Buchla 200X serie 208X build thread

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ikkini
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Re: Buchla 200X serie 208X build thread

Post by ikkini » Tue Apr 27, 2021 6:43 am

Thanks, but the one I have has two black sides. But I've had Boops on the phone and it should ok.

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Re: Buchla 200X serie 208X build thread

Post by Radiance2021 » Tue Apr 27, 2021 1:54 pm

ikkini wrote:
Tue Apr 27, 2021 6:43 am
Thanks, but the one I have has two black sides. But I've had Boops on the phone and it should ok.
Any findings you want to share for others with the same problem / questions?

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Re: Buchla 200X serie 208X build thread

Post by ikkini » Tue Apr 27, 2021 3:29 pm

Well the two others had a metal side, so I aligned the four based on these two.

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Re: Buchla 200X serie 208X build thread

Post by boops » Tue Apr 27, 2021 4:45 pm

Card 5 to Card 12
D5BB8A76-A397-4729-B1BF-3CCE45015100.jpeg
A3770DF9-7A60-4CB6-BCB6-8798AC1FF5B9.jpeg
9D52EAEC-2C06-4C92-A503-B0B1C0E47167.jpeg
wfX switch
59494667-42C9-43EC-B777-D34F9F405657.jpeg
59494667-42C9-43EC-B777-D34F9F405657.jpeg (106.72 KiB) Viewed 743 times
wfX connector card7
99B37EAE-8519-4478-9AA7-FF940C57A5DD.jpeg
B4AD25A6-5712-43EC-826F-FF5A824B1527.jpeg
DD943B8E-F9E4-4971-9707-A092783C35A5.jpeg
3355DE86-3082-467D-AAD5-385EF703DD70.jpeg
670EC2B0-5C80-48BF-9EFE-B70C7BCB1DA9.jpeg
17B2FAA8-DEBD-4208-BC38-701C0B39E905.jpeg
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Re: Buchla 200X serie 208X build thread

Post by boops » Tue Apr 27, 2021 4:47 pm

2D44E669-3648-4E88-A074-E5A1F09CD6DD.jpeg
FA500444-8B55-4F6A-A357-236EBBD39246.jpeg
FC624B02-1935-4206-A327-C2AE471E8F6D.jpeg
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Re: Buchla 200X serie 208X build thread

Post by boops » Wed Apr 28, 2021 8:09 am

Missing a small trace card 8 ,it s happened when we reduce the card ,to not touch the reverb frame ,sorry
Above or below,add a small wire.
Attachments
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Re: Buchla 200X serie 208X build thread

Post by ikkini » Wed Apr 28, 2021 8:26 am

I did my first tests.

I nee more Molex for card 12, so I couldn't test that.
I need the two switches for sequencer 2 steps and wfX so I left it unpopulated.

For what I could check :
- enveloppe seem to work correctly
- Pulser : on keyboard mode, I get nothing. On self mode, I get the exact same behaviour as on sequencer mode (sequencer trigger starts the Pulser). I can't get the Pulser to play pulses on its own.
- Sequencer : It stays on step one whatever I do.
- Withour card 12 I could just check MO on mod c.v. output, I get the correct shapes but it seems to play at a static low frequency whenever I move Frequency slider or change from Low to Hi mode.

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Re: Buchla 200X serie 208X build thread

Post by boops » Wed Apr 28, 2021 4:36 pm

Ikkini


I need the two switches for sequencer 2 steps and wfX so I left it unpopulated.

-You need at least a resistor connected on the timbre circuit on the card 7 ,you need the switch .

For what I could check :
- enveloppe seem to work correctly
- Pulser : on keyboard mode, I get nothing.

Will work with an external pulse/trig


On self mode, I get the exact same behaviour as on sequencer mode (sequencer trigger starts the Pulser). I can't get the Pulser to play pulses on its own.

Itself :You need to start the pulser , with once pulse ,action the momentary ;just one shot

- Sequencer : It stays on step one whatever I do.

Choose pulser source ,and itself for the pulser




- Withour card 12 I could just check MO on mod c.v. output, I get the correct shapes but it seems to play at a static low frequency whenever I move Frequency slider or change from Low to Hi mode.

Don’t install analog card ,if your 4 logic board 1/2/3/4 don’t work 100%
As it’s written in the power on pdf.
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Re: Buchla 200X serie 208X build thread

Post by ikkini » Wed Apr 28, 2021 4:58 pm

Thanks for your reply.

I used my 218 to test the 208, the 218 Pulse triggers the Enveloppe (and is understood by the sequencer, even if it doesn't advance it is transmitted to the Pulser and the Enveloppe) but not the Pulser.
I knew how to start the Pulser for self clocking (thanks Youtubers) but it doesn't work.

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Re: Buchla 200X serie 208X build thread

Post by boops » Thu Apr 29, 2021 2:55 am

ikkini wrote:
Wed Apr 28, 2021 4:58 pm
Thanks for your reply.

I used my 218 to test the 208, the 218 Pulse triggers the Enveloppe (and is understood by the sequencer, even if it doesn't advance it is transmitted to the Pulser and the Enveloppe) but not the Pulser.
I knew how to start the Pulser for self clocking (thanks Youtubers) but it doesn't work.
Come back to the base .
You have to use only the cards 3 + 4 up to the both are 100%,OK
Do you have the 13,5 V ref ?

The seq need at least the original resistor 200k ( step 3 ,)connected in the circuit ,if you didn’t install the switch

You can use the card 12 later with only the quad Aop U2 installed ,all the signals pass thru,then no reverb of course.

DONT FORGET :ON CARD 12 TO SHORT PIN 15/16

THERE IS AN EDIT POST 1 ABOUT CARD 8
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Re: Buchla 200X serie 208X build thread

Post by ikkini » Thu Apr 29, 2021 3:57 am

Well I started with card 4 only, and didn't get the Pulser to work properly as I mentionned before.

Then I installed card 3 and the enveloppe worked as expected, except that sometimes on startup it was self cycling.

Concerning the Seq, as I told you, it was stucked on the first step (but it received pulse, because it was transmitted to the Enveloppe and the Pulser). I'll wait for the switch for 2 steps then before I try it again.



DONT FORGET :ON CARD 12 TO SHORT PIN 15/16

Could you explain that ?

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Re: Buchla 200X serie 208X build thread

Post by boops » Thu Apr 29, 2021 6:29 am

ikkini wrote:
Thu Apr 29, 2021 3:57 am
Well I started with card 4 only, and didn't get the Pulser to work properly as I mentionned before.

Then I installed card 3 and the enveloppe worked as expected, except that sometimes on startup it was self cycling.

Concerning the Seq, as I told you, it was stucked on the first step (but it received pulse, because it was transmitted to the Enveloppe and the Pulser). I'll wait for the switch for 2 steps then before I try it again.



DONT FORGET :ON CARD 12 TO SHORT PIN 15/16

Could you explain that ?
From the card 12 build thread

Pin 7 and 9 are the 2 lpg out MO and CO ,this is the spot to separate them if you want or short for the same out in the tiny jacks x2 on the front panel
Short 15/16 with a wire
520C43CA-599A-47B8-842E-42C8A7BC50A6.jpeg
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Re: Buchla 200X serie 208X build thread

Post by Radiance2021 » Thu Apr 29, 2021 3:24 pm

Regarding the importance of matched vactrols, I know the vactrols on card 10 & 11 need to be matched (I know it's easier to use the VTL5C3/2 but I got hold of 20 NOS Vactec VTL5C3's so that's what I'm going to use).

But what about the vactrol pairs on Card 5 (1&2, 3&4 and 6&7)?
On this page of Dave Browns site it's suggested to match these pairs (https://modularsynthesis.com/roman/buch ... 08spss.htm ). What will be the audible effects of matched versus non-matched vactrols on card 5?

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Re: Buchla 200X serie 208X build thread

Post by boops » Thu Apr 29, 2021 4:12 pm

If well matched you will have the same levels in the modulations,you can tweak some resistors ,too
The AM mod is an example .
Radiance2021 wrote:
Thu Apr 29, 2021 3:24 pm
Regarding the importance of matched vactrols, I know the vactrols on card 10 & 11 need to be matched (I know it's easier to use the VTL5C3/2 but I got hold of 20 NOS Vactec VTL5C3's so that's what I'm going to use).

But what about the vactrol pairs on Card 5 (1&2, 3&4 and 6&7)?
On this page of Dave Browns site it's suggested to match these pairs (https://modularsynthesis.com/roman/buch ... 08spss.htm ). What will be the audible effects of matched versus non-matched vactrols on card 5?
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 ikkini » Fri Apr 30, 2021 9:30 am

Ok, I think I found the reason for all the issues I had. I used switches I already had for SW1, SW8, SW9, SW10, SW22 and SW23 !
The functions that do not work all correspond to the middle position of the switch ! Just ordered 6 100DP6T1B1M1QEH !
I will have a hard time de-soldering the switches but I think it should fix it !

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Re: Buchla 200X serie 208X build thread

Post by boops » Fri Apr 30, 2021 10:19 am

boops wrote:
Fri Apr 30, 2021 10:19 am
Use a dremel tool ,with a thin disk,if you have not the good desolder tools these,are dpdt 6 pins hard to desolder without destroy the pcb traces.
Last edited by boops on Sat May 01, 2021 3:02 am, edited 1 time in total.
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Re: Buchla 200X serie 208X build thread

Post by Radiance2021 » Fri Apr 30, 2021 3:18 pm

ikkini wrote:
Fri Apr 30, 2021 9:30 am
..... I used switches I already had for SW1, SW8, SW9, SW10, SW22 and SW23 !
...and these where not On-On-On switches like the 100DP6T1B1M1QEH ?

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Re: Buchla 200X serie 208X build thread

Post by momo » Fri Apr 30, 2021 3:38 pm

ikkini wrote:
Fri Apr 30, 2021 9:30 am
I will have a hard time de-soldering the switches but I think it should fix it !
If you have time, this slightly techchnical, but fascinating presentation from Pace explains some desoldering dos and don'ts: https://youtu.be/h_RiRL-flgs. Or if you're busy, for these types of components to desolder, you can really only do it with relativer success using a vacuum rework tool per this Pace vid: https://youtu.be/e8KRPFOD1RE.

My advice would be to try to find someone with the tool (usually a compressor and pistol style solder extraction wand). If you have never seen the difference, I have cued this video to show you: https://youtu.be/kH6s5dy2L6E?t=96 which will make this a breeze with minimal chance of PCB damage. If you try by e.g. a hand solder pump, you might find it very fiddly and frustrating and resulting in irreversible damage to the PCB. Good luck.

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Re: Buchla 200X serie 208X build thread

Post by ikkini » Fri Apr 30, 2021 4:44 pm

@Radiance2021
They should have been ON-ON-ON but clearly all the issues I had comes from the center position of the switches that doesn't work. I don't have enough knowledge to understand the difference, but I'm pretty confident in the fact that changing them for the ones recommanded by Boops will solve these issues.

@momo
Thanks for the links, I'll look at the videos for sure. I successfully desoldered a switch (before my very old hand pump died). It removed almost all solder in one shot, and then I moved gently the switch back and forth while heating the legs one after another and after some time it came out. I hope I'll be lucky enough to get the 5 others this way because I don't have any idea of where I could find the magical tool you showed !

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Re: Buchla 200X serie 208X build thread

Post by boops » Sat May 01, 2021 2:57 am

@ikkini ,well done ...just 5 to desolder,good luck
@thanks Momo for the links

MORE TIPS
Control all your Switches ,the good reference but if they work correctly ,too.

Solder your resistors the gold ring (5%) on the right ,horizontal or down ,vertical positions,then you will easily compare their values with the pics in the above posts. ,if needed.
Last edited by boops on Sat May 01, 2021 3:06 am, edited 1 time in total.
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Re: Buchla 200X serie 208X build thread

Post by boops » Sat May 01, 2021 3:00 am

208X MB V4 pdf if needed to debug.
PCB_208X MB V4.pdf
(1.13 MiB) Downloaded 16 times
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Re: Buchla 200X serie 208X build thread

Post by boops » Tue May 04, 2021 7:59 am

The upper middle tinnerman needs to be reduce a little to avoid short again audio tiny jacks
2F7FB9AE-B804-4125-9945-9D4757C347C5.jpeg
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HQ small case buchla psu PCB
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Re: Buchla 200X serie 208X build thread

Post by ikkini » Wed May 05, 2021 9:50 am

Ok, I received the new switches, the Pulser now works, but I have some issues because, as I thought, I did a bit of damages while desoldering.
It's now debug and spaghetti time !

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Re: Buchla 200X serie 208X build thread

Post by ikkini » Wed May 05, 2021 10:36 am

Ok, I've repaired with wires.
Pulse OK
Enveloppe OK
Sequencer receives Pulse (I can see it when triggering the enveloppe from sequencer), but stays on step one...

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Re: Buchla 200X serie 208X build thread

Post by ikkini » Wed May 05, 2021 3:17 pm

boops wrote:
Tue Apr 27, 2021 4:45 pm
Card 5 to Card 12
D5BB8A76-A397-4729-B1BF-3CCE45015100.jpegA3770DF9-7A60-4CB6-BCB6-8798AC1FF5B9.jpeg9D52EAEC-2C06-4C92-A503-B0B1C0E47167.jpeg
wfX switch59494667-42C9-43EC-B777-D34F9F405657.jpeg
wfX connector card7

99B37EAE-8519-4478-9AA7-FF940C57A5DD.jpeg

B4AD25A6-5712-43EC-826F-FF5A824B1527.jpegDD943B8E-F9E4-4971-9707-A092783C35A5.jpeg3355DE86-3082-467D-AAD5-385EF703DD70.jpeg670EC2B0-5C80-48BF-9EFE-B70C7BCB1DA9.jpeg17B2FAA8-DEBD-4208-BC38-701C0B39E905.jpeg
There's a reversed diode on card 5 ! ;)

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