Analogue-sequencer

Hi Guys,

I'm a happy bunny today :->)

Believe it or don't. The solution to my sysex woes, i.e. not being able 
to reflash my P3 was all down to the opto -isolator on the midi input 
of the P3 board. 

I had the specified 6N139 device originally, and even though I could 
pass midi data quite happily using mthru on the P3, it was giving me 
problems with loading large blocks of data.

On a hunch, I thought I'd replace the opto, with a pin compatible 
device, HCPL-4701, which has a higher current transfer ratio (600% 
compared to 400%).

B*gger me, it worked first time. Just to check, I popped the 6N139 
back in, and it was still not playing the game, so I took it out, 
dropped it on the floor and squashed it.

So problem solved, I'm now running with V3.79. Thanks for the 
advice that Colin and Paul offered, especially thanks to Colin for 
inspecting my dump.....

(Call me Juvenile, but......:->)

Now to get that case back from Steve Thomas.

Cheers all

Andy
--
Andy Wilson
http://www.techman.synth.net
mailto:andy@techman.synth.net

> I had the specified 6N139 device originally, and even though I could 
> pass midi data quite happily using mthru on the P3, it was giving me 
> problems with loading large blocks of data.
> 
> On a hunch, I thought I'd replace the opto, with a pin compatible 
> device, HCPL-4701, which has a higher current transfer ratio (600% 
> compared to 400%).
> 
> B*gger me, it worked first time. Just to check, I popped the 6N139 
> back in, and it was still not playing the game, so I took it out, 
> dropped it on the floor and squashed it.

That's really bizarre. I've never had a problem with the 6N139, so I
guess there may have been some damage to the one you were using (static
?).
It'd be interesting if you get a chance to try another 139 and see if it
works OK.
Why the part would work OK for bursts of data like note messages and
short sysex blocks, but stop working during a large continuous block I
can only guess - maybe some stray capacitance at work...

Anyway, glad to hear you got it fixed !

Cheers,
Colin f

> It'd be interesting if you get a chance to try another 139 and see if 
it
> works OK.

Dropped in another 139 this morning, and it works fine! Must have 
just had a duff specimen. 

So, as you were everybody. Still if anyone else has similar problems, 
at least they'll know where to start looking.

Even though mine is still lashed up on the workbench, I'm having 
great fun with it. Realy cool piece of kit, Colin - Thanks

BTW, I've stuck some preliminary photos of my P3 here

http://www.techman.synth.net/techman_website2_000033.htm

Cheers

Andy
--
Andy Wilson
http://www.techman.synth.net
mailto:andy@techman.synth.net

Hi Andy

Looks very cool, a little minimalist maybe, but still cool :)

So, what housing you going to use?

I really wish I had the time to build a P3 but don't get enough time to write music, let alone build cool sequencers..

oh well,

Paul
London

  ----- Original Message ----- 
  From: Andy Wilson 
  To: analogue-sequencer@yahoogroups.com 
  Sent: 05 October 2003 13:02
  Subject: RE: [analogue-sequencer] P3 and Sysex problems, an update


  > It'd be interesting if you get a chance to try another 139 and see if 
  it
  > works OK.

  Dropped in another 139 this morning, and it works fine! Must have 
  just had a duff specimen. 

  So, as you were everybody. Still if anyone else has similar problems, 
  at least they'll know where to start looking.

  Even though mine is still lashed up on the workbench, I'm having 
  great fun with it. Realy cool piece of kit, Colin - Thanks

  BTW, I've stuck some preliminary photos of my P3 here

  http://www.techman.synth.net/techman_website2_000033.htm

  Cheers

  Andy
  --
  Andy Wilson
  http://www.techman.synth.net
  mailto:andy@techman.synth.net

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[Non-text portions of this message have been removed]

Hi Paul,

> Looks very cool, a little minimalist maybe, but still cool :)

Probably not 'gig ready' ;->)
> 
> So, what housing you going to use?

See Paul Maddox's enclosure here. It uses a case with walnut end 
cheeks, from Hammond. CNC engraving by Steve Thomas.

http://www.modulus.synth.net/pics/p3_assembled.jpg
> 
> I really wish I had the time to build a P3 but don't get enough time 
to write music, let alone build cool sequencers..

The most time consuming bit is probably finding and ordering the 
components. Construction doesn't really take that long. I think Mr 
Maddox did it in an evening!!

All the best

Andy
--
Andy Wilson
http://www.techman.synth.net
mailto:andy@techman.synth.net

Andy,

> See Paul Maddox's enclosure here. It uses a case with walnut end
> cheeks, from Hammond. CNC engraving by Steve Thomas.

kewl cases those.

> The most time consuming bit is probably finding and ordering the
> components. Construction doesn't really take that long. I think Mr
> Maddox did it in an evening!!

three evenings :-)
Evening 1) assemble PCBs
Evening 2) Adjust the case to make all the holes fit properly (Dont panic, I
emailed steve the corrections)
Evening 3) Mount it all inside the case and play.

A grand total of around 12 hours, no more..

Paul
---------------------------------------------------------------
Modulus Synth page ;-
   Http://www.Modulus.synth.net/
PPG webpages
   Http://www.PPG.synth.net/

On 5 Oct 2003 at 18:30, Paul Maddox wrote:

> > The most time consuming bit is probably finding and ordering 
the
> > components. Construction doesn't really take that long. I think 
Mr
> > Maddox did it in an evening!!
> 
> three evenings :-)

Slacker :->)

> Evening 2) Adjust the case to make all the holes fit properly (Dont 
panic, I
> emailed steve the corrections)

I'm looking forward to seeing if it all fits. I'll post some more photos 
when it's done.

Now I've seen those PLED displays.....hmmmm I want one.

Cheers

Andy
--
Andy Wilson
http://www.techman.synth.net
mailto:andy@techman.synth.net