[sdiy] Achieving through-zero flanging using 2 PT2399 echo IC's

[jpdesroc at oricom.ca]

The PT2399 specs say the IC minimum achievable delay
is around 30-35mesc.
That's why I figure sweeping between 35-45msec.

JP

---- Message original ----
De: controlvoltage at gmail.com
A: jpdesroc at oricom.ca
Objet: Re: [sdiy] Achieving through-zero flanging using 2 PT2399 echo
IC's
Date: Wed, 9 Jan 2008 09:21:10 -0500

>pardon my ignorance,
>is there a good reason to set 40ms of delay on the "zero" chip?
>Something about the PT2399?
>
>Otherwise it seems you'd get the same effect with lower "latency"
>by setting one delay = 5msec and sweeping the other from zero to
>10... er,
>well since you can't break the laws of physics and have a bucket
>brigade with zero delay,
>I guess what I am saying is set one chip to "absolute minimum plus
>5ms" and sweep the other one from absolute minimum to abs.minimum
>plus
>10msec.  Make sense?
>perhaps 35ms is the minimum for the PT2399, and you are already ahead
>of me... :)
>
>On Jan 9, 2008 8:32 AM,  <jpdesroc at oricom.ca> wrote:
>> Hi list,
>> Just an idea..
>>
>> Using 2 PT2399's echo IC's side by side,
>> setting a working delay of around 40msec
>> for the first IC and the other
>> swept from 35 to 45msec would it be possible
>> to achieve a through-zero flanging?
>> I think so..
>> What do you think of the idea?
>> The only problem I'd see is aliasing between them.
>> I just bought 10 PT2399's on eBay at $20.00
>> and think it's a good deal.
>> JP
>>
>>
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