Buchla 100 system diy build

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

Moderators: Kent, Joe., analogdigital, infradead, lisa, parasitk, plord, sduck

Post Reply
User avatar
APETECHNOLOGY
Wiggling with Experience
Posts: 273
Joined: Fri Oct 16, 2015 9:22 pm
Location: DETROIT
Contact:

Post by APETECHNOLOGY » Wed Apr 04, 2018 12:09 am

Dr. Sketch-n-Etch wrote:Nice work, APETECHNOLOGY -- I just wanted to say that your etched and tinned PCBs look great. I make all my own boards as well, and I use Liquid Tin
thank you for the kind words,
for tinning boards i have been using this method lately.

viewtopic.php?t=197094&highlight=

moogboy010
Common Wiggler
Posts: 92
Joined: Sat Mar 18, 2017 1:46 pm
Location: Virginia

An Easy Sequencer

Post by moogboy010 » Wed Apr 04, 2018 8:47 am

Want an easy sequencer design,this is it!Image

moogboy010
Common Wiggler
Posts: 92
Joined: Sat Mar 18, 2017 1:46 pm
Location: Virginia

4017 sequencer

Post by moogboy010 » Wed Apr 04, 2018 10:50 am

The schematic above is right out of the "Terrrence Thomas" book!No mention is made,so I
will point that out and give "due-credit"! I am seriously considering making a "discrete (Buchla-model #123 sequencer)",but I must admit that this schematic gives' me pause.It can(rather-easily) be made to mimic a "Buchla-123",without,the extra (200,or so) parts',that the 123 entails'! This would work directly from a (140 pulse generator),or a standard (555-timer) and it would all work on a (+15v./ground)system! Something to think about,for the ( DIY) people on here? The one thing that this will probably not do,is run the (slide-in lights') that the 123 uses',due to the (extra-current-consumption)? :woah:

moogboy010
Common Wiggler
Posts: 92
Joined: Sat Mar 18, 2017 1:46 pm
Location: Virginia

Touch-plate-controller

Post by moogboy010 » Wed Apr 04, 2018 11:18 am

This is the (touch-plate -controller) that I plan on building for my modular. The schematic calls for PN3566s' and PN4916s',You could probably use 2N3906s',for the PNP positions',but I suspect you would have to use (higher-current-transistors') than 2N3904s',for the PN3566 positions'.But the 2N3904s' might work(I have not (personally) tried them)?Attributed (again)to "Terrence Thomas"!Thought some of you might find this interesting? :hmm: Forgot to mention that you would have to use a J201,or 2n4339,for the "E-101".(they really don't exist,anymore,unless you are willing to pay $18 for NOS,if you can find one?)ImageImage

User avatar
APETECHNOLOGY
Wiggling with Experience
Posts: 273
Joined: Fri Oct 16, 2015 9:22 pm
Location: DETROIT
Contact:

Post by APETECHNOLOGY » Wed Apr 11, 2018 12:55 am

go moogboy010!

with one are you going to build first?

as for the (slide-in lights') that the 123 uses
you can just gut out the lamp holding bits, leaves just the plastic to house the led's.


:tu:

moogboy010
Common Wiggler
Posts: 92
Joined: Sat Mar 18, 2017 1:46 pm
Location: Virginia

Post by moogboy010 » Wed Apr 11, 2018 10:27 am

I was thinking the same thing,Apetechnology!There is a company that makes'(l.e.d.s' )into a (slide-light-fixture),so that they will slide right-into the housing!!! I think they are asking a big-buck for them?
I will probably do the touch-plate first!
The ('123') is going to be a big-project(for me,anyway)ha!
Good luck on your face-plates' and builds'!

moogboy010
Common Wiggler
Posts: 92
Joined: Sat Mar 18, 2017 1:46 pm
Location: Virginia

Regarding;144 square-wave-generator

Post by moogboy010 » Thu Apr 12, 2018 3:05 am

Hi Peake,I got the 144 to work! :banana:
I made a really (em-bare-assing )mistake.For some reason,
(Beyond my comprehension), I added the second(+15volt) trace,to the
Matched pair(TI-122) Duuuuhhh! While that is in the ( CBS schematic),obviously you found that error,years' ago!Ha! I thought you were saying to add that?
(magical thinking,on my part)!!! I tried a (J175) and that works',but when I put in the (U147),
the square-wave got "really sweet"(5cps.-20Khtz)!Amazing (smooth,hollow)sound!
I have that position(socketed),so I will try several FETs' in there and let you and others' know what I find.I have found-out one thing; The matched pair need to be high-gain.While (low-hfe-170-250) may work,I used a set of (TIS-97s'),with an hfe in the (505-range)!!!! Possibly why the (U147) is working so well?So,I guess I will have to nix the (Terrence Thomas)generator,after all.Ha!
Thanks' for all of your help and good advice! :hail:

Jarno
Super Deluxe Wiggler
Posts: 2754
Joined: Mon Nov 15, 2010 6:34 am
Location: Rosmalen, NL

Post by Jarno » Thu Apr 12, 2018 4:56 am

Do you have a corrected schematic? Would be interesting to have an annotated one which corrects the errors in the original schematic.

moogboy010
Common Wiggler
Posts: 92
Joined: Sat Mar 18, 2017 1:46 pm
Location: Virginia

Regarding 144 schematic fix

Post by moogboy010 » Thu Apr 12, 2018 7:01 am

Well,this is not very-elegant, but this is how I corrected the schematic! :lol:
I guess you could do a( white-out) and scan the original-corrected?
Cheerz!Picture file
Last edited by moogboy010 on Sun Apr 22, 2018 11:42 am, edited 1 time in total.

moogboy010
Common Wiggler
Posts: 92
Joined: Sat Mar 18, 2017 1:46 pm
Location: Virginia

Post by moogboy010 » Thu Apr 12, 2018 7:02 am

Image

moogboy010
Common Wiggler
Posts: 92
Joined: Sat Mar 18, 2017 1:46 pm
Location: Virginia

Ebolatone 144 board

Post by moogboy010 » Thu Apr 12, 2018 7:43 am

This is Peakes' board,from his Ebolatone blog.The art-work,for the Ebolatone-144,is corrected.I was the one who(rather-foolishly), added the extra traces'!
Looking at this build,you will notice that the matched-pair of (TIS-97s') are facing the same direction as the (4916s').If you are using (2N3904s') for the matched-pair,they should be facing the other way,like the( PN3565)-NPNs'.The (TIS-97s') collector and Emitter are reversed,from a (2N3904)! Both of the (U147s') are working!(amazing)! :woah: Image

Jarno
Super Deluxe Wiggler
Posts: 2754
Joined: Mon Nov 15, 2010 6:34 am
Location: Rosmalen, NL

Re: Regarding 144 schematic fix

Post by Jarno » Thu Apr 12, 2018 11:53 am

moogboy010 wrote:Well,this is not very-elegant, but this is how I corrected the schematic! :lol:
I guess you could do a( white-out) and scan the original-corrected?
Cheerz!
Picture file
I think I started capturing the schematic in Eagle, a very long time ago, let's see if I can find them.

moogboy010
Common Wiggler
Posts: 92
Joined: Sat Mar 18, 2017 1:46 pm
Location: Virginia

Post by moogboy010 » Thu Apr 12, 2018 12:12 pm

That would be of (great)help to anybody building a 144!
Thank you! :tu:

Jarno
Super Deluxe Wiggler
Posts: 2754
Joined: Mon Nov 15, 2010 6:34 am
Location: Rosmalen, NL

Post by Jarno » Thu Apr 12, 2018 1:21 pm

Image

Found it, didn't have the values in there, but added them, removed a big mistake, and shuffled some components to hopefully make it a bit better to read. Still a little bit of a mess though.
Apparently I was planning a board, the first transistor pair is BCM847bs, probably would change that, as I can no longer handsolder those.
You do not have the required permissions to view the files attached to this post.

moogboy010
Common Wiggler
Posts: 92
Joined: Sat Mar 18, 2017 1:46 pm
Location: Virginia

Post by moogboy010 » Thu Apr 12, 2018 3:34 pm

Thanks' for posting,Jarno!

Jarno
Super Deluxe Wiggler
Posts: 2754
Joined: Mon Nov 15, 2010 6:34 am
Location: Rosmalen, NL

Post by Jarno » Thu Apr 12, 2018 4:00 pm

Glad to be of service :party: Let me know if anyone spots a mistake.


Also did a layout:
Image

Right, "huge thumbnail" option in imgur is the way to go.

User avatar
Peake
I'm in ur DIY. Filling cases with Buchla
Posts: 5661
Joined: Fri Nov 07, 2008 10:00 pm
Location: Loss Angeles

Post by Peake » Thu Apr 12, 2018 10:23 pm

Good news moogboy! Yes, I built PCB 100% per the schematic and figured out that trace to +15V offset the hell out of it...

Is your 10R on the top section burned? Where the three trimpots are...

Jarno, that's awesome :eek:
I just can't help imagining that this would be better with vactrols

User avatar
APETECHNOLOGY
Wiggling with Experience
Posts: 273
Joined: Fri Oct 16, 2015 9:22 pm
Location: DETROIT
Contact:

Post by APETECHNOLOGY » Fri Apr 13, 2018 1:18 am

well done moogboy010
thank you Jarno!
and yes Peake, i wondered about that resistor earlier today as well!

:nuke:

Jarno
Super Deluxe Wiggler
Posts: 2754
Joined: Mon Nov 15, 2010 6:34 am
Location: Rosmalen, NL

Post by Jarno » Fri Apr 13, 2018 1:43 am

Image

Teachers strike today, and I can only take the kids to daycare in half an hour or so, so gave the board another spin. :)
Pots and jacks are at 0.8", and are in the same order as on the Buchla panel (so from the top down, AM, FM, frequency control). Board dimensions are 2.8" x 3".
By the way, I used 2N5116 because that was the closest part I have in the Eagle libraries, it should be 2N5020, unless someone has different experiences (is it crucial to have the right JFET there?). As mentioned I used "BC" transistors, which are reversed from 2N3904/2N3906 I believe. Not sure about the pinout of the transistors you used Peake, were they CBE or EBC or something totally different?

Jarno
Super Deluxe Wiggler
Posts: 2754
Joined: Mon Nov 15, 2010 6:34 am
Location: Rosmalen, NL

Post by Jarno » Fri Apr 13, 2018 4:55 am

By the way, if there's circuitry someone would like to add, to create extra functionality, like saw output or VC PWM, there is some room on the board. Let me know, we'll take this a bit further :)

moogboy010
Common Wiggler
Posts: 92
Joined: Sat Mar 18, 2017 1:46 pm
Location: Virginia

Post by moogboy010 » Fri Apr 13, 2018 11:15 pm

HI Peake,
I'm working on the 158A.I etched and drilled the board,today.
Have started to populate with resistors',then other components'!
Yeah,that damn-trace that I added ,on the 144,took me forever to figure-out!Ha! Duh!
I think I realized,when I built the 140,that the oscillator section worked so easy!Ha!
Anyway,the 144 sounds' great.I have to finish attaching the switch and modulation-pots'.
That 10 ohm got hot,yes! I installedan fet(wrong) a while back.Did not fry the fet,,or the 10ohm,but they got very warm! :woah:

User avatar
Peake
I'm in ur DIY. Filling cases with Buchla
Posts: 5661
Joined: Fri Nov 07, 2008 10:00 pm
Location: Loss Angeles

Post by Peake » Sat Apr 14, 2018 11:54 am

Jarno, Pre55ure earlier posted about a FET which works fine, hope he chimes in.

The original transistors Buchla used had CBE pinouts with dome-shaped bodies, forget the case style name. I used modern PN versions with EBC pinouts excepting the 3391A which is ECB.

ImageBuchla 144 1D3b Etch and Parts by mpeake, on Flickr[/img]

The reason the latest version has a large ground plane between the oscillator pair is that I experienced some phase locking at unison tunings.
I just can't help imagining that this would be better with vactrols

Jarno
Super Deluxe Wiggler
Posts: 2754
Joined: Mon Nov 15, 2010 6:34 am
Location: Rosmalen, NL

Post by Jarno » Sat Apr 14, 2018 1:14 pm

Thanks Mike,

I did see the mentioning of the 2N5460, but the other P-channel FET has a bigger case, so I am assuming that if the bigger (older) FET fits the other one will as well.
Need to do a bit more studying on the 2n3391a, I mean flipping a transistor is easy enough, but that footprint is quite different, ECB, bonkers.

User avatar
j450nn014n
Common Wiggler
Posts: 216
Joined: Fri Apr 13, 2018 7:13 am
Location: Toronto
Contact:

Re: 165 random generator

Post by j450nn014n » Sat Apr 14, 2018 5:24 pm

[quote="fluxmonkey"]as peake mentioned, a number of folks (including myself) have used the random generator based on the easel design for work-alikes. it is pseudo-random, based on recirculating shift registers, PCB available here: http://fluxmonkey.com/fluxmerch_gear.htm

Thanks for pointing me to your stuff. I was just about to ask if anyone had boards available. We have a circuit mill, but I refuse to touch it, and I've always sent my boards out to be made (nothing this complex) and you have to get 10+ which I don't need. Happy to purchase off someone who's done the heavy lifting.
Autistic. I like making noises at my workplace. I usually end up breaking something.

User avatar
Peake
I'm in ur DIY. Filling cases with Buchla
Posts: 5661
Joined: Fri Nov 07, 2008 10:00 pm
Location: Loss Angeles

Post by Peake » Sun Apr 15, 2018 12:39 pm

I believe ECB is standard Japanese transistor pinout, or at least is common. BASS!

Image
I just can't help imagining that this would be better with vactrols

Post Reply

Return to “Music Tech DIY”