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RMI Harmonic Synthesizer schematics


Post Posted Thu May 07, 2009 5:20 pm
ZooTooK


Posts: 19

I have a vague recollection of somebody (Radek?) had the schematics or service manual of the RMI Harmonic Synthesizer.

I'd very much get a copy of those if possible.

More precisely I'm trying to understand how the digital oscillators are designed. I've understood that they are made of 7497 binary counters sent through a resistor grid. Now the 7497 is a 6 bit counter - BUT are all bits used? To my very unscientific ears 64 steps sounds smoother than what you hear on Oxygene... I'm guessing more like 3 or 4 bits.

It's also hinted to in this forum post by David Hillel Wilson:


http://www.nabble.com/RMI-Harmonic-Synthesizer-td10804516.html
Post Posted Thu May 07, 2009 6:48 pm
radek tymecki


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i'll post em today then
Post Posted Thu May 07, 2009 8:03 pm
ZooTooK


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:lol:

zootook at telia do t com
Post Posted Mon May 25, 2009 1:46 pm
ZooTooK


Posts: 19

Radek

if you replied via email I've lost it in the recent flood of spam. Could you re-send please?!
Post Posted Mon May 25, 2009 2:53 pm
radek tymecki


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sure man! catch

http://www.sendspace.com/file/brpn8d

if you'll try to recreate pcb's lemme know :D
Post Posted Tue May 26, 2009 10:21 am
ZooTooK


Posts: 19

Big thanks Radek!

No, I'm not going to make any circuit boards....
Post Posted Tue May 26, 2009 10:56 am
Analog-Umph


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LOL at Page 10, Example 1. Now we know where the O5 bassline came from. :lol:


The RMI HS truly was indispensable to the creation of the album.
Without faith nothing is possible. With it, nothing is impossible.
Post Posted Wed Jul 01, 2009 2:45 pm
Analog-Umph


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Radek did you manage to get a photo of JMJ's RMI HS side control panel? There's some modifications to the original design that interest me.
Without faith nothing is possible. With it, nothing is impossible.
Post Posted Wed Jul 01, 2009 3:26 pm
GeeJee
The GUV'NOR

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He had the filter modded if I remember correctly?
:mrgreen:
Post Posted Thu Jul 02, 2009 6:01 am
Analog-Umph


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The top row of knobs is smaller than the standard design. There's 3 extra knobs on his HS, and also what looks like a tiny set of led displays above the envelope knobs.
Without faith nothing is possible. With it, nothing is impossible.
Post Posted Thu Jul 02, 2009 11:48 am
radek tymecki


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there's mode switch and 4 knobs instead of 2-3 (attack-decay, decay).

the 4 knobs are used for left and right ADSR

here's some hi res shots

Image

Image
Post Posted Thu Jul 02, 2009 4:17 pm
Analog-Umph


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That's what I thought > proper envelopes.

Awesome thanks for the shots radek.

That knob between the first and second rows, what's that one for.
Without faith nothing is possible. With it, nothing is impossible.
Post Posted Thu Jul 02, 2009 5:10 pm
radek tymecki


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sequencer
Post Posted Thu Jul 02, 2009 7:07 pm
Analog-Umph


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I meant this one, 'cause that's the extra one:

Image
Without faith nothing is possible. With it, nothing is impossible.
Post Posted Thu Jul 02, 2009 7:27 pm
radek tymecki


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there's sticker over it but i cant read it... RAT... rate ?

maybe it's tremolo rate or sth







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