Eventide Instant Flanger FL201

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jpdesroc

New member
Joined
Oct 7, 2014
Messages
1
Hi list,

I browsed a couple of times your web site
to 'seek' some informations about the inner
behaviour of some flangers, specifically
through zero flangers (??) like the Eventide Instant Flanger FL201.


Here are my questions:
I recently bought an Eventide Instant Flanger FL201 and
am wondering on how to use its 'through zero' possibilities.

- First is it a through zero device capable ?
(looking at its MN3001 BBD's arangement I think it should.. ??)

To do some tests I plugged one of an FM receiver output to the FL201 input
to get a wide freq source. Then I wired the MAIN out to my monitoring amplifier (mono test).
From there I pushed the POWER and LINE buttons to get the flange effect. Ok.
I then made sure all the other buttons were not pushed and BOUNCE pot to minimum.
I then pushed the MANUAL button in and rotated its pot from min to max.
Here what I found:
The min got me the maximum BBD time delay and
going from pot min to max I could here the flange effect
getting 'thinner' until I reach the max position BUT NO THROUGH ZERO CROSSING...
of the flange effect..

-Is it normal ?

(I thought it should have crossed the ZERO SPOT around the midlle of the pot ..? )
It looks like one of the 2 BBD's are letting the signal pass through
keeping the unit from reaching the ZERO SPOT like most standard Flanger do...
Or maybe the inner configuration won't ever produce a through zero effect
but instead get close to the zero spot..??
Plugging both MAIN and AUX outs to my amp doesn't make the zero crossing appears nether.

I'm making a reverse engineering of all the delay board that uses MN3001 BBD's
since Eventide has no schematic of it available. With all the schematic of that board
it's gonna be easier to target the board's normal behaviour.


What do you think ?
 
What do you think ?

What do I think ?

Hmmm...  so this is you first post..... I understand...... There has been developed a search engine called "google". If you type in "Eventide", "FL201" and "schematic" this search engine delivers you on top the user manual for download:

http://neo.eventide.com/marketing/ads/anthology%2520ii%2520cd/Documentation/Original%2520Clockworks%2520Manuals/Instant%2520Flanger%2520Manual.pdf

It is recommended to read it.

when you switch for pictures, the first hits of this search engine lead you to this thread:

http://groupdiy.com/index.php?topic=19937.0

And - oh wonder - you will find there the schematics of the Eventide FL201 including the BBD-board.  So you can use your time for reading the user manual instead of tracing the BBD-board.

 

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