BlahBlahCafe - Jean-Michel Jarre forum

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

i'll post em today then

zootook at telia do t com

Radek

if you replied via email I've lost it in the recent flood of spam. Could you re-send please?!

sure man! catch

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

if you'll try to recreate pcb's lemme know

Big thanks Radek!

No, I'm not going to make any circuit boards....

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


The RMI HS truly was indispensable to the creation of the album.

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.

He had the filter modded if I remember correctly?

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.

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

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.

sequencer

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

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

maybe it's tremolo rate or sth