eml synthesizers

--- On Thu, 7/21/11, Nick Zampiello <newallianceeast@...> wrote:

From: Nick Zampiello <newallianceeast@...>
Subject: Re: [emlsynth] Re: converting 1.2 volt/octave to 1 volt/octave
To: emlsynth@yahoogroups.com
Date: Thursday, July 21, 2011, 8:48 AM

So, i knew something was confusing and i looked into my old emails...

dave wilson of NESM had explained it to me before and i just remembered it backwards:

"The Museum is doing well. The VCOs on the 200 are Hz/Volt, not Oct/Volt, so they can be made to

track your Korg MS-20 or your Yamaha CS-40M, but not an ARP or Moog synthesizer. The EML 101

has an output called "CM2" (Control Mode 2) that is a Hz/Volt output that can drive the 200's VCOs.

Older EML 101s have a CM3, same thing but high note priority for duophonic; More recent 101s have

a Sequencer input jack instead."

z

 

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From: George Mattson <axisair@...>
To: emlsynth@yahoogroups.com
Sent: Wed, July 20, 2011 8:40:28 PM
Subject: RE: [emlsynth] Re: converting 1.2 volt/octave to 1 volt/octave

 

The 200 is basically just a bare integrator IC with a UJT, cap and diode network in the feedback loop. The center frequency and both swings are all summed together after their input resistors into the ame op amp input as the feedback network. The diode and UJT act as choppers to produce the sawtooth output from the integrator.

 

The output of the op amp goes to the 470 ohm output impedance resistor and capacitively coupled to the two outputs, which are hardwired to each other.

 

There's no current control, differentiation or exponential amplifier. So, it doesn't look like it was designed with any sort of scaling capacity in mind. 

From: emlsynth@yahoogroups.com [mailto:emlsynth@yahoogroups.com] On Behalf Of sprgroups@...
Sent: Wednesday, July 20, 2011 3:45 PM
To: emlsynth@yahoogroups.com
Subject: Re: [emlsynth] Re: converting 1.2 volt/octave to 1 volt/octave

 

> The 200 and 101 oscillators are a non-standard 1.20v/oct

Are you sure about the 200? The schematic I've seen looks
like a V/Hz oscillator. Or was there a later version of the 200
(201?)

Steve