Technics Servo Drive Modifications - 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 20th May 2010, 05:20 AM   #1
diyAudio Member
 
antiquekid3's Avatar
 
Join Date: Feb 2010
Location: Alabama
Default Technics Servo Drive Modifications

Hey guys,

My physics teacher just traded me an SL-1400 for my SL-Q200. I figured the SL-1400 was an all around better turntable. I don't know if I'm going to regret this eventually or not...it seems to be a higher quality TT, and I like being able to vary the speeds. The SL-1400 seems to have more variety in cartridges.

However, looking at the schematic, I have found that it should be easy to modify the 45 rpm to play 78s. I would like to modify my turntable to keep the 33 rpm speed the same but have the 45 speed vary from ~40 to ~85 rpm. Is this possible? I'm hoping to use the existing pots.

Thanks!

Kyle
  Reply With Quote
Old 21st May 2010, 02:34 PM   #2
diyAudio Member
 
Join Date: Aug 2006
Not knowing the schematic, I'd guess that it is indeed possible to change the circtui to allow 45-85rpm adjustment.

However, I would also guess that the potentiometer would need to be a different value to increase the range of adjustment from +-10% (ish) to -0% +100%.

If the potentiometer is part of a potential divider including extra resistors it may be possible to alter the fixed resistors to give this bigger range, but you'd have to watch the current through the pot - and maybe the input voltage to comparators or similar.

This is the sort of change that needs careful design to be reliable really.
  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
Servo drive midrange? thadman Multi-Way 2 20th November 2006 12:45 AM
Technics direct drive SL-D35 Jason1976 Analogue Source 1 15th May 2006 06:28 AM
Servo Drive Sub woofer nbcaudio Subwoofers 2 22nd February 2005 04:22 PM
servo motor for turntable drive Mikewong Analogue Source 2 18th March 2004 08:51 AM
servo motor for turntable drive Mikewong Analogue Source 3 4th February 2004 09:57 AM


New To Site? Need Help?

All times are GMT. The time now is 05:12 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