In case you wanted a through-zero-flanger

[Bill Bergman]

Had me fooled :shock:

[puretube]

isn`t it a little bit like converting the "Zombie" chorus or the "Ultra-Flanger" to use MN3207...
...like this one, that seems to have not been finished yet:
http://diystompboxes.com/sboxforum/viewtopic.php?t=17588&postdays=0&postorder=asc&start=0

why not buy the chips here:
http://www.dialelec.com/750.html :

TDA1097 IC¦TDA.1097 DELAYLINE BUCKBRIG 1536STAGE 8  19.94 (GBP)

or here:
http://www.stuutenbruin.com/compo.html

or here:
http://www.autogarduk.com/stock%20list.htm

or here:
http://fibra-brandt.com/cgi-bin/fibra.cgi

or:
http://www.telepart.co.uk/telepart/

or read more here:

R.M Marston.
Audio Circuits Manual.
1989 by Hieneman Newes.
ISBN 0-434-91210-7.
BJ: Talks about basic applied OP AMP and discrete AMP designs. VCA design around LM13600,NE570/1.
Bar Grap displays using LM3914/15/16,U237/47/57/67 IC's. And a lot of BBD designs, schemos for Chorus, Delays, Flanger, Phaser,etc using MN3005,MN3004,MN3011,TDA1022,TDA1097,SAD4096,SAD512,SAD1024. Well written ,easy to understand for the novice, no math, a application book. One of the few books i have come across who talks about BBD designs. A nice little pocket book ,Most recomended by BJ.

data:
TDA1097 1 x 1.536 cellen, P-kanaal enhancement MOSFET, -18 V voedingsspanning, 5 tot 100 kHz symmetrische clock, DIL-8, Philips....




[/url]

[Bill Bergman]

2 @ $20+Shipping to U.S= $$$$$$Flanger

[Mark Hammer]

I just posted a semi-redraw of the Infinite Flanger schematic at my site (hammer.ampage.org).  The schematic was extracted from the scan, blown up, retouched, and all part numbers replaced with part values.  That makes it a little easier to follow, and print out a little better.

In case it was not apparent to you before, the Infinite Flanger has no on-board LFO.  You either have to work it by hand (or foot) or provide some external control source.  Truth be told, it's probably the sort of thing you want to work by hand in post-production anyways.

Enjoy
Mark

[Bill Bergman]

I'm  thinking about  making one. :wink:

[puretube]

...another round of BBD-circuit: "how to mod?" is opened

[uncle boko]

Mark - I've emailed you a drawing of the HSR Modulation Oscillator - let me know if it hasn't arrived, as AOL was playing up yesterday.

[Bill Bergman]

I've  re-drawn the pcb layout for Press-n-Peel transfer, but I still needed to double check it.

[Mark Hammer]

It did arrive, but I needed to forward it to my work account to be able to get at the attachment.  I'll respond from there.

Cheers,
Mark

[Bill Bergman]

I think TR3 and TR5 have their labels swapped on the original pcb layout.

[Mark Hammer]

Yeah, Bill, I'm pretty sure you're right.  There are 4 NPN's and one PNP listed, so something is amiss.

[Bill Bergman]

Any idea where R54 & R55 are in the schematic?

[puretube]

R54 in the schem. is the working resistor of IC7, in the PCB north of C34;
R55 is labeled R53 in the schem (analog to R54, but for IC3), south of C14 in the PCB-layout....

[Bill Bergman]

Are these revisions to the original layout that need to be wired in?..... I guess I should read the text. It may be documented there.

[puretube]

seems like those 2 Rs seem to have been forgotten in the schem and in the PCB at 1st instance, and drawn into both afterwards.
But they are neccessary for any BBD (they go to ground imstead to V+ in 3207 circuits...

[Bill Bergman]

Thanks, Puretube!  I guess I'm going to build it and worry about the  TDA1097's later.

[puretube]

...there`s really not much to do to tweak this circuit to "common" BBD-usage.
e.g. like two "modded Zombies" : convert the analogue circuit left and right of C10 and C15/C35 to one single V+ first, check the polarities of the modulation control/BBDs, and find a solution for the LED-control round IC1....

[Bill Bergman]

Are you saying that this isn't really a worthy project to build?

[puretube]

...not at all.
Any TZF project is worth the build and the listening to it.
The pursuit of a TDA1097-thing exactly like the circuit this thread is about,
is too much.
Like Mark H. posted often enough: Any 2 delay circuits differing in a delta-t where delta-t approaches 0, goes to and thru 0, and inverts the ratio of the 2 delays beyond that, will do the trick.

But the trick isn`t neccessarily in the circuit of this thread per se.
Any combined 2 DIY delay circuits, will do the thing...
just divide the circuit into its functioning blocks, and you will be able to adapt any known (2) circuits to get the desired sound-effect.

[Bill Bergman]

"Any TZF project is worth the build and the listening to it.
The pursuit of a TDA1097-thing exactly like the circuit this thread is about, is too much. "

If I get what your saying, any TZF is worth building, but there's no particular magic to this particular one and it may not be worth persueing TDA1097's to build it?        Sorry for the confusion.

If you haven't seen me before here at the forum,(I used to build several pedals a week. Now only one or so a year. I was an addict), I build from you guys' designs. I don't have the background to improvise a circuit. So when I see something interesting or unusual  like a TZF flanger ( I have an affliction for flangers) I get interested.