New buchla 208 card 12,sound demo Bom /pcb available

From circuitbending to homebrew stompboxes & synths, keep the DIY spirit alive!

Moderators: lisa, Kent, Joe.

User avatar
boops
Ultra Wiggler
Posts: 757
Joined: Mon May 06, 2013 6:06 am
Location: Paris France
Contact:

New buchla 208 card 12,sound demo Bom /pcb available

Post by boops » Tue Jan 08, 2019 3:38 am

First ,thanks to all the pioneers (like me) builders who have spent time and shared their experiences since 5 years now,especially Roman F,Dave brown ,
Vediscapes,Papz,beautyof decay,Djangosfire,Dunnington audio,Captanapalm, xpander ,special thanks to Phildao for his 208 parts layout cards work ,etc

Im a musician since 42 years now,i ve always listened the electronics parts,like film capacitors,mustard without memory,MKP LCC resistors ceramic carbon composition 1 % without noise, CTS 13 caps ,etc i know the most important in a circuit is the original design ,then layout and the choice of parts which is important for the character of the instrument .(vintage coloration or neutral,frequency,spectre...)

Don Buchla was a genius designer,in 70s the parts he used in the card 12 of the 208 ,the 4136 is acceptable but here the lm 380 was far to be good to drive a spring reverb tank ,and the phone amplifier is .....then

i build my last 208 (i’ve built 16),i use Papz pcb first batch,lots of mods but the quality of the pcb is great,trying to use selected parts ,in the audio path like the original,the addition of each steps parts quality at the end give me a incredible sound ,imho more fat organic and present ,the logic stable .We ve designed a new card 12 as an option with a new audio bus,real reverb driver with one filter option,a 2W ,4 ohms phone out .and the Mo dry audio out separate.Bye bye the Lm 380n :nana:

pic of the original card 12 ,with only the main audio parts ,aop resitors input ,aop ceramic compensation caps ,one quad aop,handy for the diy builders to test the first cards.

Finally,i dont keep the 10k mod on the mother board,for more reverb level.
03 /05
A reverb mix level CV circuit (vactrol based) is ready to test,more in a few days
09/04
Monsieur davebr page at Modularsynthesis
https://modularsynthesis.com/roman/boop ... card12.htm
Many thanks

20/03 Captannapalm audio test a few posts below (thanks) and his mouser bom
Here is a Mouser BOM. This does not include a quad op amp U2, IC sockets, or the J2 & J3 headers/plugs for reverb cables. I built mine with this BOM and everything works great. I only changed C7/C8 after I built mine because the form factor was big. C13 is also big but there’s room for it, and Mouser didn’t have a smaller one for that value.
https://www.mouser.com/ProjectManager/P ... 46bb3779c5




13 03 2019 :reverb connection added
11 03 2019:Card pcb/heatsink built infos +mother board little mod

05 03 2019 :Bom available below


04 03 2019 price is 40 eu /reverb pot mix level pcb +bracket is 15eu
28 02 2019
the final test is better than expected ,all is ok
i ve installed the RC filter for the reverb,and keep it .
video :Phones test with a 8 ohm guitar cabinet,camera mic ,the level is really loud,i will test it with a real monitor with a tweeter ,later.
price for the pcb 40 eu pm
https://soundcloud.com/boops95/buchla-2 ... b-internal
https://soundcloud.com/boops95/buchla-2 ... 12-upgrade

https://soundcloud.com/boops95/buchla-2 ... 2-mo-alone

Phone test


Image
Image
Image
https://soundcloud.com/boops95/buchla-2 ... b-internal
https://soundcloud.com/boops95/buchla-2 ... 12-upgrade

https://soundcloud.com/boops95/buchla-2 ... 2-mo-alone

Image
ImageImage
ImageImage
ImageImageImage


BUILT INFOS
first notes
Check 5 times ,solder one time ;)


the motherboard mod is needed for a smooth control of the reverb imho

-the right jack socket is the direct audio out MO by default (or the CO if you choose it),it has a Level 100% ,no reverb




BOM
RE resitors ,PE pots are already on the 208 motherboard
The value of these pots is a plus for better impedance (optional)
1-4 is for 1/4 W resistors
mods
If you want your 208 more punchy change
R19-R42 was 150k by 330k
If you want more reverb level
Change R13 was 220k by 470k


capacitors 100pf/220pf are ceramic single layer SLCC

others are film,polyester MKT/polypropylène MKP see pics

c4 MKP or MKT axial cap 17,8/ 6 6 hight 17,8 mm width

Q1Q2 check for shortcut ,its tight!
Q3 Q4 Q5 Q6 need a SINGLE heatsink for thermal coupling and have to be isolated ,i use silicone ,only Q6 is not isolated

heatsink built
use a 1mm or 1,5mm aluminium around 40mm x15 mm
the holess are 3,2mm
print the pdf or the fpd if you want order it
see pics for the right installation
CHECK 5 TIMES SOLDER 1 TIME
U1 U2 U3 in the bom ,modern ones are used,(the dip ic become obsolete thought)but you can use a lot of others refs,
and following your ears keep the right one.
just check the datasheet for pinout
example for the quad aop ,a tlo74 should work,,the 4136 NO
u2 /u3 available at mouser
TLC081 is not TLO81 !

tlc081

OPA134

Reverb connections:
use Idc male and female connector x2 for J2/J3
the red pin on the pic is the hot /Signal point the other the ground of your shielded cable

Tip: use your master ,big red knob at a good level 8/9/10 then you can have a great mix of vcos/reverb

Begin with flat parts
R1 1k
R4 100R
R41 33k
R24 10k

The 4 x diodes check the polarity
IC sockets 2x 4 /8 pins and 0ne 2x7 14 pins to Aop experimentations later

C18/C19 solder them on the top ,check the polarity before.

MOTHERBOARD little mod,you dont need to move the panel!
Just put solder on each side of R73 /10k (RE2 on the schema) push it ,with a resistor leg to take it off.
Solder a new 10k resistor ,protect the legs if needed .Check pics and the schema
you can have the CO alone ,see pic
Image
Image
ImageImage


Image
ImageImage
Image
Image
ImageImage

LISTEN a few posts BELOW the audio test of Captanapalm
You do not have the required permissions to view the files attached to this post.
Last edited by boops on Sat Jun 01, 2019 2:15 am, edited 75 times in total.
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 /
HQ small case buchla psu PCB
https://www.muffwiggler.com/forum/viewt ... 93#3118393
https://www.muffwiggler.com/forum/viewt ... highlight=

User avatar
Synesthesia
Northern Light Modular
Posts: 1566
Joined: Wed Sep 02, 2009 8:35 am
Location: Limerick, Ireland
Contact:

Post by Synesthesia » Tue Jan 08, 2019 4:02 am

Cool, i could use a card 12 replacement on my easel actually.

what is your plan for those ? will you offer them ?

fg
Common Wiggler
Posts: 120
Joined: Wed Dec 10, 2014 4:18 pm
Location: rennes

Post by fg » Tue Jan 08, 2019 4:02 am

very interesting !!

do you have a schematic ?
thx

User avatar
boops
Ultra Wiggler
Posts: 757
Joined: Mon May 06, 2013 6:06 am
Location: Paris France
Contact:

Post by boops » Tue Jan 08, 2019 4:16 am

Synesthesia wrote:Cool, i could use a card 12 replacement on my easel actually.

what is your plan for those ? will you offer them ?

After sound demos ,if you find the sound great,i will offer diy card or built ones ,sure
Last edited by boops on Tue Jan 08, 2019 5:45 am, edited 2 times in total.
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 /
HQ small case buchla psu PCB
https://www.muffwiggler.com/forum/viewt ... 93#3118393
https://www.muffwiggler.com/forum/viewt ... highlight=

User avatar
boops
Ultra Wiggler
Posts: 757
Joined: Mon May 06, 2013 6:06 am
Location: Paris France
Contact:

Post by boops » Tue Jan 08, 2019 4:18 am

fg wrote:very interesting !!

do you have a schematic ?
thx
In the future sure ,diyers will need it.
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 /
HQ small case buchla psu PCB
https://www.muffwiggler.com/forum/viewt ... 93#3118393
https://www.muffwiggler.com/forum/viewt ... highlight=

User avatar
hox3d
Common Wiggler
Posts: 98
Joined: Fri Feb 02, 2018 6:30 am
Location: Grenoble, Alps

Post by hox3d » Tue Jan 08, 2019 8:17 am

Looks nice!

Didn't build an easel yet (saving money, money, money) so I could not tell the flaws of the original design.

So what does your card does (or does not) exactly compared to an original/clone one?

Would it involve modding the front panel?
Matte-fueled habits

Karl71
Common Wiggler
Posts: 61
Joined: Thu Jul 28, 2016 1:30 pm
Location: Finland

Post by Karl71 » Wed Jan 09, 2019 1:59 pm

Looks good, definitely interested x2.

User avatar
sendepause
Common Wiggler
Posts: 231
Joined: Mon Jan 20, 2014 3:54 am
Location: Amsterdam

Post by sendepause » Wed Jan 09, 2019 3:46 pm

Will the new card be plug & play? Very much interested. Separate out for each osc is a great feature. Very much looking forward to this....

User avatar
boops
Ultra Wiggler
Posts: 757
Joined: Mon May 06, 2013 6:06 am
Location: Paris France
Contact:

Post by boops » Wed Jan 09, 2019 3:46 pm

no panel mod,just a little mod on the mother board easy to do on already built 208 ,a wire to solder for the separate MO direct output if choosen

im waiting some news reverb tanks for sound demo .one with 2 springs and another with 3 springs to compare.

hox3d wrote:Looks nice!

Didn't build an easel yet (saving money, money, money) so I could not tell the flaws of the original design.

So what does your card does (or does not) exactly compared to an original/clone one?

Would it involve modding the front panel?
Last edited by boops on Thu Jan 10, 2019 2:17 am, edited 1 time in total.
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 /
HQ small case buchla psu PCB
https://www.muffwiggler.com/forum/viewt ... 93#3118393
https://www.muffwiggler.com/forum/viewt ... highlight=

User avatar
edwinm
Common Wiggler
Posts: 239
Joined: Mon Aug 05, 2013 4:31 pm
Location: London

Post by edwinm » Wed Jan 09, 2019 4:02 pm

Separate MO direct output?? Yes!!

User avatar
boops
Ultra Wiggler
Posts: 757
Joined: Mon May 06, 2013 6:06 am
Location: Paris France
Contact:

Post by boops » Fri Jan 11, 2019 7:15 am

edwinm wrote:Separate MO direct output?? Yes!!

yes before the pot ,with a right audio level (aop)
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 /
HQ small case buchla psu PCB
https://www.muffwiggler.com/forum/viewt ... 93#3118393
https://www.muffwiggler.com/forum/viewt ... highlight=

User avatar
boops
Ultra Wiggler
Posts: 757
Joined: Mon May 06, 2013 6:06 am
Location: Paris France
Contact:

Post by boops » Mon Jan 14, 2019 2:29 pm

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 /
HQ small case buchla psu PCB
https://www.muffwiggler.com/forum/viewt ... 93#3118393
https://www.muffwiggler.com/forum/viewt ... highlight=

User avatar
boops
Ultra Wiggler
Posts: 757
Joined: Mon May 06, 2013 6:06 am
Location: Paris France
Contact:

Post by boops » Mon Jan 14, 2019 2:51 pm

Last edited by boops on Tue Jan 15, 2019 2:36 am, edited 2 times in total.
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 /
HQ small case buchla psu PCB
https://www.muffwiggler.com/forum/viewt ... 93#3118393
https://www.muffwiggler.com/forum/viewt ... highlight=

User avatar
boops
Ultra Wiggler
Posts: 757
Joined: Mon May 06, 2013 6:06 am
Location: Paris France
Contact:

Post by boops » Mon Jan 14, 2019 3:52 pm

sound to come
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 /
HQ small case buchla psu PCB
https://www.muffwiggler.com/forum/viewt ... 93#3118393
https://www.muffwiggler.com/forum/viewt ... highlight=

User avatar
hox3d
Common Wiggler
Posts: 98
Joined: Fri Feb 02, 2018 6:30 am
Location: Grenoble, Alps

Post by hox3d » Tue Jan 15, 2019 4:11 am

Could you make a comparison with/without?

It's hard to make my mind about it, since I don't know (yet) what an Easel sounds like.
Matte-fueled habits

User avatar
pathein
Common Wiggler
Posts: 133
Joined: Thu Jan 09, 2014 4:54 pm

Post by pathein » Tue Jan 15, 2019 6:22 am

love to get it, any estimation on ready date or cost of the ready made one?

User avatar
boops
Ultra Wiggler
Posts: 757
Joined: Mon May 06, 2013 6:06 am
Location: Paris France
Contact:

Post by boops » Tue Jan 15, 2019 8:53 am

i m waiting a quote from a pcb supplier in a few hours.i will have some to sell in 2 weeks



https://soundcloud.com/boops95/buchla-2 ... b-internal

https://soundcloud.com/boops95/buchla-2 ... b-internal
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 /
HQ small case buchla psu PCB
https://www.muffwiggler.com/forum/viewt ... 93#3118393
https://www.muffwiggler.com/forum/viewt ... highlight=

User avatar
boops
Ultra Wiggler
Posts: 757
Joined: Mon May 06, 2013 6:06 am
Location: Paris France
Contact:

Post by boops » Thu Feb 07, 2019 4:05 pm

News
the phone circuit is done
i will reveive some boards to sell around the 15 th
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 /
HQ small case buchla psu PCB
https://www.muffwiggler.com/forum/viewt ... 93#3118393
https://www.muffwiggler.com/forum/viewt ... highlight=

User avatar
pathein
Common Wiggler
Posts: 133
Joined: Thu Jan 09, 2014 4:54 pm

Post by pathein » Wed Feb 20, 2019 3:22 pm

Hi boops,

just wondering any updates on the new card 12?

User avatar
boops
Ultra Wiggler
Posts: 757
Joined: Mon May 06, 2013 6:06 am
Location: Paris France
Contact:

Post by boops » Thu Feb 21, 2019 4:05 am

Image
pathein wrote:Hi boops,

just wondering any updates on the new card 12?
Arrived todayImage
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 /
HQ small case buchla psu PCB
https://www.muffwiggler.com/forum/viewt ... 93#3118393
https://www.muffwiggler.com/forum/viewt ... highlight=

User avatar
pathein
Common Wiggler
Posts: 133
Joined: Thu Jan 09, 2014 4:54 pm

Post by pathein » Thu Feb 21, 2019 4:20 pm

:banana:

awesome, looking forward getting it soon!

Karl71
Common Wiggler
Posts: 61
Joined: Thu Jul 28, 2016 1:30 pm
Location: Finland

Post by Karl71 » Sat Feb 23, 2019 1:02 pm

Any news on availibility?

User avatar
boops
Ultra Wiggler
Posts: 757
Joined: Mon May 06, 2013 6:06 am
Location: Paris France
Contact:

Post by boops » Sun Feb 24, 2019 9:14 am

Next days,sure.
i have to build one to test ,everything is fine.
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 /
HQ small case buchla psu PCB
https://www.muffwiggler.com/forum/viewt ... 93#3118393
https://www.muffwiggler.com/forum/viewt ... highlight=

User avatar
beautyofdecay_
no maps for this area
Posts: 330
Joined: Sun Feb 27, 2011 2:26 pm
Location: Netherlands

Post by beautyofdecay_ » Tue Feb 26, 2019 4:17 am

That's a cool upgrade!
Looking forward to hearing the results of your test.

User avatar
boops
Ultra Wiggler
Posts: 757
Joined: Mon May 06, 2013 6:06 am
Location: Paris France
Contact:

Post by boops » Thu Feb 28, 2019 11:02 am

the final test is better than expected ,all is ok
video :Phones test with a 8 ohm guitar cabinet,camera mic ,the level is really loud,i will test it with a real monitor with a tweeter
Phone test




Image
Image
Image
Image
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 /
HQ small case buchla psu PCB
https://www.muffwiggler.com/forum/viewt ... 93#3118393
https://www.muffwiggler.com/forum/viewt ... highlight=

Post Reply

Return to “Music Tech DIY”