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New buchla 208 card 12,sound demo Bom /pcb available
MUFF WIGGLER Forum Index -> Music Tech DIY Goto page 1, 2, 3  Next [all]
Author New buchla 208 card 12,sound demo Bom /pcb available
boops
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 nanners

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.
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/boops_208_card12/boops_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/ProjectDetail.aspx?AccessID=46bb 3779c5




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
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-208-card-12-upgrade-2-mo-fx-exte rnal-co-reverb-internal
https://soundcloud.com/boops95/buchla-208-card-12-upgrade

https://soundcloud.com/boops95/buchla-208-card-12-upgrade-2-mo-alone

Phone test





https://soundcloud.com/boops95/buchla-208-card-12-upgrade-2-mo-fx-exte rnal-co-reverb-internal
https://soundcloud.com/boops95/buchla-208-card-12-upgrade

https://soundcloud.com/boops95/buchla-208-card-12-upgrade-2-mo-alone







BUILT INFOS
first notes
Check 5 times ,solder one time wink


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











LISTEN a few posts BELOW the audio test of Captanapalm
Synesthesia
Cool, i could use a card 12 replacement on my easel actually.

what is your plan for those ? will you offer them ?
fg
very interesting !!

do you have a schematic ?
thx
boops
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
boops
fg wrote:
very interesting !!

do you have a schematic ?
thx


In the future sure ,diyers will need it.
hox3d
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?
Karl71
Looks good, definitely interested x2.
sendepause
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....
boops
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?
edwinm
Separate MO direct output?? Yes!!
boops
edwinm wrote:
Separate MO direct output?? Yes!!



yes before the pot ,with a right audio level (aop)
boops
first sounds

[s]https://soundcloud.com/boops95/buchla-208-card-12-upgrade[/s]
boops
[s]https://soundcloud.com/boops95/buchla-208-card-12-upgrade-2-mo-alon e[/s]

https://soundcloud.com/boops95/buchla-208-card-12-upgrade-2-mo-alone
boops
sound to come
hox3d
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.
pathein
love to get it, any estimation on ready date or cost of the ready made one?
boops
i m waiting a quote from a pcb supplier in a few hours.i will have some to sell in 2 weeks



[s]https://soundcloud.com/boops95/buchla-208-card-12-upgrade-2-mo-fx-e xternal-co-reverb-internal[/s]

https://soundcloud.com/boops95/buchla-208-card-12-upgrade-2-mo-fx-exte rnal-co-reverb-internal
boops
News
the phone circuit is done
i will reveive some boards to sell around the 15 th
pathein
Hi boops,

just wondering any updates on the new card 12?
boops
[img][/img]
pathein wrote:
Hi boops,

just wondering any updates on the new card 12?


Arrived today
pathein
It's peanut butter jelly time!

awesome, looking forward getting it soon!
Karl71
Any news on availibility?
boops
Next days,sure.
i have to build one to test ,everything is fine.
beautyofdecay_
That's a cool upgrade!
Looking forward to hearing the results of your test.
boops
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







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