SV: [sdiy] ETI447

[Rönnberg Niklas]

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