Boss - CE-1 Chorus Ensemble  [schematic]

All about modern commercial stompbox circuits from Electro Harmonix over MXR, Boss and Ibanez into the nineties.

Re: Boss - CE-1 ( Chorus Ensemble )

Postby sinner » 26 May 2013, 09:43

No biggy ;-) actually im happy that i don't have to start all over B-) these files took my hell of a time to develope. There was no other replica that too that much of time to investigate. The sad part is I still know nothing about issue order or how many of revisions/versions was back then
sinner
Old Solderhand
 
Posts: 4811
Joined: 06 Nov 2008, 18:16
Location: ...no more
Has thanked: 1239 times
Have thanks: 1098 times

Re: Boss - CE-1 ( Chorus Ensemble )

Postby blackbunny » 26 May 2013, 10:25

:secret: Actually, I found an "official" Boss CE-1 v2 schematic, and yours is identical, at least I haven't found any differences between them so far. :applause:

The output diode pairs are drawn as zeners, so I tested them and they are 15v zeners back to back. Static electricity protection for the JFETs buffering the L & R outputs, maybe?
User avatar
blackbunny
Resistor Ronker
 
Posts: 375
Joined: 07 Jan 2011, 08:41
Location: the garage
Has thanked: 232 times
Have thanks: 109 times

Re: Boss - CE-1 ( Chorus Ensemble )

Postby sinner » 26 May 2013, 11:20

im not sure actually what version was first. The one called v1 have no dides, nor that output resistors, and les parts around IC3 (input buffer? Boost section? I canit remember, i have no my pc with me today)
sinner
Old Solderhand
 
Posts: 4811
Joined: 06 Nov 2008, 18:16
Location: ...no more
Has thanked: 1239 times
Have thanks: 1098 times

Re: Boss - CE-1 ( Chorus Ensemble )

Postby blackbunny » 27 May 2013, 07:15

sinner wrote:im not sure actually what version was first. The one called v1 have no dides, nor that output resistors, and les parts around IC3 (input buffer? Boost section? I canit remember, i have no my pc with me today)

Yes, no diodes or 470r series resistors, also different op amp types for input IC1 and IC3. First version has TA7504S and 2nd version has TA7136P op amps, which have extra resistors and capacitors for frequency compensation.

Here is the corrected image for the output diode locations, with board solder lug 1 as input, lug 5 as Left / mono out and lug 6 as Right output.
You do not have the required permissions to view the files attached to this post.
User avatar
blackbunny
Resistor Ronker
 
Posts: 375
Joined: 07 Jan 2011, 08:41
Location: the garage
Has thanked: 232 times
Have thanks: 109 times

Re: Boss - CE-1 ( Chorus Ensemble )

Postby sinner » 27 May 2013, 13:20

Cheers mate

Heres picture of so called v.1 schematic example ce1 board

Look at the space around ic3 - one resistor and two caps less, just empty spaces around of it. Thats why I think its later version really. It would be strange to create pads in early unit and not use it at all. Its just a theory, but quite logic
sinner
Old Solderhand
 
Posts: 4811
Joined: 06 Nov 2008, 18:16
Location: ...no more
Has thanked: 1239 times
Have thanks: 1098 times

Re: Boss - CE-1 ( Chorus Ensemble )

Postby sinner » 27 May 2013, 14:24

Dudes,

First of all, forgive me my spelling - I'm having new job, and I do massive hours recently - I can barely speak my native language :oops:

Anyway...

I decided to upload my replica files. It's early beta version (layout, and updated schematic corresponded to the one posted earlier). Far away from final version I'm going to make - lots of things undone (wiring, add-on diodes, only ones checked values and part numbers), but fine enough to make the conversation easier.

I wont post the final data before I get all needed parts (BBD, and clock, opamps, IC's), even if I get it done as I assumed

Hope it helps to drive the conversation to higher level anyway :)

BTW, the picture I showed in previous post shows more parts dropped off - look at the area around of IC1...

For this message the author sinner has received thanks: 2
blackbunny (27 May 2013, 15:43), Fender3D (27 May 2013, 14:51)
sinner
Old Solderhand
 
Posts: 4811
Joined: 06 Nov 2008, 18:16
Location: ...no more
Has thanked: 1239 times
Have thanks: 1098 times

Re: Boss - CE-1 ( Chorus Ensemble )

Postby sinner » 27 May 2013, 14:27

The colored pads and traces are the visual voltage dissipation - gray is ground, the rest of colors are explained at the schemo attached (look at the PS part)
sinner
Old Solderhand
 
Posts: 4811
Joined: 06 Nov 2008, 18:16
Location: ...no more
Has thanked: 1239 times
Have thanks: 1098 times

Re: Boss - CE-1 ( Chorus Ensemble )

Postby blackbunny » 27 May 2013, 15:46

Your replica files are looking good mate. :applause: :applause: :applause: Joyo or Moen will probably have a CE-1 clone on the market in about 3 months from now. :blackeye
User avatar
blackbunny
Resistor Ronker
 
Posts: 375
Joined: 07 Jan 2011, 08:41
Location: the garage
Has thanked: 232 times
Have thanks: 109 times

Re: Boss - CE-1 ( Chorus Ensemble )

Postby sinner » 27 May 2013, 15:51

blackbunny wrote:Your replica files are looking good mate. :applause: :applause: :applause: Joyo or Moen will probably have a CE-1 clone on the market in about 3 months from now. :blackeye



I would prefer to see dual 512-stage cloned BBD's from coolaudio instead ;)

Blackbunny, could you take IC, and Q's voltages in spare time? It would be nice to have them from actual unit as a future service/troubleshooting data. As well as transformer secondaries reading pre and post rectifier diodes
sinner
Old Solderhand
 
Posts: 4811
Joined: 06 Nov 2008, 18:16
Location: ...no more
Has thanked: 1239 times
Have thanks: 1098 times

Re: Boss - CE-1 ( Chorus Ensemble )

Postby blackbunny » 27 May 2013, 16:04

sinner wrote:Blackbunny, could you take IC, and Q's voltages in spare time? It would be nice to have them from actual unit as a future service/troubleshooting data. As well as transformer secondaries reading pre and post rectifier diodes

OK, no problem. We're having a few late night beers over here before bedtime. Will measure voltages tomorrow morning Aussie time...very carefully, probably feeling a bit shabby. Cheers, bb
User avatar
blackbunny
Resistor Ronker
 
Posts: 375
Joined: 07 Jan 2011, 08:41
Location: the garage
Has thanked: 232 times
Have thanks: 109 times

Re: Boss - CE-1 ( Chorus Ensemble )

Postby sinner » 27 May 2013, 16:13

Take your time, don't feel rushed

And remember to keep one hand in your pocket while munky around it ;-)
sinner
Old Solderhand
 
Posts: 4811
Joined: 06 Nov 2008, 18:16
Location: ...no more
Has thanked: 1239 times
Have thanks: 1098 times

Re: Boss - CE-1 ( Chorus Ensemble )

Postby Rude_Mechanical » 03 Aug 2013, 02:08

Hey guys, picked one of these up the other day relatively cheaply (it's a US power model bought here in Australia). Looking to get rid of the external 240v-110v step-down transformer that it came with; does anybody know if the original transformer primary has a 240v tap (or near enough to do the job?). There's a blue lead on the primary that is capped and NC to anything. I'm REALLY hoping that's a 240v tap. Failing that, as I see it I have two options:

1) Replace the transformer for one with a 240v primary and +/- 18V secondaries.
2) Remove the transformer entirely and rewire a Boss-style jack to take an 18V AC adaptor.

I've done the latter for a Tubeworks Blue Tube, as there was no way I could find a 240v transformer that was going to fit in the case. That worked a treat, but the Blue Tube doesn't have a centre-tapped secondary, so I'm guessing that puts paid to that idea in this case.

Any help much appreciated, chaps.

Chris
Rude_Mechanical
 
Posts: 12
Joined: 30 Nov 2009, 01:48
Location: Brisbane, Australia
Has thanked: 0 time
Have thanks: 1 time

Re: Boss - CE-1 ( Chorus Ensemble )

Postby Rude_Mechanical » 03 Aug 2013, 02:12

Bugger: I just answered part of my own question. The DM-1 bill of parts can be found here: http://www.synfo.nl/servicemanuals/Boss ... _NOTES.pdf

You'll note it has the same transformer, which is clearly marked as 100/117 V. On the plus side, I have a part number for the 240V version now.

So, while I'm tracking down an appropriate part, any suggestions for modding this to take an AC adaptor?
Rude_Mechanical
 
Posts: 12
Joined: 30 Nov 2009, 01:48
Location: Brisbane, Australia
Has thanked: 0 time
Have thanks: 1 time

Re: Boss - CE-1 ( Chorus Ensemble )

Postby blackbunny » 06 Aug 2013, 01:53

You could measure up the existing transformer for size to see if there's enough space to fit an Altronics M2865L, which is available from their online store in Perth, W.A.

http://www.altronics.com.au/index.asp?area=prod&grp=88&list=0&pg=1&sort=code

It would be much easier than trying to modify the pedal to take an external power supply.
You do not have the required permissions to view the files attached to this post.
User avatar
blackbunny
Resistor Ronker
 
Posts: 375
Joined: 07 Jan 2011, 08:41
Location: the garage
Has thanked: 232 times
Have thanks: 109 times

Re: Boss - CE-1 ( Chorus Ensemble )

Postby electrosonic » 06 Aug 2013, 02:22

I got my CE-1 for cheap in a pawnshop years ago. The plug and transformer were the European style for 240 volts. (It was also painted black for some reason). I switch out the transformer and plug for use in North America. I think I used a Hammond transformer, I can check to see which one if anyone cares.

Andrew.
User avatar
electrosonic
Breadboard Brother
 
Posts: 124
Joined: 28 Nov 2008, 17:53
Location: Vancouver, BC
Has thanked: 27 times
Have thanks: 19 times

Re: Boss - CE-1 ( Chorus Ensemble )

Postby Rude_Mechanical » 09 Aug 2013, 01:13

Great work, blackbunny! The part you listed is about 4mm longer and 10mm wider - it will be a tight fit, but it _will_ fit. I think I even looked at that, but was put off by the incorrect product image.

Again: awesome :)

cheers - Chris

For this message the author Rude_Mechanical has received thanks:
blackbunny (09 Aug 2013, 14:33)
Rude_Mechanical
 
Posts: 12
Joined: 30 Nov 2009, 01:48
Location: Brisbane, Australia
Has thanked: 0 time
Have thanks: 1 time

Re: Boss - CE-1 ( Chorus Ensemble )

Postby armdnrdy1 » 09 Aug 2013, 15:09

I would retrofit the power section to incorporate a 18vac wall adapter.

http://www.jameco.com/webapp/wcs/stores ... QgodjkcAaQ

With the proper filtering, an adequate bipolar supply can be designed from a half wave rectified, non center tapped AC source.


http://www.musicfromouterspace.com/anal ... SUPPLY.php
armdnrdy1
Breadboard Brother
 
Posts: 104
Joined: 07 Oct 2012, 01:11
Has thanked: 14 times
Have thanks: 66 times

Re: Boss - CE-1 ( Chorus Ensemble )

Postby Fender3D » 09 Aug 2013, 16:48

This may be easier (9VAC wall adapter)...

PwrSpply.pdf



BTW
Larry:
did you loose your password? :slap:
You do not have the required permissions to view the files attached to this post.
User avatar
Fender3D
Cap Cooler
 
Posts: 481
Joined: 08 Aug 2009, 03:40
Location: Helltaly
Has thanked: 94 times
Have thanks: 122 times

Re: Boss - CE-1 ( Chorus Ensemble )

Postby armdnrdy1 » 09 Aug 2013, 17:37

Yes Federico,
I "lost" my password about a year ago! I couldn't log in so I had to re-register under armdnrdy1.
This circuit is originally powered with bipolar 13 & 14 volts but the 13 volts is only used at the input IC1 and Q1.

Retro-sonics version is powered by 9VDC and at first glance, I really don't see a charge pump. :hmmm:

I'll have to take a second glance.
armdnrdy1
Breadboard Brother
 
Posts: 104
Joined: 07 Oct 2012, 01:11
Has thanked: 14 times
Have thanks: 66 times

Re: Boss - CE-1 ( Chorus Ensemble )

Postby armdnrdy1 » 09 Aug 2013, 17:42

Upon second glance,

I see a rectifier in one gut shot and a DC/DC converter in another.
armdnrdy1
Breadboard Brother
 
Posts: 104
Joined: 07 Oct 2012, 01:11
Has thanked: 14 times
Have thanks: 66 times

PreviousNext

Return to Modern Stompbox Effects (1975 - ...)

Who is online

Users browsing this forum: snofla1900, Yahoo [Bot] and 9 guests