Buchla 200X serie 208X build thread

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Re: Buchla 200X serie 208X build thread

Post by boops » Wed Mar 24, 2021 3:54 am

Radiance2021 wrote:
Sun Mar 21, 2021 4:49 pm
Thanks for the detailed build instructions...looking good!


Thanks ,there are importantes updates in the first post.
208X 200X modules serie ,Buchla 200 upgraded viewtopic.php?f=17&t=243688&p=3444875#p3444875
FS :custom buchla 203 style càbinet ,skiff new design,boat ,hardware for diy cabinet ,easel case ,new 1u to 10u to 56u and more. / New 208 buchla card 12 price down atm/
HQ small case buchla psu PCB
viewtopic.php?p=3118393#3118393
viewtopic.php?t=211862&highlight=

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Re: Buchla 200X serie 208X build thread

Post by boops » Wed Mar 24, 2021 4:11 am

I ve built the new card 1,and a complete MB and panel pcb ,everything is fine,a few diy things to do ,here :

On the psu the 12V IN+/IN- infos are backward,solder your +12 V from the external ,thru the dc 12v dc jack to the RED SQUARE
Pics
E8EA30FE-8129-4781-8293-7B487166CB01.jpeg
1CE6CDD3-8DDF-4698-8022-9D029CC445D2.jpeg
E8D5999F-E380-4B92-ACF0-15866C63C4A6.jpeg
You will need 4 feet.
2F7CEDD9-26D9-46AF-8D6A-98DED45417E3.jpeg
D922A1C4-B54A-40A2-9A2B-76914BAEBEAC.jpeg

You need to take off the paint in the 12v lamp hole to have the ground on the plug,then only the 12V hot wire to solder .
D0DBED5B-585E-4216-AFF5-AF362A6A0333.jpeg
19093114-B58D-49BE-9757-A36E8580D049.jpeg
Last edited by boops on Wed Mar 24, 2021 3:19 pm, edited 4 times in total.
208X 200X modules serie ,Buchla 200 upgraded viewtopic.php?f=17&t=243688&p=3444875#p3444875
FS :custom buchla 203 style càbinet ,skiff new design,boat ,hardware for diy cabinet ,easel case ,new 1u to 10u to 56u and more. / New 208 buchla card 12 price down atm/
HQ small case buchla psu PCB
viewtopic.php?p=3118393#3118393
viewtopic.php?t=211862&highlight=

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Re: Buchla 200X serie 208X build thread

Post by boops » Wed Mar 24, 2021 4:13 am

Install a wire for the post reverb connection ,here in yellow
CB106C17-FF77-46F7-94AE-B9A569AEC585.jpeg
2 red wires ,out of the vactrol in the reverb level mix cv circuit are wired to the 2 pots
F4DC4F2A-AD62-4421-B9A2-811B6F0EB5BA.jpeg
Step 2 mod,here I use a 270k ,select on test to have the step 3 ,a 100k for the step 2
Follow the red ,blue ,green wires positions from the toggle step 2
FF6A7069-289F-471E-B0AD-AB2C4A4C90E8.jpeg
393C2439-C142-4C5F-9B3F-C363CBCFE940.jpeg
ACB3B6C8-01F7-4709-8AB1-8BB9DABDB595.jpeg
Last edited by boops on Wed Mar 24, 2021 4:32 pm, edited 4 times in total.
208X 200X modules serie ,Buchla 200 upgraded viewtopic.php?f=17&t=243688&p=3444875#p3444875
FS :custom buchla 203 style càbinet ,skiff new design,boat ,hardware for diy cabinet ,easel case ,new 1u to 10u to 56u and more. / New 208 buchla card 12 price down atm/
HQ small case buchla psu PCB
viewtopic.php?p=3118393#3118393
viewtopic.php?t=211862&highlight=

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Re: Buchla 200X serie 208X build thread

Post by boops » Wed Mar 24, 2021 9:02 am

New card 1 reset seq
0701F67C-3AA6-47B7-93B5-F607E44746E0.jpeg



Connection between the aux/noise pcb and the mother board MB
And the 10 pins standard Buchla power connector
Q -quiet Ground pin1 =black
-15v pin2 =blue (standard Buchla code is white)
+15v pin3 =red
+12v pin4 =green
+5v pin5 =yellow
N -noise ground pin6 =brown
Pin7 put a blob of solder


970C2F60-C013-4EA3-B431-83DE23DDAD80.jpeg
The reverb Tank connections molex 2 pins
Attachments
0C03E32A-E1F3-4BFC-BEA7-AB6B2ADDC16E.jpeg
208X 200X modules serie ,Buchla 200 upgraded viewtopic.php?f=17&t=243688&p=3444875#p3444875
FS :custom buchla 203 style càbinet ,skiff new design,boat ,hardware for diy cabinet ,easel case ,new 1u to 10u to 56u and more. / New 208 buchla card 12 price down atm/
HQ small case buchla psu PCB
viewtopic.php?p=3118393#3118393
viewtopic.php?t=211862&highlight=

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Re: Buchla 200X serie 208X build thread

Post by Radiance2021 » Sat Mar 27, 2021 9:53 am

Today I've received my kit! The pcb's, panel and casing all look very nice! Also, everything was very well packed...
Now all I need is some peace and quiet to tackle this project :-)

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Re: Buchla 200X serie 208X build thread

Post by Radiance2021 » Sun Mar 28, 2021 4:46 am

Is there a schematic from the 208X version, a schematic that includes all the X modifications?
Sorry if I missed something but I could not find info on this.

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Re: Buchla 200X serie 208X build thread

Post by boops » Sun Mar 28, 2021 11:58 am

Radiance2021 wrote:
Sun Mar 28, 2021 4:46 am
Is there a schematic from the 208X version, a schematic that includes all the X modifications?
Sorry if I missed something but I could not find info on this.
You have to use the original 208 schematics ,I can share some infos about the X mods ,parts of schematic if needed,but some are privates designs. Atm.
Original Schematics /builds infos in this excellent site by example

https://www.dsl-man.de/display/DSO/Buchla+208+Clone
208X 200X modules serie ,Buchla 200 upgraded viewtopic.php?f=17&t=243688&p=3444875#p3444875
FS :custom buchla 203 style càbinet ,skiff new design,boat ,hardware for diy cabinet ,easel case ,new 1u to 10u to 56u and more. / New 208 buchla card 12 price down atm/
HQ small case buchla psu PCB
viewtopic.php?p=3118393#3118393
viewtopic.php?t=211862&highlight=

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Re: Buchla 200X serie 208X build thread

Post by Radiance2021 » Sun Mar 28, 2021 1:56 pm

Merci!

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Re: Buchla 200X serie 208X build thread

Post by boops » Mon Mar 29, 2021 3:54 am

A word about the tank reverb ,I use 2 springs reverb as the original ,the banzai description is wrong (3 springs)
RA 1BC2E
The reverb tank,BE CAREFUL THE COILS ARE REALLY FRAGILES,specially the output which has really thin wire
https://www.banzaimusic.com/accutronics-1bc2e.html

208X MB V4 mouser basket

https://www.mouser.com/ProjectManager/P ... 01fbe8f43b
29 03 21 ,I don’t why but I ve found the flashy leds,updated with the low light better leds.
https://www.mouser.fr/ProductDetail/859-LTL-4221
208X 200X modules serie ,Buchla 200 upgraded viewtopic.php?f=17&t=243688&p=3444875#p3444875
FS :custom buchla 203 style càbinet ,skiff new design,boat ,hardware for diy cabinet ,easel case ,new 1u to 10u to 56u and more. / New 208 buchla card 12 price down atm/
HQ small case buchla psu PCB
viewtopic.php?p=3118393#3118393
viewtopic.php?t=211862&highlight=

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Re: Buchla 200X serie 208X build thread

Post by DanaFo » Mon Mar 29, 2021 11:49 am

boops wrote:
Sun Mar 28, 2021 11:58 am
Radiance2021 wrote:
Sun Mar 28, 2021 4:46 am
Is there a schematic from the 208X version, a schematic that includes all the X modifications?
Sorry if I missed something but I could not find info on this.
You have to use the original 208 schematics ,I can share some infos about the X mods ,parts of schematic if needed,but some are privates designs. Atm.
Original Schematics /builds infos in this excellent site by example

https://www.dsl-man.de/display/DSO/Buchla+208+Clone
I'm confused, I bought this for the 208x build... are the build instructions for the 208x? You're just keeping the schematic private?

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Re: Buchla 200X serie 208X build thread

Post by Radiance2021 » Mon Mar 29, 2021 1:43 pm

What if I don't want the x mods?
Will the 208 just work "normal" if I just don't stuff the extra "x" parts? Or do I need to bypass certain connections with wire?
This was the reason I asked for the "x" mod schematic.
I'm not sure if I want ALL the mods, or maybe NONE...

Thing is, I can figure it all out by looking at the PCB, hell..I'll even draw my own "x"mod schematic given enough time LOL...

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Re: Buchla 200X serie 208X build thread

Post by Radiance2021 » Mon Mar 29, 2021 3:22 pm

Builders tip here; before you start stuffing the boards, make foto's from all pcb's. Once stuffed it's very hard to see the original markings (silkscreen) on the pcb...in case you want to know what went where....

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Re: Buchla 200X serie 208X build thread

Post by DanaFo » Mon Mar 29, 2021 6:17 pm

Radiance2021 wrote:
Mon Mar 29, 2021 3:22 pm
Builders tip here; before you start stuffing the boards, make foto's from all pcb's. Once stuffed it's very hard to see the original markings (silkscreen) on the pcb...in case you want to know what went where....
Excellent advice! :party:

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Re: Buchla 200X serie 208X build thread

Post by boops » Tue Mar 30, 2021 3:58 am

All the infos are for a 208X build
If you don’t install the mods ,you will have a classic 208 module,be careful some X parts on some daughter cards are upgrades and have to be installed (check the Dave brown modular synthesis web site) the loop ,retrig Ed env is a must have ,the reverb mix level cv too,imho
since I ve played the first 208X ,too much fun ,I don’t like my standard 208,I will sell it soon.

DanaFo wrote:
Mon Mar 29, 2021 11:49 am
boops wrote:
Sun Mar 28, 2021 11:58 am
Radiance2021 wrote:
Sun Mar 28, 2021 4:46 am
Is there a schematic from the 208X version, a schematic that includes all the X modifications?
Sorry if I missed something but I could not find info on this.
You have to use the original 208 schematics ,I can share some infos about the X mods ,parts of schematic if needed,but some are privates designs. Atm.
Original Schematics /builds infos in this excellent site by example

https://www.dsl-man.de/display/DSO/Buchla+208+Clone
I'm confused, I bought this for the 208x build... are the build instructions for the 208x? You're just keeping the schematic private?

Ive updated the first post,same cleaner boms

30 March 21 cleaner last boms USE THEM
208X 200X modules serie ,Buchla 200 upgraded viewtopic.php?f=17&t=243688&p=3444875#p3444875
FS :custom buchla 203 style càbinet ,skiff new design,boat ,hardware for diy cabinet ,easel case ,new 1u to 10u to 56u and more. / New 208 buchla card 12 price down atm/
HQ small case buchla psu PCB
viewtopic.php?p=3118393#3118393
viewtopic.php?t=211862&highlight=

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Re: Buchla 200X serie 208X build thread

Post by Radiance2021 » Tue Mar 30, 2021 10:08 am

boops wrote:
Tue Mar 30, 2021 3:58 am
All the infos are for a 208X build
If you don’t install the mods ,you will have a classic 208 module,be careful some X parts on some daughter cards are upgrades and have to be installed
Which X parts need to be installed?

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Re: Buchla 200X serie 208X build thread

Post by boops » Tue Mar 30, 2021 12:56 pm

Radiance2021 wrote:
Tue Mar 30, 2021 10:08 am
boops wrote:
Tue Mar 30, 2021 3:58 am
All the infos are for a 208X build
If you don’t install the mods ,you will have a classic 208 module,be careful some X parts on some daughter cards are some upgrades and have to be installed
Which X parts need to be installed?
Card 1 C9x to C14x
Card 3/card4 /Card 5 /card 6 /card 9 /card11 parts of the file only X parts Bom
Card7 Q1x

MB
post/ pre reverb connector molex male 4 pin right angle
+molex 4 pin female straight
208X 200X modules serie ,Buchla 200 upgraded viewtopic.php?f=17&t=243688&p=3444875#p3444875
FS :custom buchla 203 style càbinet ,skiff new design,boat ,hardware for diy cabinet ,easel case ,new 1u to 10u to 56u and more. / New 208 buchla card 12 price down atm/
HQ small case buchla psu PCB
viewtopic.php?p=3118393#3118393
viewtopic.php?t=211862&highlight=

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Re: Buchla 200X serie 208X build thread

Post by Radiance2021 » Wed Mar 31, 2021 1:45 am

thanks!

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Re: Buchla 200X serie 208X build thread

Post by ikkini » Sat Apr 03, 2021 5:52 pm

Hi Boops,

I started the project yesterday slowly, and I'm trying to have a look at everything.
I already see a future problem for me. Could you post pics and explanations for the vactrols. I don't know how to solder them on card 5, neither do I on card 10 & 11 (sorry your drawing didn't help me).

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Re: Buchla 200X serie 208X build thread

Post by boops » Sun Apr 04, 2021 4:09 am

ikkini wrote:
Sat Apr 03, 2021 5:52 pm
Hi Boops,

I started the project yesterday slowly, and I'm trying to have a look at everything.
I already see a future problem for me. Could you post pics and explanations for the vactrols. I don't know how to solder them on card 5, neither do I on card 10 & 11 (sorry your drawing didn't help me).
It seems you miss this BUILD links in the first post,putted in RED
Don’t forget it’s an original 70’s 208 clone ,with some upgrades and new functions.

https://www.modularsynthesis.com/roman/ ... 08spss.htm

viewtopic.php?f=17&t=127084
208X 200X modules serie ,Buchla 200 upgraded viewtopic.php?f=17&t=243688&p=3444875#p3444875
FS :custom buchla 203 style càbinet ,skiff new design,boat ,hardware for diy cabinet ,easel case ,new 1u to 10u to 56u and more. / New 208 buchla card 12 price down atm/
HQ small case buchla psu PCB
viewtopic.php?p=3118393#3118393
viewtopic.php?t=211862&highlight=

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Re: Buchla 200X serie 208X build thread

Post by boops » Mon Apr 05, 2021 9:09 am

The card 2,easy imho
40CA22AF-A056-4F80-A9AF-2FA2C9492064.jpeg
8D0CDBA0-5820-49C1-A754-299C97E72D30.jpeg
34374BC9-03B5-4A5D-BD40-B0924D1D21CF.jpeg
208X 200X modules serie ,Buchla 200 upgraded viewtopic.php?f=17&t=243688&p=3444875#p3444875
FS :custom buchla 203 style càbinet ,skiff new design,boat ,hardware for diy cabinet ,easel case ,new 1u to 10u to 56u and more. / New 208 buchla card 12 price down atm/
HQ small case buchla psu PCB
viewtopic.php?p=3118393#3118393
viewtopic.php?t=211862&highlight=

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Re: Buchla 200X serie 208X build thread

Post by steviet » Mon Apr 05, 2021 1:01 pm

Just made my massive Mouser order for these parts and my kit should be arriving in the next day or two. Very excited! I'm not sure I'll be building it anytime soon... but with these parts shortages I figured I'd better get the parts ordered up while they are still available.

Thanks! I'll post with my progress here in this thread once I actually begin building.
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Re: Buchla 200X serie 208X build thread

Post by DanaFo » Tue Apr 06, 2021 4:15 pm

My kit is in! the PCBs are gorgeous as is the case/faceplate, now I just need to jump on the bom ordering :) Merci Boops!

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Re: Buchla 200X serie 208X build thread

Post by ikkini » Tue Apr 06, 2021 5:00 pm

Hi Boops,

I'm a bit lost with X capacitors on the Main Board.
I can't find the following in the BOM :
- CX5
- CX1
- CX2
And also, I couldn't find R73X value in the BOM

Thanks for your help

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Re: Buchla 200X serie 208X build thread

Post by boops » Wed Apr 07, 2021 7:04 am

Edit of the 7 April 21

CX1 /CX2 10uf on the MB pcb ,are voltages filter electrolytics caps ,added for the seq reset, there are on the seq card 1 bom section .
CX5 is 10 nf (forgotten in the last bom update )but ordered in the basket,sorry

If you choose the option to have the reverb mix level cv ,in the headphone (monitor) circuit,too
Use R73 or any resistor above 1k for R73X ,this resistance will be in serie with the trimmer TRX11 to calibrate the dry audio signal return following your wish.
And make the jumper .
The pic of the motherboard modification for my new card 12 here
https://modularsynthesis.com/roman/boop ... card12.htm

the mod is already done on your 208X MB with the addition of a trimmer.
1EC43AF5-6B86-4D4C-B92C-B384A4F682A8.jpeg
First post edited
ikkini wrote:
Tue Apr 06, 2021 5:00 pm

Hi Boops,

I'm a bit lost with X capacitors on the Main Board.
I can't find the following in the BOM :
- CX5
- CX1
- CX2
And also, I couldn't find R73X value in the BOM

Thanks for your help
Card 3
Here addition of 2 resistors R39/45 in serie 12M +1M (13M) if you don’t find a 13M resistor
F80FCFBB-D0CA-43E2-8572-351E9EEF58FB.jpeg
6FEBA17A-7BED-46BD-9801-9F5B608D0C9E.jpeg
Card 4
FB5C9F9E-DB4D-4FE2-B108-571780A998D2.jpeg
208X 200X modules serie ,Buchla 200 upgraded viewtopic.php?f=17&t=243688&p=3444875#p3444875
FS :custom buchla 203 style càbinet ,skiff new design,boat ,hardware for diy cabinet ,easel case ,new 1u to 10u to 56u and more. / New 208 buchla card 12 price down atm/
HQ small case buchla psu PCB
viewtopic.php?p=3118393#3118393
viewtopic.php?t=211862&highlight=

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Re: Buchla 200X serie 208X build thread

Post by ikkini » Wed Apr 07, 2021 12:28 pm

Merci ! 🙏

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