Boss - CE-1 Chorus Ensemble  [schematic]

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

Even the box by itself is absolutely stunning. Here and here are some gut shots.
more pics for free (not at $750 :shock: )

enjoy!

all pics archived
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blanik
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Post by blanik »

i think i used to own this unit (the one being sold) for more than 10 years, i never used the chorus, i used it for tremolo and sold it for 250$CAN 6 years ago in Montreal... i'll have to check my old gear pics but the scratches on it seem pretty consistent with what i remember... :D

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pz
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Post by pz »

I've got one on my table now. Unfortunately, i've just finished modding it for better performance with guitar and modern pickup signal levels, so it is no longer in "true vintage" condition. But if you need some additional photos, details i can provide them.

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Rocket Roll
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Post by Rocket Roll »

That would be very educational, thanks in advance!

E.g. what about that transformer?

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pz
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Post by pz »

The power transformer has 2x18.5V AC secondaries (loaded), as it is written on the schematic. The overall measured differences in the voltages against the values on the schematic were about +/- 0.7V.
Here's some photos:
Attachments
ce1-pcb4.jpg
ce1-pcb3.jpg
ce1-pcb2.jpg
ce1-pcb1.jpg
ce1-1.jpg
Last edited by pz on 14 Oct 2008, 13:57, edited 1 time in total.

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pz
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Post by pz »

and more...
Attachments
ce1-xfr2.jpg
ce1-pcb6.jpg
ce1-pcb5.jpg

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borislavgajic
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Post by borislavgajic »

Nice ...thanks!!!

...but trace side is missing....so could you do it please?


boris

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pz
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Post by pz »

Tracks side, unfortunately already modded...
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ce1-pcb7.jpg

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analogguru
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Post by analogguru »

There´s a bad solder joint (in the top-middle) of the 100k near the MN3002.

analogguru
There´s a sucker born every minute - and too many of them end up in the bootweak pedal biz.

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pz
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Post by pz »

It isn't bad, it's simply no longer used.

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analogguru
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Post by analogguru »

aha....
There´s a sucker born every minute - and too many of them end up in the bootweak pedal biz.

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Fuzzer
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Post by Fuzzer »

It is wired to the small board now, right?
The Freestompboxes Forum search function is soo great, use the search function..., the S E A R C H function.

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pz
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Post by pz »

Yes, i've used an external trimpot to set the BBD bias voltage.

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daz
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Post by daz »

i've got a copy of the schematic and board layout guide roland gave me, I'll see if I can scan it sometime..

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analogguru
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Post by analogguru »

There´s a sucker born every minute - and too many of them end up in the bootweak pedal biz.

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Post by sinner »

I can't believe, there is no tread about this classic on the board :scratch: Perhaps my searching is wrong :roll:

Anyway, a have little thing attached to the post, but resolution of this is discussable, maybe some of you have something better?

Cheers
Pawel

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JJ Gabor
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Post by JJ Gabor »

I am interested in a project for this one.

Here are a couple of factory schematics and images i found with google. Got no way of verifying if they are correct.
BossCE-1v1.gif
BossCE-1v2.gif
And a pic of the board
boss_ce1_05.jpg

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pf_fan
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Post by pf_fan »

Two more from me :)
Attachments
CE1PCBFront.JPG
CE1PCBback.JPG

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JJ Gabor
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Post by JJ Gabor »

Trackside!

Score :horsey:

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borislavgajic
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Completed builds: ...script phase90,ETI phaser,Ross phaser,mutronC200,vox wah,WH10,FW-3,mutronIII,DrQuack,Penfoldautowah,Tubezipper,
Dipthonizer,seekwah,Talkingpedal,morleywha
...soulpreacher,dynacomp,compulator
...buzzaround,fuzzfactory,screwdriver,sho,superdouper,St-9,RogerMayer octavia,Tychobrahe octavia,paralelluniverse,string damper,slowgear
...CE-2,ibanez fL301,EH theCloneTheory
EHX bassmicrosynth,EHX EnglishMuffin,Tube Phaser,springtubereverb ,greyDOD,FulldriveII mosfet,OCD,VOX repeat percussion,RingStinger,Meatball,12stage phaser....
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Post by borislavgajic »

pf_fan...this is music for my eyes!

many thanks :applause:
boris

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