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Ibanez - FL-303 ( Flanger) [schematic]

PostPosted: 14 Apr 2008, 13:50
by Dirk_Hendrik
Fresh schematic stuff for y'all. Comments appreciated. Compliments also appreciated, especcially from others than others than the regulars' :wink:

http://www.dirk-hendrik.com/ibanez_fl303_fllanger.pdf

Re: [schematic] Ibanez FL303 flanger

PostPosted: 14 Apr 2008, 15:49
by MoreCowbell
Dirk_Hendrik wrote:Fresh schematic stuff for y'all. Comments appreciated. Compliments also appreciated, especcially from others than others than the regulars' :wink:

http://www.dirk-hendrik.com/ibanez_fl303_fllanger.pdf


Now THAT'S one I've been seriously interested in. I'd imaging that Stephen Giles will be along shortly to download it !

Thanks Dirk !

Re: [schematic] Ibanez FL303 flanger

PostPosted: 14 Apr 2008, 16:03
by MoreCowbell
BTW... "U5" doesn't seem to be labeled (at least I'm not seeing it)....

Re: [schematic] Ibanez FL303 flanger

PostPosted: 14 Apr 2008, 16:44
by Dirk_Hendrik
MoreCowbell wrote:BTW... "U5" doesn't seem to be labeled (at least I'm not seeing it)....


annoying schematic package... corrected.

Re: [schematic] Ibanez FL303 flanger

PostPosted: 14 Apr 2008, 17:38
by The Rotagilla
Much thanks!

Re: Ibanez - FL-303 ( Flanger) [schematic]

PostPosted: 14 Apr 2008, 18:35
by analogguru
:hmmm: Is this schematic now for the FL101A or FL101B pcb ? :roll:

and is it possible that R117 and R 131 are 24k and R103 and R127 are 2k4 ? And this Rx.... 30k ?

I mean this is only a question..... :roll:

analogguru

Re: Ibanez - FL-303 ( Flanger) [schematic]

PostPosted: 14 Apr 2008, 20:54
by bajaman
Thanks once again Dirk for your excellent schematic drawings :D
bajaman

Re: Ibanez - FL-303 ( Flanger) [schematic]

PostPosted: 26 Dec 2016, 02:51
by jreeves47
analogguru wrote::hmmm: Is this schematic now for the FL101A or FL101B pcb ? :roll:

analogguru


FL101A as only the B has the LED

Re: Ibanez - FL-303 ( Flanger) [schematic]

PostPosted: 18 Aug 2019, 14:24
by mirosol
Hi.
I'm trying to fix one, board revision B. It's an old unit, but in very nice overall condition. Even has the box, papers and stickers intact. According to cap codes, this unit is from '78. There seemed to be an issue with the LFO, so i replaced C122 and C12 with suitable new caps. Got the LFO and clock running. Or so i think. I got the LFO pushing the clock from around 9.0V to 11.8V. And the PHI_1 and 2 contacts pushing the SAD1024 at 5.9-6.1V. The bias for the BBD is set at 4.9V for BBD pins 2 and 15. Chip is getting the 12V at VOSC and as far as i can see, everything should be ok. However, the signal gets to the input of the BBD, but there's no signal at the pins 11 and 12, even with the level trimmer maxed. I'm reading 7.9-8.1V at those pins.

Reason i'm asking here is that if someone would know if those voltages mentioned are correct. And if so, could the SAD1024 be my issue? Clean signal is ok and as far as i can tell, everything else is as well.

Re: Ibanez - FL-303 ( Flanger) [schematic]

PostPosted: 18 Aug 2019, 20:45
by plush
mirosol wrote:And if so, could the SAD1024 be my issue?


I've met quite a lot of bad 1024s (like 20 or 30 I dunno) through the last couple of years. All were missing signal on one or both outputs. Sad stuff, Mirosol :(

Re: Ibanez - FL-303 ( Flanger) [schematic]

PostPosted: 19 Aug 2019, 05:57
by mirosol
Sad indeed. I only recall seeing one or two dead ones. In this case i want to be completely sure before calling it. Mainly due to everything else (box etc.) being in near pristine condition. Paying ~100 bucks for a used donor part isn't an option.

The box has a price sticker on it as well. A local music store's price of 677mk (that's finnish marks).

Re: Ibanez - FL-303 ( Flanger) [schematic]

PostPosted: 19 Aug 2019, 09:40
by plush
mirosol wrote:Mainly due to everything else (box etc.) being in near pristine condition. Paying ~100 bucks for a used donor part isn't an option.


AFAIK, 1024s are prone to degradation over time, even when not been used, so investing in NOS chip can be a really bad choice (it can be dead or half dead or on it's way to it's grave).

There must be some odd japanese stuff using 1024s, that can be bought for cheap, I'd look for it on ebay or local JP auctions.

Re: Ibanez - FL-303 ( Flanger) [schematic]

PostPosted: 19 Aug 2019, 14:21
by Dirk_Hendrik
I cannot subscribe to that age-ing.
The main and major reason for 1024's to die is because they're handled without ESD precautions. NOS does not say anything about how devices are handled. Similar the tag "original packaging" must be taken with quite some salt for a device that easily is 50 years old and may be repackaged 40 years ago already.

Re: Ibanez - FL-303 ( Flanger) [schematic]

PostPosted: 19 Aug 2019, 14:56
by plush
Dunno, we've had some original 1024s, that were stored in conductive foam and esd-safe packaging, that were used couple times for reference and testing purposes. Another one was inside maxon chorus/flanger, can't tell the model. Some time later and <<BAM!>> one of reference ic's outputs is gone, maxon-one died couple of shelf monthes later, followed by enormous frustration. Testing stand was grounded and used tvs-diodes for protective purposes.
Maybe it's just a coincidence, maybe not.