[sdiy] ETI447

[Tim Parkhurst]

VERY nice! Good job. I think I preferred the sound of the 11-stage setting
over the 12. Is there some difference in the addition/cancellation patterns
when there are an odd number of stages (versus an even number)?

Thanks for sharing your results. Nice job on the enclosure, too!


Tim (odd number) Servo

"Imagination is more important than knowledge." - Albert Einstein




> -----Original Message-----
> From: Rönnberg Niklas [mailto:nikro at itn.liu.se]
> Sent: Monday, August 09, 2004 4:06 AM
> To: Synth-Diy (E-mail)
> Subject: SV: [sdiy] ETI447
> 
> Well, you were right. The 4049 shouldn't be buffered. I'm still using
741's
> but I'm planning to try to change these to OP27. Do you know where I can
> buy these in Sweden, or by mail?
> 
> Here are some sound samples:
> http://www.itn.liu.se/~nikro/diy/phaser/eti447se.mp3
> The string sound is made with a digital synth, but what are the other
> sounds made with... ? ;-)
> 
> Here are some more samples:
> 1 stage (not that good...)
> http://www.itn.liu.se/~nikro/diy/phaser/eti447se_1stg.mp3
> 2 stages (starting to sound like a phaser)
> http://www.itn.liu.se/~nikro/diy/phaser/eti447se_2stg.mp3
> 6 stages (ETI original)
> http://www.itn.liu.se/~nikro/diy/phaser/eti447se_6stg.mp3
> 11 stages
> http://www.itn.liu.se/~nikro/diy/phaser/eti447se_11stg.mp3
> 12 stages
> http://www.itn.liu.se/~nikro/diy/phaser/eti447se_12stg.mp3
> 
> And some photos:
> http://www.itn.liu.se/~nikro/diy/phaser/eti447_1.jpg
> http://www.itn.liu.se/~nikro/diy/phaser/eti447_2.jpg
> http://www.itn.liu.se/~nikro/diy/phaser/eti447_3.jpg
> http://www.itn.liu.se/~nikro/diy/phaser/eti447_4.jpg
> 
> Thanks for your help with this project!
> 
> Regards
> 
> /Niklas
> 
> -----Ursprungligt meddelande-----
> Från: Steve Ridley [mailto:spr at spridley.freeserve.co.uk]
> Skickat: den 11 juli 2004 01:10
> Till: Rönnberg Niklas
> Ämne: Re: [sdiy] ETI447
> 
> 
> I haven't looked at the ETI447, but I've seen similar
> circuits and...
> 
> > I have hade some problems with IC9, and I know that you guys can help me
> > and explain this to me. I have tried some brand new Philips HEF4049BP
and
> > it's impossible to get these to work. So I replaced the new IC with an
> old
> > and dusty MSM4049RS, and everything is getting to work perfect. What's
> the
> > difference?
> 
> 4049BP sounds like a buffered output version - that's
> what the B stands for.  I guess the IC is being (mis)used
> as an analog IC, and buffered CMOS doesn't work.  It
> speeds the IC up as a logic IC, but it makes it non-linear.
> 
> Look for unbuffered 4049s - they may have the letters "UB"
> (for unbuffered) in the name, eg 4049UBP.
> 
> 
> Steve
> 
> 
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