Yamaha MR10

[expanoncolin]

All right, I've modified it enough, it's time to build a breakoutbox. One last thing : I'm trying to add a clock input, to be able to sync it with other gear (even midi). I've double checked all the IC pins without finding any clock signal.

3 possibilities :

1)  it is a digital signal with a high frequency so it appears to me like a continuous signal (i'm probing with a led)

2) the clock and all the patterns are generated by the big Voice IC (yamaha YM1023) wich would suck a lot because it would mean that syncing this box to an external clock is impossible...

3) I forgot something or I missed the clock when poking around the PCB


If you have any clue...

by the way : did you know that the main voici IC generate continuously 3 different sinusoidal tones (2 tones separated by 1 octave and the third is the fifth of the lowest tone) and 3 different colored noises.  This box could be a very very nice oscillator for a modular system (the noises sound excellent).

It is also possible to CV the pitch, but in a quite random way. (forget getting a DO,RE, MI, FA, SOL, LA, SI, DO with it)

Clocks are normally much too high to see with an LED...  normally at least in the kilohertz range.  You are going to want to probe with an oscilloscope.  You also need greater accuracy; if you find out the clock frequency is say, 1 Mhz, you are going to need to know exactly how much to multiply that 24 pulse per quarter note midi clock.

-Colin

[misterk]

oh, i'd like to trigger it with an audio-signal-metronome,
a short snare for example, that works with the mfb 501.
it's a bit tricky to find out the right volume, but it's ok.

concerning 70s drumcomputers, my technician said that there
were often flip-flops for the clock and that would make it easy
to install a sync-trigger-in.
is there something comparable in the mr 10?

i've got nothing to do with modifying and that stuff, so maybe my questions are stupid.
sorry,
gerrit

[expanoncolin]

oh, i'd like to trigger it with an audio-signal-metronome,
a short snare for example, that works with the mfb 501.
it's a bit tricky to find out the right volume, but it's ok.

concerning 70s drumcomputers, my technician said that there
were often flip-flops for the clock and that would make it easy
to install a sync-trigger-in.
is there something comparable in the mr 10?

i've got nothing to do with modifying and that stuff, so maybe my questions are stupid.
sorry,
gerrit

It really depends on the device, I haven't played with the MR-10.  But to find the clock and to find out what you need to send it you really should use an oscilloscope.  Or, if you are feeling really lucky, you could generate a clock with say a 4046, 4047 or a 555 even and just poke around the IC pins.  But you won't get MIDI sync that way.

-Colin

[misterk]

hello,
i'll put the schematics in the upload section.

2) the clock and all the patterns are generated by the big Voice IC (yamaha YM1023) wich would suck a lot because it would mean that syncing this box to an external clock is impossible...

[polyconnect]

is it up already ? I cannot find it in the schematic database.

[misterk]

http://experimentalistsanonymous.com/di ... R10_CD.pdf

any other idea than a trigger-in to sync it?

[polyconnect]

excellent !

that is great info !   too bad that the quality isn't that great

i'm reopening it tonight to see what I can do.
Colin you were right (again) about the high frequency clock.

I'll try to post as soon as I get something interesting.

BTW, I've been looking for that diagram for years. Where did you manage to find it ?

[misterk]

fine that i could help, maybe you can help
the millions loving the mr-10

BTW, I've been looking for that diagram for years. Where did you manage to find it ?

should i really reveal the last secret of human kind:)?

it's always the same procedure if i need manuals, schematics, infos...

1. ask the one who sold the item to you(in this case matthias from curetronic, maybe you know his modules...)
2. company contact, usa, uk, germany ...
3. threads in different forums
4. google if there are any sites concerning the gear and contact the author.
5. commercial sites(mark glinsky ...)

if you don't get answers, let's say, within two weeks,
you should forget it, that's my experience.

in this case yamaha germany helped.

[polyconnect]

Hmmm...

I suppose I must provide a 470kHz clock in the master clock in on the YM1002 IC...

But how can someone multiply 24ppn clock into a 470khz signal  

[expanoncolin]

Hmmm...

I suppose I must provide a 470kHz clock in the master clock in on the YM1002 IC...

But how can someone multiply 24ppn clock into a 470khz signal  

I imagine you aren't looking to create a static 470khz signal as that would not change the temp ever, you're looking to get a clock signal in that range.

You can make clock frequencies lower by using flip flops and counter chips.

You can make clock frequencies higher by using a phase locked loop with a flip flop or a counter chip in the feedback path. http://www.cardinalxtal.com/docs/notes/ ... basics.pdf

The problem I'd imagine you'd have is the relative change, but we can cross that bridge when we come to it.

-Colin

[polyconnect]

oh god, do I love internet...  

[discointellect]

Excellent stuff with the schematic! I'm going to have another go at my MR10 now (and probably pick up another one while I'm at it), so thanks. If I find any interesting hacks I'll post them here.

[Aircoholic]

bringing this thread back to live... I just scored an MR10 very cheap and am now looking for mods, before I start circuit bending it on my own...
unfortunately the Link for the Schematic is down, does somebody still have it and can send it to me?

[Aircoholic]

Doesn't anybody have the Schematic?

I already contacted Yamaha and Misterk, who posted a Link to the schematic in the upload section which is dead, without any success.

[e-was]

hi all,

i'm completly new to this forum...

i urgently need schematics for the yamaha MR10 preset drumcomputer.
the links on this site are all dead.

can anyone please, please up them again or send a d/l link?


thank you very much!!!!


regards.

roman