Eml synthesizers

my friend just put some EML stuff on ebay, some interesting modules, + he has parts as well.  
Lots of Arp stuff also.
http://search.ebay.com/_W0QQsassZsymbiosismQQhtZ-1

i'd love to see any more info on these modules, was there a real EML modular?


best,
phil

Hi Phil,

 

I see your friend is in Seattle. So am I.

 

I have all of these modules and documentation for them.

 

EML sold the modules independently and left the panels, box, graphics, knob
choice etc. up to the consumer. I actually used one of the LFO modules run
on 2 9V batteries to drive two tri-color LEDs mounted on a modified pair of
sunglasses frame  as part of a Halloween costume. 

 

Your friend might want to e-mail me if he needs copies of the documentation.

 

George Mattson 

 

  _____  

From: emlsynth@yahoogroups.com [mailto:emlsynth@yahoogroups.com] On Behalf
Of pzlonvent
Sent: Wednesday, May 17, 2006 8:33 PM
To: emlsynth@yahoogroups.com
Subject: [emlsynth] Wild EML modules + parts on eBay

 

my friend just put some EML stuff on ebay, some interesting modules, + he
has parts as well.  
Lots of Arp stuff also.
http://search.ebay.com/_W0QQsassZsymbiosismQQhtZ-1

i'd love to see any more info on these modules, was there a real EML
modular?


best,
phil







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Interesting.  I've heard about these things, but this is the first time
I've ever actually seen any.  I'm guessing that the four pots on the
keyboard interface module are perhaps coarse tune, fine tune,
scale, and glide, based on the interface in the EML 101.
(However, the 101 doesn't have a coarse tune in the keyboard
interface.)  If it's the same basic circuit as the 101, then it 
interfaces
to an EML duophonic keyboard with Pratt-Read mechanicals.
The circuit is rather trick and you have to know what you're doing
to interface a non-EML keyboard to it.  Also, if it's like most EML 
stuff,
the output is scaled normally to 1.2 V/octave.

The VCO is interesting to me because of the two DIP ICs (741s probably).
My 101 was built without any DIP-packaged ICs -- all the ICs in it are
in metal cans.  I'm a bit curious as to what all those switches are for 
--
waveform selection?  One of those metal can ICs is likely to be a uA726,
which is a very valuable part.

The ADSR caught my attention too.  It must have been a more recent
design, because the 101 doesn't have ADSR envelopes -- only ADS
or ASR, depending on a switch selection.  Incidentally, those pots
aren't particularly rare or valuable, nor can they be easily fitted to a
101, because all of the 101's pots are panel mount.

And finally, my guess is that the mystery boards are VCAs.  The one
with the gray caps looks to be a later revision.  It would be great if
they were copies of the fancy VCA from the 101, which has both
two-quadrant and four-quadrant inputs, but they don't look "busy"
enough to be that.

> i'd love to see any more info on these modules, was there a real EML modular?

The VCA is almost certainly the one from the 400.  The schematic is
in the files section of this group.  Can't help with the rest.


Steve

Interesting.  I've heard about these things, but this is the first time
I've ever actually seen any.  I'm guessing that the four pots on the
keyboard interface module are perhaps coarse tune, fine tune,
scale, and glide, based on the interface in the EML 101.

 

Actually, The KB-1 and KB-2 modules and tech sheets I don't seem to have.


(However, the 101 doesn't have a coarse tune in the keyboard
interface.)  If it's the same basic circuit as the 101, then it 
interfaces
to an EML duophonic keyboard with Pratt-Read mechanicals.
The circuit is rather trick and you have to know what you're doing
to interface a non-EML keyboard to it.  Also, if it's like most EML 
stuff,

 

I have to assume the KB-1 is just you're typical single Vc output
voltage-divider type keyboard, while the KB-2 has the 2nd note computer on
board similar to the 101.


the output is scaled normally to 1.2 V/octave.

 

Actually, according to the tech sheets for the Exponential Amplifiers, it
instructs as to how to tune the keyboard module output to 1V/Octave, adjust
the linearity so the middle of the keyboard is on-track, and then adjusting
the exponential amplifiers to a 2:1 ratio. i.e. the amplifier doubles the
voltage coming in. 1V in is 2V out. 2V in is 4 V out, etc.



The VCO is interesting to me because of the two DIP ICs (741s probably).
My 101 was built without any DIP-packaged ICs -- all the ICs in it are
in metal cans.  I'm a bit curious as to what all those switches are for 
waveform selection?  One of those metal can ICs is likely to be a uA726,
which is a very valuable part.

 

The ICs used in the 101 are mostly metal-can op-amps: They were almost pre
DIP packaging.

Oscillator and filter control mixers, Reference voltage source and the
second note computer are all 741's.

 

The glide circuit uses 741's, the keyboard sampler uses 748's.

 

The exponential amps use 741's and 1456's

 

Oscillators 2 and 3 use 741's entirely and through the waveform selection
pot and as the osc output buffer amp.

 

Actually, all of the rest of the IC's in the 101 schematic are either 741's,
748's or 1456's with the lone exception of a 301 used for the noise source.


The ADSR caught my attention too.  It must have been a more recent
design, because the 101 doesn't have ADSR envelopes -- only ADS
or ASR, depending on a switch selection.  Incidentally, those pots
aren't particularly rare or valuable, nor can they be easily fitted to a
101, because all of the 101's pots are panel mount.

 

The attack and decay pots on the 101 are just simple AB J-type 1M linear
pots. No center-tap on these. The sustain pot is a simple AB J-type 5K
linear pot. 

 

The Attack, Decay and Release pots on the circuit module are 1M AB mod pots
and the sustain is a 5K AB mod pot. They have the same mounting hole size as
the AB J-type sealed pots and use the same hardware. So, they can be subbed
into the 101. You have to solder the leads in either case and EML started
panel mounting mod pots when they built the Syntar for me. I'd rather power
up the ADSR module and patch the 101 through it. (which I have done)


And finally, my guess is that the mystery boards are VCAs.  The one
with the gray caps looks to be a later revision.  It would be great if
they were copies of the fancy VCA from the 101, which has both
two-quadrant and four-quadrant inputs, but they don't look "busy"
enough to be that.

 

Well, I just went through every circuit module tech sheet, the 101, 200,
400-401-416, Poly-box and Syntar schematics and board layouts and didn't see
anything similar to that board nor any part listing of a 3026. 

 

So, it's still a mystery.

 

George Mattson 






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  _____

Sorry guys, I lied. The 3026 is actually a DIP package with 6 NPN
transistors inside. Two of the transistors are precisely matched. EML used
it in their systems for the modulator/ amplitude shaper circuit on the 101
They use the matched pair for the differential input circuit and string the
other 4 into a constant current source to specifically heat the chip in
order for it to work in a constant-temperature environment for stability
purposes.

 

George Mattson

 

  _____

I've auctioned those modules (at least most of them), so my questions
start:

a) on the (incomplete) ADSR i see 3 x IC's missing, only one the board
with LF356J. Board is labeled EML ADSR 9-76. 3 Pots 1 MEG Ohm, 1 Pot
5KOhms. Do we have any schematics for those? And it's EML100/400 or 500? 
b) What is the power level for those modules ? 12V ? 15V ? 9V ?
c) The VCO PCB is labeled EML VCO 12-76
d) On the NOISE PCB there are 2 IC's missing. Board is labeled EML 05
8-77. Schematics ?
e) The VCA's are labeled EML400-6 2/77. Fully equipped. I assume this
is a EML400 board ... any Schematics ?

Any help appreciated.

--jan

Hi Jan I will digg in my collection later this week. I got a few eml schematics here. And i got 5 eml boards witch is a long going project. Regards, Dennis ...

> a) on the (incomplete) ADSR i see 3 x IC's missing, only one the board
> with LF356J. Board is labeled EML ADSR 9-76. 3 Pots 1 MEG Ohm, 1 Pot
> 5KOhms. Do we have any schematics for those? And it's EML100/400 or 500? 

I don't think the 400 ones are full ADSR, so won't be that...

> e) The VCA's are labeled EML400-6 2/77. Fully equipped. I assume this
> is a EML400 board ... any Schematics ?

In files section, under literature and schematics.  Slightly cropped
and an earleir version, but should be close enough...

Any decent photos?

Steve