New Technics SP10 motor controller specification - Page 3 - diyAudio
Go Back   Home > Forums > Source & Line > Analogue Source

Analogue Source Turntables, Tonearms, Cartridges, Phono Stages, Tuners, Tape Recorders, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 19th June 2008, 05:33 PM   #21
Shaun is offline Shaun  South Africa
diyAudio Member
 
Shaun's Avatar
 
Join Date: Aug 2001
Location: Cape Town, South Africa
If the source code is available, it would not be a major task to port it over to another chip. One can make allowances for obsolescence by making the controller board separate from the PSU and drivers, etc. So one just needs to make a new controller board with the same electrical interfaces.

However, I've been pondering your idea of not reinventing the wheel (expressed in PM). One would have to replicate the main system blocks using currently available components, so the design effort required should be reduced.
__________________
Shaun Onverwacht
|||||||||| DON'T PANIC ||||||||||
  Reply With Quote
Old 19th June 2008, 06:46 PM   #22
diyAudio Member
 
Steerpike's Avatar
 
Join Date: Jan 2006
Location: Johannesburg, South Africa
How much of the original circuit have you 'reverse' engineered so far?
  Reply With Quote
Old 19th June 2008, 07:30 PM   #23
diyAudio Member
 
analog_sa's Avatar
 
Join Date: Aug 2002
Location: Sofia
Quote:
Originally posted by Steerpike
If the software (HEX dump) is free on the WWW, would most (all?) readers have some access to a PIC or EEPROM programmer?

Other than the terminally brain dead, yes. Putting together a programmer on a vero board takes five minutes.

It may be a better idea to publish assembler (or C) as well. It's pretty straightforward to recompile it for a different micro.
  Reply With Quote
Old 19th June 2008, 07:44 PM   #24
diyAudio Member
 
Zero Cool's Avatar
 
Join Date: Sep 2004
Location: MN
The SP-10's has some very good noise floor. So whatever controller you build will have to be very sophisticated to be as quiet. ramped pulses, feedback loop for stability etc.

The people that would have the most interest in something like this are archivist's that work with odd variety of disc's. The most important thing would be the pitch control. a very large +/- range would be helpful and it should be adjustable in semitones and cents not % which is about useless. Even if it read out in direct RPM would be better.

Variable speed from 10tpm to 100rpm would be desirable. backwards play at any speed. the ability to control start up and stop speeds. etc.

The controllers for these motors, for any of the technics direct drive motors are pretty well thought out. To duplicate one is no easy task! The hardest part is reducing cogging of the DD motor. the 10's had a -93dB noise floor if memory serves correct where as the 1200's and SP-25, SP-15's had something like -78db


best of luck. let us know how it goes!
  Reply With Quote
Old 19th June 2008, 08:18 PM   #25
diyAudio Member
 
Steerpike's Avatar
 
Join Date: Jan 2006
Location: Johannesburg, South Africa
Quote:
will have to be very sophisticated to be as quiet. ramped pulses,
Quote:
The hardest part is reducing cogging of the DD motor
The SP10 motor generates its own 3-phase sine drive signal, so there is no need to worry about waveforms, ramped or otherwise (if this is what you were referring to).
The motor and its original drive PCB act (electrically) just like an ordinary DC motor - increase the DC voltage and it runs faster / increases torque.
'Cogging' - well thats something that we iron out in the feedback compensator :-)

By 'noise' are you refering to 'noise' as an error/randomness in the speed setpoint?
  Reply With Quote
Old 20th June 2008, 09:37 AM   #26
diyAudio Member
 
Steerpike's Avatar
 
Join Date: Jan 2006
Location: Johannesburg, South Africa
I found this:
de.geocities.com/bc1a69/kaneta_eng.html
which has some interesting ideas.
  Reply With Quote
Old 21st June 2008, 05:47 PM   #27
rich121 is offline rich121  United States
diyAudio Member
 
Join Date: Nov 2007
Are yoiu reffering to the different (MKI, MKII and MKIII) diagrams, or the plinth?
As for the plinth, I would personally use Russian Baltic Birch for the "constrained layer" effect, as this has been my wish all along, to seperate the motor into the plinth.
After isolating the motor like this, it would be much easier to have a slab of slate cut for I believe, even a better plinth... more mass, with the "constrained layer" still there.
"Butcher block" syle plinths, isolation platforms etc. have been found from other sites/forums posters to not be a good design..but, I guess there is always experimentation..

Rick
  Reply With Quote
Old 21st June 2008, 10:37 PM   #28
diyAudio Member
 
Steerpike's Avatar
 
Join Date: Jan 2006
Location: Johannesburg, South Africa
I was interested in both - since I have no plinth either.
But his use of variable transconductance op-amps to control the motor speed was interesting. I'd avoid that though because I'd want to use very ordinary and easy to source components.
  Reply With Quote
Old 22nd June 2008, 11:17 PM   #29
rich121 is offline rich121  United States
diyAudio Member
 
Join Date: Nov 2007
Well, I hope that all goes well and that a controller/power supply can be designed to bring the SP-10 to it's full potential....
I am quite anxious to be honest..but, will be patient, as I would want the best design possible to be hashed out...

Keep us informed of any developments...

Rick
  Reply With Quote
Old 29th June 2008, 08:41 AM   #30
rich121 is offline rich121  United States
diyAudio Member
 
Join Date: Nov 2007
I hope this project takes hold and is not just another wishful undertaking.... I'm very serious about this...

Rick
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Technics SP10 haydn Analogue Source 10 27th October 2011 02:18 PM
Technics SP10 MKII/SH-10E Voltage Conversion? neiljadman Analogue Source 1 26th October 2009 08:45 AM
WTB: DC motor and controller g-horn Swap Meet 1 14th March 2008 04:14 AM
Servo motor controller? keantoken Everything Else 0 9th December 2006 07:49 AM
TEchnics SP10 MK II Turntable diyman Analogue Source 15 17th December 2001 02:28 PM


New To Site? Need Help?

All times are GMT. The time now is 04:37 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2