Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Instruments and Amps Everything that makes music, Especially including instrument amps.

Roland Space Echo
Roland Space Echo
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
Thread Tools Search this Thread
Old 18th September 2008, 03:01 PM   #1
samoth is offline samoth  Europe
diyAudio Member
Join Date: Feb 2006
Location: HD
Default Roland Space Echo

Hi all,

does by any chance anyone know about the oscillator circuit of the space echo (RE-x01)? I'm particular interested in the transformer. Meaning what are the specs of such a tranformer and are there possible substitutes or humble diy approaches?

  Reply With Quote
Old 27th September 2008, 08:36 PM   #2
messager is offline messager  Europe
diyAudio Member
Join Date: Mar 2005
Location: europe
i think you will find out in the service manual

RE201 service manual
  Reply With Quote
Old 1st October 2008, 12:36 AM   #3
unclejed613 is offline unclejed613  United States
diyAudio Member
unclejed613's Avatar
Join Date: Dec 2006
i suppose you're talking about the bias oscillator. bias oscillators are usually ultrasonic (this one is 60khz, but i have seen them as high as 300khz before) and a pretty high voltage output (about 250V p-p being typical) but a very low current (under 1ma) the primary is usually wound for 12V ct (12V center tapped, meaning that the voltage across 1/2 the primary will be 12V) so the turns ratio will be between about 10:1 to 15:1. you coulf DIY one with a small toroid core and some 26GA or 28GA wire for the primary and 40GA wire for the secondary. you will need a couple of layers of insulating tape between the primary and secondary to provide the 500V of isolation needed to keep the secondary from arcing to the primary. teflon plumber's tape is pretty good for this, since teflon has one of the highest breakdown voltage-to-thickness ratios of any insulating material. before winding, put a couple of layers of teflon on the core as well. do not put the secondary down in layers unless you separate each layer with teflon. this keeps the secondary from arcing to itself.

to wind the windings, you should figure out how much wire you will need for each winding, and wind that amount plus about 20% on to a "shuttle". this will make winding a toroid much easier. also figure out how much room will be left through the center of the donut once all the wire is in place, and make the width of the shuttle just a little bit smaller than that. shown below is how the shuttle should be shaped. make it out of a stiff material so it doesn't deform once you begin winding wire on it. the longer the shuttle is, the more wire it will hold.
Attached Images
File Type: jpg toroidshuttle.jpg (9.0 KB, 56 views)
Vintage Audio and Pro-Audio repair ampz(removethis)@sohonet.net
spammer trap: spammers must die
  Reply With Quote


Roland Space EchoHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Looking for Roland KC-550 sechmatics ATech Instruments and Amps 1 19th May 2012 06:42 AM
Schematic for Roland PM-30 BrianDonegan Instruments and Amps 0 17th July 2008 08:50 PM
WTB: Roland M1000 tf1216 Swap Meet 0 30th November 2005 01:21 PM
echo in the box! deepanger Solid State 3 27th July 2003 08:57 PM
mod for roland 405 amp DanTheBluesMan Instruments and Amps 1 10th September 2002 07:39 AM

New To Site? Need Help?

All times are GMT. The time now is 08:53 PM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio