[sdiy] Need help on Eventide Instant Flanger FL201

[Jean-Pierre Desrochers]

Hi List,

It seams that my FL201 has an unusual "phaser card" installed
instead of a standard BBD MN3001 delay card...
Fortunalely to me the chips used are CD4066BCP, TL084, TL082, LM710CH
(easy to debug I think..)
But I wonder if I get this card working if I'll get a phaser sound
instead of flanging effect... ??


>
> ----- Original Message ----- 
> From: "Jean-Pierre Desrochers" <jpdesroc at oricom.ca>
> To: <Synth-diy at dropmix.xs4all.nl>
> Sent: Friday, September 18, 2009 12:54 PM
> Subject: [sdiy] Need help on Eventide Instant Flanger FL201
>
>
>>
>> Hi list,
>>
>> Recently I just bought an Eventide FL-201 Instant flanger and connected 
>> it
>> between an Harman / Kardon tuner output
>> and 1 input from my hifi amp to do some tests..
>> Well I cannot get any flanging from the unit so far...
>> Here is my setup:
>> One of the tuner output (left) connected unbalanced
>> to the (+) and C input screws repectively.
>> The flanger Main output (+) and C screws connected
>> to one of my hifi amplifier input still unbalanced.
>> When the LINE switch is pulled out everything is bypassed (no effect) OK.
>> When the LINE switch is puched in the LINE led lite OK.
>> Moving all the controls one at a time the dedicated leds lit
>> as supposed, the potentiometer called DOEPLER changes
>> the overall volume, not else, no effect with all other pots.
>> I read the flanger manual for the procedure to check
>> if the incoming signal is strong enough using the ENVELOPE FOLLOWER pots
>> and according to the book my incoming signal is strong enough.
>> (I know that a weak signal won't result to a good flanging effect).
>> The serial number is s/n 20785.
>>
>> Some months ago I ordered from Eventide a service manual
>> for the Eventide FL201 Instant flanger.
>> On receiving the manual I noticed the schematic missed
>> the important board called the delay board that plugs in
>> the center of the motherboard using an edge connector.
>>
>> Here are my questions:
>> -A schematic of the delay board used in this unit
>> would help me so much. If I can't get one I'll have
>> to reverse engineer all this board to understand its workings.. Painfull.
>> I'm ready to pay for that small board schematic.
>> Next are some details for your help
>> The motherboard behaves correctly. I mean all the IC's
>> working with the potentiometers work. I can see with my scope
>> the control voltage that drives the voltage controled clock
>> that sweeps the delay board but in the delay board no clock found 
>> anywhere.
>> The delay board uses these chips:
>> 4 X CD4066BCN (supplied @ 7VDC)
>> 3 X TL084 (supplied @ +/- 15vdc)
>> 2 X TL082
>> 1 X LM710CH
>>
>> - Is it normal there are no BBD delay chips on that board like most FL201 
>> have?
>>
>> - Can somebody sketch me a wiring connection to use with success
>> mono unbalanced / stereo unbalanced?
>>
>> -Do I need to use both MAIN & AUX outputs together
>> to get a flanging effect from a mono input?
>>
>> I use a lot of these type
>> of machines with success but now I suspect a dead delay board...hope I'm 
>> wrong
>> Your help is very important to me.
>>
>> J-P
>>
>>
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>