual reel:reel flanging. Not as simple as one would think based on the written descriptions.
Regards, Mike

[puretube]

information lost...

[Vsat]

Puretube,
Yup, same stuff discussed in that thread, with several implementations.  Friend demo'd actual reel:reel flanging for me at his studio... it was possible to obtain quite uninspiring results, even with otherwise good program material    

This could be remedied, however, by making the process less "perfect", as discussed in the thread.

Incidentally, Sebastian's delay circuit produces a very good approximation of a pure time delay.... and it is capable of producing near-perfect cancellation, which is to be avoided if the classic tape flange sound is the goal.  However, it provides a very nice means of eliminating a 2nd BBD with attendant  "heterodyne" problems, as well as eliminating the need for a chain of noisy variable allpass stages, as might be used in an alternative approach. Also, companders/noise gates sometimes make things worse, rather than better, particular with the simpler designs seen in many fx units, nice to avoid them if possible.
Cheers, Mike

[puretube]

information lost...