TZF Electric Mistress W/ MN3207s (Concept)

[Scruffie]

Hey all,

I've been following a few threads here about the EHX Electric Mistress... recently Thomeeque converted it to work on MN3007s or 3207s, here's the schematic for the converted 3207 version that he did - (He's stated that it's still a work in progress to get it right, but the bare bones of the circuit are there for use)
http://thmq.mysteria.cz/em3207/sch/EM3207_v1_0_diffs_1280.gif
and the thread -
http://www.diystompboxes.com/smfforum/index.php?topic=78270.0

Oldschoolanalog confirmed it with the 3007s using this with a few tweaks -
http://thmq.mysteria.cz/em3007/em9v_sad_repl_v0_1.gif

Anyway... while following the thread, I brought back up this thread from 2006 and thought some people might be interested -
http://www.aronnelson.com/DIYFiles/up/TZF_Mistress_v11_project_file.pdf
A project file for making a SAD1024 version of the Electric Mistress have TZF capabilities... so, I wondered if anyone about here with a bit more knowledge (and a larger parts stock and breadboard) was interested in finally bringing a simple TZF flanger project to life... I don't see how converting the TZF board to use either the 3007 or 3207 would be any harder than the main board.

Any thoughts?
Scruffie.

[Mark Hammer]

Delay is delay is delay.  TZF doesn't really care how one achieves it, as long as one path/channel is a fixed delay offset that exceeds the minimum delay achieved by the swept signal.

If a person has a currently functional flanger of ANY type, using ANY BBD, there is no reason why they cannot simply add a daughter board with a BBD set for a constant or adjustable fixed delay (say, anything between 250usec and 3msec).  The daughter board gets inserted in the "dry" path so that the mixer stage combines the swept delay, and the offset signal.

The swept flanger could use an SAD1024, an SAD512D, MN3007, or an MN3207, or whatever, and the fixed delay could use an MN3009,MN3007, MN3207, TDA1022, SAD1024 (aqssuming you can find one) or whatever.

I guess the question I would have is what anti-noise precautions would one have to take, given that the fixed delay would be so short that the clock signal is not going to be within hearing range.

[Scruffie]

Yes I understand TZF is achieved the same way every time, the idea was for more of a put together project that would use available chips, the design's already there, it just needs tweaking and assembling.

I remember reading about you saying that you could put 2 Electric mistresses together, stick one in filter matrix mode and the other into it and could coax TZF settings out at some points.

Yes they could use different parts, but it'd be nice to have it all assembled into a single PCB using available chips (I don't think i'll ever be seeing a SAD512) also, wouldn't having different clocks possibly lead to problems? Different chips need to be clocked at different speeds or am I getting confused?

In the original SAD1024 thread he mentions that there was noise originally... but upon boxing and assembling it properly rather than with crocodile clips it was perfectly silent, so hopefully, it'll be fairly straight forward... *famous last words*

[Mark Hammer]

Yeah, I guess my post was a little forceful.  Certainly sticking it all on one thoughtfully laid-out board is a great idea.  Couldn't agree more.  What I was aiming at is the notion of a drop-in daughterboard that current owners of non-TZF units might be able to use, regardless of what BBD happens to be used in that unit for the swept delay.

As for the project of mine you note, I think I better set some other things I'm working on aside and actually get that one actually working, rather than just talking about it.  It's about time.

[Scruffie]

Oh I didn't take it as forceful, no need to appologise, you give out alot of advice to people with pipe dreams and i'm sure saying the same thing over and over gets a tad boring...

Ah I see, yes a drop in daughter board could be handy, I like having things all on one board if possible so the Electric mistress with all its blocks here was the obvious choice to put together a whole project, that and having never actually tried an Electric Mistress 

But with something like the A/DA units that alot of people have (including myself) a drop in board would certainly be handy, just like drop in Double Delay boards for BBD chips are handy to get alot more out of a circuit quite simply.

Oh I thought you'd already actually tried it from what I remembered reading, in that case, good luck with it!