[sdiy] BBDs

[anthony]

Any flanger circuit that uses a 4046 for the clock (lot of others too) can be easilly modded for VC use.
Just mix a a jack for the CV and the original LFO. 100K resistors work fine.

Here's a really cool circuit:
http://home.debitel.net/user/jhaible/jh_storm_tide_flanger.html
It's a pretty big circuit though.

I'm working on one using 2 R5106's. (Probably more suitable than 3207's)
For the MN3207's if you need really fast clocking speeds (which you really do) - up to 1.5 MHz can be done - you need a buffer. Three inverters for each clock phase (using a 4049).

Here's a link for that:
http://www.hollis.co.uk/john/ultraflanger3.jpg
It's for MN3007 but I think it's not too rough to adapt. Just tweaking the bias and power supply.

There are schematics for flangers with MN3207's, but all of the reviews of these models are fairly poor. I'm guessing that too slow clock speeds were used so what they really were were more like tubular chorus.

A lot of the earlier flangers and choruses used SAD1024's and SAD512's and R5106's which have a higher rated max clock speed. These seem to be the more prized of the vintage flangers.

MN3207's work great for chorus though. The Dimension C used 2 and it's superb. Really to get blown away by chorus it should be stereo and the Dim C is true stereo. And even though it's pretty subtle it blows people away.

Here's another good starting point:
http://ampage.org/cgi-bin/hammer/index.cgi?cmd=lt&xid=&fid=&ex=&pg=1

I need to find the link to the flanger uses a 4007/4047 for the clock. 
If I can't find it I'll mail a scan of my handdrawn version.

All of these links have good chorus examples.
I hope that gets you started. (Hope I didn't over-answer)


----- Original Message ----- 
  From: dustin sedlacek 
  To: Seb Francis 
  Cc: Synth DIY 
  Sent: Thursday, June 16, 2005 4:39 PM
  Subject: Re: [sdiy] BBDs


  can these be used to make a VC flanger ? anyone have any schems ? 


  On 6/16/05, Seb Francis <seb at burnit.co.uk> wrote: 
    Hi All,

    I'd just like to make a quick recommendation about VisualSound .. they 
    are selling new MN3207 BBD chips (not old stock Panasonic) for
    reasonable prices ..
    http://www.visualsound.net/bbd.htm

    I just ordered a few from them and despite the fact that I'm in UK and 
    they are in US, they arrived very quickly .. and in fact the P&P cost
    was less than if I had ordered from a UK company!

    Seb






  -- 
  Dustin 
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