Buchla 200X serie 208X build thread

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Re: Buchla 200X serie 208X build thread

Post by steviet » Thu Apr 08, 2021 9:25 am

Just received my kit!! Everything was beautifully packaged, and the boards + panel look amazing. Great quality on the 4u boat as well.

Great stuff boops, Merci!!
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Re: Buchla 200X serie 208X build thread

Post by boops » Fri Apr 09, 2021 2:52 pm

Thanks !

THE YIN YANG 208X
E07BCA59-D8BE-4C40-AA5C-1F3DEEBB430B.png
D7EA9B77-CCA0-41E8-A555-7F2D602F92A0.png
038F0737-CD3F-4646-BF0C-65DE1D7F71F9.png
7B567F24-E33F-44F0-A3E2-813DEC646066.png
2EFCA8AF-C363-4C1C-8340-E5CD638924B1.jpeg
0B67EC63-567E-4245-A853-64FEFAE60A57.jpeg
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Re: Buchla 200X serie 208X build thread

Post by Radiance2021 » Sun Apr 11, 2021 9:12 am

Question; can I substitute the 1N457 diode for a 1N4007? Or are there any specific specs to the 1N457 that makes it more suitable?

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Re: Buchla 200X serie 208X build thread

Post by boops » Mon Apr 12, 2021 4:02 am

Radiance2021 wrote:
Sun Apr 11, 2021 9:12 am
Question; can I substitute the 1N457 diode for a 1N4007? Or are there any specific specs to the 1N457 that makes it more suitable?
No ,use 1N457 it’s a general purpose small diode,buy them by 100 ,it’s cheap
If I have to change ,I will use a 1N4148
A 1N4007 is a big diodé often use in PSU for electric rectification,voltage up to 700V

You can find the datasheet here :
https://fr.farnell.com/on-semiconductor ... dp/1467558
https://fr.farnell.com/vishay/1n4007-e3 ... ?st=1n4007
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Re: Buchla 200X serie 208X build thread

Post by Radiance2021 » Mon Apr 12, 2021 4:27 am

I know, but I have a whole bunch of 1N4007's on the shelf...might as well use them if they fit the PCB.
so, other than being over specced (too havy) , is there another reason for NOT using the 1N4007?

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Re: Buchla 200X serie 208X build thread

Post by boops » Mon Apr 12, 2021 5:59 am

Radiance2021 wrote:
Mon Apr 12, 2021 4:27 am
I know, but I have a whole bunch of 1N4007's on the shelf...might as well use them if they fit the PCB.
so, other than being over specced (too havy) , is there another reason for NOT using the 1N4007?
The 400x série Rectifier diode have a different threshold and voltage drop than a Signal diode like the 1N457
The 4007 could be fine in some place on the circuit but not in another.
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Re: Buchla 200X serie 208X build thread

Post by Radiance2021 » Mon Apr 12, 2021 6:19 am

Thanks Boops!

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Re: Buchla 200X serie 208X build thread

Post by fallout » Tue Apr 13, 2021 3:47 pm

Got my package today. Looks great! Thanks.

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Re: Buchla 200X serie 208X build thread

Post by boops » Tue Apr 13, 2021 5:08 pm

fallout wrote:
Tue Apr 13, 2021 3:47 pm
Got my package today. Looks great! Thanks.
Thanks

You can see the position of the uA726 ,the indicator lug is pin 10 not 1
And Q1 the Jfet J112 in the place of the 2N4341,analog switch function,no sound here.

Card 6/card7
E888B4B0-86AB-44D8-82DD-9A5447A859A8.jpeg
992EBAC9-DEDA-444A-B1AC-A26FE1C8CFDC.jpeg
C7E24AAF-24F3-43EB-A7B7-D6EF5884D5FE.png
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
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Re: Buchla 200X serie 208X build thread

Post by Radiance2021 » Wed Apr 14, 2021 9:21 am

Couple of questions...
-what value is R20 on the Aux board?
-what value are Cx1, Cx2 and Cx5 on the main board?
- what value is R73X on the main board?

Could not find these in the "208 X Parts ONLY BOM REV1 26032021 2-fusionne.pdf" BOM

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Re: Buchla 200X serie 208X build thread

Post by ikkini » Wed Apr 14, 2021 3:39 pm

Radiance2021 wrote:
Wed Apr 14, 2021 9:21 am
Couple of questions...
-what value is R20 on the Aux board?
-what value are Cx1, Cx2 and Cx5 on the main board?
- what value is R73X on the main board?

Could not find these in the "208 X Parts ONLY BOM REV1 26032021 2-fusionne.pdf" BOM
I asked the same question on previous page (except from R20 on Aux card) :
viewtopic.php?f=17&t=243936&start=100#p3502656

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Re: Buchla 200X serie 208X build thread

Post by boops » Wed Apr 14, 2021 5:16 pm

Radiance2021 wrote:
Wed Apr 14, 2021 9:21 am
Couple of questions...
-what value is R20 on the Aux board?
-what value are Cx1, Cx2 and Cx5 on the main board?
- what value is R73X on the main board?

Could not find these in the "208 X Parts ONLY BOM REV1 26032021 2-fusionne.pdf" BOM
Aux pcb
R20=47k
Look at the first post ,please (there are some edits)
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Re: Buchla 200X serie 208X build thread

Post by Radiance2021 » Wed Apr 14, 2021 5:18 pm

Thanks Ikkini & Boops

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Re: Buchla 200X serie 208X build thread

Post by ikkini » Sat Apr 17, 2021 3:12 pm

Hi Boops,

I have a few questions, since I'm not an expert, I'm quite lost with the different links.

1. First, since I don't know which one is pin 10, is it correctly oriented ?
IMG_2591.JPG
2. Could you help me with the vactrols orientation using this chart ?
IMG_2592.JPG
3. On card 6, if we use Q1X we don't have to populate Q1 ? On card 7 if we use Q2, we don't have to populate Q1 ?

4. On card 5, R23 is labelled as 'Not used' but there's a resistor value in the BOM for this one ? What should we do ?

5. I can't find at a faire price the capacitor for C13 on card 12 (TVX1H4R7MAD), any idea where I could source it or if I can replace with a cheap and available capacitor ?

6. What are the shoulder washer for on card 12 ?

7. On MB, if I use the CV Reverb connector for B35, it will turn the banana into an input for reverb mix ?

Thanks for your help. :)

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Re: Buchla 200X serie 208X build thread

Post by boops » Sun Apr 18, 2021 3:17 am

Hi

the 2 links in this post are already in the first post .

Pics from Modularsynthesis

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

1. First, since I don't know which one is pin 10, is it correctly oriented ?
1C22280F-DFED-44EA-A23C-CF6693B287E5.jpeg
1C22280F-DFED-44EA-A23C-CF6693B287E5.jpeg (95.83 KiB) Viewed 589 times
Yes ,my tip is to not solder the uA726 ,(rare and expensive)the first time you install card 6 /7 ,in your case install the first logic cards 1/2/3/4 to be sure the voltages are not shorted .
Check deeptly your card 6 /7 before install it

2. Could you help me with the vactrols orientation using this chart ?
Only the led polarity is important .Follow the led symbol on the pcb ,a led is like a diode with an anode /cathode .
A=1 =+
B=2=-
CD no matter
90948AA3-0DDA-4987-A089-74B36834B671.jpeg
90948AA3-0DDA-4987-A089-74B36834B671.jpeg (85.7 KiB) Viewed 589 times

3. On card 6, if we use Q1X we don't have to populate Q1 ?
Yes you have to use ONLY one

On card 7 if we use Q2, we don't have to populate Q1 ?

Yes

4. On card 5, R23 is labelled as 'Not used' but there's a resistor value in the BOM for this one ? What should we do ?
You have to install R23 if you don’t want he AM mod ,not use it for a 208X

5. I can't find at a faire price the capacitor for C13 on card 12 (TVX1H4R7MAD), any idea where I could source it or if I can replace with a cheap and available capacitor ?
I use a CTS 13 tantalum ,you can use any standard axial electrolytic .4,7uf (25v mini )

6. What are the shoulder washer for on card 12 ?
To isolate the screw from the metal of the power transistor ,used only 3
You have to isolate the transistor body too,with mica or silicone thin material.

https://www.modularsynthesis.com/roman/ ... card12.htm


7. On MB, if I use the CV Reverb connector for B35, it will turn the banana into an input for reverb mix ?
What is the cv reverb connector you talk about? Install a small wire and a black banana for this input CV

F2550BAD-1088-413C-897A-F6AB15A1A9A3.png
AB24C234-7277-4E3B-80BE-9285FB5F3CD3.png
83DC556D-BF4A-480A-9FAA-B46715E660B6.png
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/
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viewtopic.php?p=3118393#3118393
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Re: Buchla 200X serie 208X build thread

Post by ikkini » Sun Apr 18, 2021 4:39 am

Thanks for the replies ! 🙏

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Re: Buchla 200X serie 208X build thread

Post by boops » Sun Apr 18, 2021 8:05 am

ikkini wrote:
Sun Apr 18, 2021 4:39 am
Thanks for the replies ! 🙏
Feel free to ask your questions ;),it’s a big project.


Card 3/4 with the ics orientations

EEFF6AC3-EA42-459E-9DCB-F351469E9617.jpeg
Card 8
E82221B5-6BF7-4FD2-94A0-AA37AE8CA5DE.jpeg
Card 9
71FC6A02-E4B6-4F95-8591-63D1444C6613.jpeg
Card 1 reset seq details,jumper AB
6567FCA5-5D9B-4431-9391-3F1A2AA996D5.jpeg
266756C1-2B95-4D99-9A5C-DCF8F184B192.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
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Re: Buchla 200X serie 208X build thread

Post by boops » Sun Apr 18, 2021 12:46 pm

After your psu voltages have been tested fine.

Initial 208X Power On ,208X Calibrations..pdf
(9.57 MiB) Downloaded 6 times

I use a small screw driver ,max 1mm diameter and I pass thru each hole of the molex connectors

Connection of the step 2 serie 200 switch ,3 wires to solder on the MB.
You can see the right angle molex ,it will be connected to aux noise pcb.
D982A3B5-337D-478A-98AD-238E33C21F0E.jpeg
C29CDF58-73C4-4FBF-AFF8-ACD107444486.jpeg
I install the card 3,card 4 Only
B482C98E-CFD2-4328-BFFE-206AF5718085.jpeg
I control each functions

Then the card 1,control ,card 2 ,control if everything is ok
Your logic boards are finished without issue,well done !
You can see the position of the boat /208X to do this
0C67E9E6-F002-4615-AEAC-427CAA7CEDAA.jpeg
Check that the boards are well installed ,pin 1 male to pin 1 female,before each power on
When you want to take off a card ,be careful with your switches,on the front panel ,I prefer put the ensemble (the 208x alone)on my legs than on a table.
TIP
Better to avoid to solder with the ics installed on a board,cause if your solder iron is not ground coupled with the module
Fragiles ics can burnt.Install your ic at the end.

Card 10 ,Card 11,Card 12
531B898B-AB10-4E0B-AA72-7C2939E7BA70.jpeg
3C0C80BD-09DF-4087-AA0C-8433F9B37FEC.jpeg
6F013A07-EE5E-4905-9412-85E464232DB8.jpeg
F30D68E0-7FFD-449F-9300-09307A35DF7C.jpeg
21EB23D1-8DB5-4E2A-BD7B-34866249CFBE.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
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Re: Buchla 200X serie 208X build thread

Post by ikkini » Fri Apr 23, 2021 1:52 pm

Hi Boops,

I'm almost done ! I just need a few trimmers and switches that are missing, but it's mainly built now.

I have a few more questions :

1. If I populated R73, I don’t need to populate R73X ? Do I still need to jumper the two resistors next to TR11X ?

2. Where do we connect the Signal in jack ? On the connector on card n°10 ? If so what is the polarity ? If not, what is this connector for ?

3. What is this red wire on your picture ?
D982A3B5-337D-478A-98AD-238E33C21F0E.jpg
4. Concerning the wfX switch, does it connect to the 1 2 3 holes on card n°7 ? Could you show us the wiring ?

5. What is the use of the SW24X on the back of the MB ?

6. Could you please give me the reference for SW24X ?

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Re: Buchla 200X serie 208X build thread

Post by ikkini » Fri Apr 23, 2021 2:35 pm

7. Could you help with the orientation of Q3 to Q6 on card n°12 ?

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Re: Buchla 200X serie 208X build thread

Post by boops » Sat Apr 24, 2021 4:03 am

ikkini wrote:
Fri Apr 23, 2021 2:35 pm
7. Could you help with the orientation of Q3 to Q6 on card n°12 ?
From the link in the first post card 12 build
F3F9B5BA-B425-448F-BBB2-B431C67096C7.png
208X 200X modules serie ,Buchla 200 upgraded viewtopic.php?f=17&t=243688&p=3444875#p3444875
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Re: Buchla 200X serie 208X build thread

Post by boops » Sat Apr 24, 2021 4:19 am

1. If I populated R73, I don’t need to populate R73X ? Do I still need to jumper the two resistors next to TR11X ?



From the first post

If you choose the option to have the reverb mix level cv ,in the headphone (monitor) circuit,too
Use R73 or any resistor above 10k 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.

If I populated R73, I don’t need to populate R73X ?
Yes

Do I still need to jumper the two resistors next to TR11X ?

No

My advice is at the beginning dont do the mod on the MB install R73 ,don’t do the jumper ,just install TRx11,if you want experimenting later

2. Where do we connect the Signal in jack ? On the connector on card n°10 ? If so what is the polarity ? If not, what is this connector for ?


It’s a mono audio wire ,it’s to connect the external audio signal to the amp (preamp) in the lpg1
Hot for the signal ,g for ground of your wire, to the normalized tiny jack see pic
Ground and the tiny jack switch connected left ,middle in the pic ,hot signal alone at right in the pic
You can solder directly to the card 10,but a connector is handy.
You can see that I use a Grover washer under each tinyjack
91C18163-DC08-44FE-87B3-207CEA1CE582.jpeg
313C1CBB-6B1B-4A41-B89E-BE57B2F738CC.jpeg
3. What is this red wire on your picture ?
‪‬
97397E02-A30C-44BA-A416-71087A3CD8DB.jpeg
97397E02-A30C-44BA-A416-71087A3CD8DB.jpeg (84.77 KiB) Viewed 428 times
‪You don’t need it ‬


4. Concerning the wfX switch, does it connect to the 1 2 3 holes on card n°7 ?
Yes

Could you show us the wiring ?
Respect your switch wiring 2 is the middle of the switch
Pic to follow

5. What is the use of the SW24X on the back of the MB ?

It’s the old hi range connection ,you don’t need to use it,already made.

6. Could you please give me the reference for SW24X ?
...

Could you help with the orientation of Q3 to Q6 on card n°12 ?
You can see the 3 isolators
My transistors brand don’t need a shoulder washer ,check yours.
35CE3BD4-4F7F-4645-9720-B6096A5ED304.jpeg
Last edited by boops on Sat Apr 24, 2021 4:36 am, edited 10 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
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Re: Buchla 200X serie 208X build thread

Post by ikkini » Sat Apr 24, 2021 4:20 am

Thanks Boops, I've seen this link, but I don't know how the transistors must be oriented.

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Re: Buchla 200X serie 208X build thread

Post by boops » Tue Apr 27, 2021 3:14 am

From the new card 12 build thread (link in the first post)
24048217-7DA6-4649-B3E5-B861E7DD9804.png
A35A2267-CA35-44A1-AC21-E63CEC257442.png
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 Apr 27, 2021 3:54 am

ikkini wrote:
Sat Apr 24, 2021 4:20 am
Thanks Boops, I've seen this link, but I don't know how the transistors must be oriented.

Take for example the BD437TG. As you can see in the pic below it has a text side and a heatsink side.
s-l640.jpg
This should give you a clue on how to mount these....

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