Boss - CE-1 Chorus Ensemble [schematic]
- sinner
- Old Solderhand
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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
- blackbunny
- Resistor Ronker
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.
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?
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?
- sinner
- Old Solderhand
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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)
- blackbunny
- Resistor Ronker
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.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)
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.
- sinner
- Old Solderhand
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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
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
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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
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...
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
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...
- sinner
- Old Solderhand
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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)
- blackbunny
- Resistor Ronker
Your replica files are looking good mate. Joyo or Moen will probably have a CE-1 clone on the market in about 3 months from now.
- sinner
- Old Solderhand
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blackbunny wrote:Your replica files are looking good mate. Joyo or Moen will probably have a CE-1 clone on the market in about 3 months from now.
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
- blackbunny
- Resistor Ronker
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, bbsinner 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
- sinner
- Old Solderhand
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Take your time, don't feel rushed
And remember to keep one hand in your pocket while munky around it
And remember to keep one hand in your pocket while munky around it
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- my favorite amplifier: Alembic F2-B pre / Fender TB600 head
- Completed builds: BYOC Armstrong Twin - built with switchable bass mod
1976 EHX Big Muff pi (op-amp) - true bypass mod
Reissue EHX BassBalls - external trimpot mod
Ibanez PM-7 - repaired broken switch
On the bench for mods: Crybaby, Danelectro FAB Echo - Location: Brisbane, Australia
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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
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
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- Posts: 12
- Joined: 30 Nov 2009, 00:48
- my favorite amplifier: Alembic F2-B pre / Fender TB600 head
- Completed builds: BYOC Armstrong Twin - built with switchable bass mod
1976 EHX Big Muff pi (op-amp) - true bypass mod
Reissue EHX BassBalls - external trimpot mod
Ibanez PM-7 - repaired broken switch
On the bench for mods: Crybaby, Danelectro FAB Echo - Location: Brisbane, Australia
- Been thanked: 1 time
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?
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?
- blackbunny
- Resistor Ronker
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?a ... &sort=code
It would be much easier than trying to modify the pedal to take an external power supply.
http://www.altronics.com.au/index.asp?a ... &sort=code
It would be much easier than trying to modify the pedal to take an external power supply.
- Attachments
-
- Altronics M2865L_18-0-18v.pdf
- Altronics 18-0-18v 150 mA transformer
- (23.49 KiB) Downloaded 181 times
- electrosonic
- Breadboard Brother
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.
Andrew.
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- my favorite amplifier: Alembic F2-B pre / Fender TB600 head
- Completed builds: BYOC Armstrong Twin - built with switchable bass mod
1976 EHX Big Muff pi (op-amp) - true bypass mod
Reissue EHX BassBalls - external trimpot mod
Ibanez PM-7 - repaired broken switch
On the bench for mods: Crybaby, Danelectro FAB Echo - Location: Brisbane, Australia
- Been thanked: 1 time
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
Again: awesome
cheers - Chris
- armdnrdy1
- Breadboard Brother
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
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
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.
I'll have to take a second glance.
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.
I'll have to take a second glance.