[sdiy] Chorus unit

[Goddard, Duncan]

I'm prompted by this to apologise to anyone who's waiting for me to send
them something out of my attic. the poly-6 is waiting to be sent to mr
allgood, he oakley systems and very patient bloke. there's this arpeggiator
thing and a kahler human clock too. I will try to get to the post office
this week, hinest.

d.

> ----------
> From: 	Mike I.[SMTP:mirwin1 at istar.ca]
> Sent: 	11 February 2001 18:33
> To: 	Paul Maddox
> Cc: 	synth-diy at node12b53.a2000.nl
> Subject: 	Re: [sdiy] Chorus unit
> 
> Hi Paul,
> Take a look at the Korg Polysix schematics - the board labelled KLM-368 
> is a fairly standard (but well-implemented) 3-phase chorus complete with 
> companders. It can be operated in chorus - "phase" - ensemble modes. The 
> typical 3-phase ensemble circuit uses 3 parallel BBD's - left output is 
> composed of BBD1 out + BBD 2 out, while right output is composed of BBD 
> 2 out + BBD 3 out. The direct signal is not mixed in. Some Roland stereo 
> choruses use two parallel BBD's, BBD 1 out going to left, BBD 2 out 
> going to right, again, with no direct signal. Simple one BBD choruses 
> such as the CE-1 produce a pseudo-stereo output by feeding the direct 
> signal to one output, and the delayed signal to the other output. 
> Another possibility is to use the sum and difference technique used in 
> phasers.
> Mike
> 


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