[PCB] Thomas Henry's 555-VCO, 2nd run! check PMs

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

Moderators: Joe., luketeaford, lisa, Kent

Post Reply
User avatar
fonik
Super Deluxe Wiggler
Posts: 3314
Joined: Fri Sep 19, 2008 5:54 am
Location: Germany
Contact:

[PCB] Thomas Henry's 555-VCO, 2nd run! check PMs

Post by fonik » Sat Dec 08, 2012 3:40 am

[edit 31 may 2013]
interest in more of the PCBs/front panels?

i will gather/gain interest until 14 JUN 2013 and re-order what is needed...

for the front panels i would need to order at least 30pcs, though. the price for a single front panel would be 10.-EUR/13.-USD now.
[/edit]
_________________________

i am taking orders until 19. JAN 2013, then i will order all PCBs and front panels. [edit 12 JAN 2013]

Thomas Henry recently developed and published four new circuits, and i got his permission to do PCBs for these.

I already did the LFO Controller, and the next in line is the 555-VCO.
Prototype PCBs are in and will get assembled soon.

here is the link to thomas' original post (schematics can be found there):
http://electro-music.com/forum/viewtopic.php?t=54623

I think this is an intermediate project. Not that large, but some calibration is needed, a DC coupled scope would be helpful.
no obsolete parts are used (all you had to do was match the transistors of the expo, if needed for less drift of scale).

A lot of people already indicated interest or placed pre-orders in another thread, however, to keep things more traceable i decided to create this new thread dedicated tot he 555-VCO only.

more soon (pictures, prices, dates)

the VCO should be available end of january 2013.

there will be two PCBs for this project:
i will do an actual "circuit" board (providing MTA-100 connectors for all external connections), and an optional "eurorack" front panel components PCB for those who do nto want to do all the wiring.

and this time i will offer a frontpanel (top notch quality, the same process i use for my fonitronik production modules) - price TBA.
the front panel will be 16HP, giving you enough room for comfortable wiggling (note: you will NOT be able to talk me into 14HP).

so if you wanted to express your interest do it in a way that makes perectly clear what you want, i.e.
2x circuit PCB
1x eurorack PCB
1x front panel (depending on price)


the pricing of the PCBs:
7.-EUR/10.-USD each single PCB
+ shipping
international: 2.-EUR/3.-USD (1 PCB), 4.-EUR/6.-USD (2+ PCBs)
deutschland: 1.-EUR (1 PCB), 2.-EUR (2+ PCBs)

this is the same price as for the Thomas Henry LFO Controller, and i think this is a very reasonable price...

front panel sketch:

Image

BUILDING NOTES

1)
in the original schematic of the VCO frmo thomas henry we three times a resistor R26, whereas R25 is missing completely.
so here are the values corresponding to the PCB labeling that are not covered correctly by the schematic/parts list:
R25 - 300k
R26 - 39k
R55 - 5.6k

2)
when powering from 12V:
R13 = 2k
R27 = 22k
R33 = 137k

3)
when you have a hard time finding a precision trimmer wit 25k, just use 50k. does the job as well.

4)
C4 is the timing cap. use a nice C0G/NP0 or a mica for better stability.

5)
Parts for the Control PCB
for the pots any vertical mounted 3-pin 9mm pot should do, i used alpha and alps (for the values needed refer to thomas' schematic).
for the jacks i used the PJ301-BM. there is a new high quality version available with berillium copper from
THONK (Europe)
or
ERTHENVAR (USA)

to connect the control board to the cicuit board you will need single row headers and receptables.

if you build the VCO w/o the eurorack frontpanel components PCB you will have to manually wiring it up, which is a very reliable and easy to service solution IMHO. here is a diagram showing how the MTA-100 headers refere to the components:
Image

for troubleshooting it might be helpful to have the silkscreen:
Image

Image
Last edited by fonik on Tue Jul 08, 2014 3:52 am, edited 16 times in total.
Big Boss at fonitronik.de
Tech Buddy at Random*Source/Serge

User avatar
nikmis
my last name backwards
Posts: 804
Joined: Sat Sep 04, 2010 6:40 am

Post by nikmis » Sat Dec 08, 2012 3:47 am

4 circuit pcbs please, no panels or panel pcbs. I missed out on the last run of X-4046 because of a paypal issue, but its not an issue anymore.
Last edited by nikmis on Sat Dec 08, 2012 8:29 pm, edited 1 time in total.

User avatar
aladan
Desperately Seeking Sondra
Posts: 551
Joined: Tue Feb 14, 2012 12:52 am
Location: Adelaide, Australia

Post by aladan » Sat Dec 08, 2012 3:49 am

Put me down for 4 x circuit PCBs please!
Last edited by aladan on Sat Dec 08, 2012 6:48 pm, edited 1 time in total.

User avatar
pre55ure
Super Deluxe Wiggler
Posts: 1447
Joined: Tue May 01, 2012 7:15 pm
Location: SoCal
Contact:

Post by pre55ure » Sat Dec 08, 2012 3:49 am

2 x component pcb's
2 x eurorack pcb's
2 x frontpanels
Last edited by pre55ure on Mon Feb 04, 2013 5:21 pm, edited 3 times in total.

User avatar
regenbot
Super Deluxe Wiggler
Posts: 1177
Joined: Sat Aug 21, 2010 5:59 am
Location: Finland

Post by regenbot » Sat Dec 08, 2012 3:50 am

2x circuit PCB
2x eurorack PCB
2x front panel

EDITed to reflect my interest on panel too.
Last edited by regenbot on Sun Dec 09, 2012 10:31 am, edited 2 times in total.

User avatar
mikecameron
Thread Killer
Posts: 977
Joined: Sat Nov 20, 2010 2:13 am
Location: Peoria, IL
Contact:

Post by mikecameron » Sat Dec 08, 2012 3:53 am

4x PCB
2x Euro PCB
2x Euro Panel

updated for panel.
Last edited by mikecameron on Mon Dec 10, 2012 6:25 pm, edited 1 time in total.

User avatar
demian
Wiggling with Experience
Posts: 387
Joined: Mon Aug 16, 2010 3:54 am
Location: da Lowlands

Post by demian » Sat Dec 08, 2012 3:55 am

8 pcb's
4 euro rack pcbs
4 panels
Last edited by demian on Sun Dec 30, 2012 11:41 am, edited 3 times in total.

User avatar
Revok
Ultra Wiggler
Posts: 777
Joined: Sun Jan 15, 2012 12:11 pm
Location: Phoenix

Post by Revok » Sat Dec 08, 2012 3:58 am

At least 2 circuit pcb's depending on the price. Hopefully more!
Last edited by Revok on Sat Dec 08, 2012 4:13 pm, edited 1 time in total.

User avatar
thebot
haggis wuffler
Posts: 476
Joined: Mon Jun 20, 2011 4:51 pm
Location: Edinburgh, Scotland

Post by thebot » Sat Dec 08, 2012 4:09 am

2 for me please.

Edit to clarify - 2 main pcbs for me, cheers.
Last edited by thebot on Sat Dec 08, 2012 11:49 am, edited 1 time in total.

ashleym
Veteran Wiggler
Posts: 630
Joined: Thu Oct 22, 2009 3:34 pm

Post by ashleym » Sat Dec 08, 2012 4:16 am

With your usual keen pricing and great PCB quality this is a no brainer. Put me down for two please.

I am vering towards switched octaves in stead of coarse tuning. Does anyone else think this way or will I be measuring and switching on my own...???? :despair:

User avatar
glitchpop
Fuck! Building synthesizers is art
Posts: 399
Joined: Sat Apr 28, 2012 4:52 am
Location: Melbourne

Post by glitchpop » Sat Dec 08, 2012 4:32 am

edit for clarity:

1 TH 555 VCO mega pack: (1 pcb, 1 euro pcb, 1 front panel)

please :sb:
Last edited by glitchpop on Sun Jan 13, 2013 3:43 am, edited 3 times in total.

User avatar
aladan
Desperately Seeking Sondra
Posts: 551
Joined: Tue Feb 14, 2012 12:52 am
Location: Adelaide, Australia

Post by aladan » Sat Dec 08, 2012 5:22 am

ashleym wrote:With your usual keen pricing and great PCB quality this is a no brainer. Put me down for two please.

I am vering towards switched octaves in stead of coarse tuning. Does anyone else think this way or will I be measuring and switching on my own...???? :despair:
I am leaning towards a fully modular approach, with a couple of Octave/Note CV generators planned that I can use on any oscillator. I'm completely with you in spirit though - the octave switches on my System-100m and Doepfer VCOs are very useful.

User avatar
logicgate
Super Deluxe Wiggler
Posts: 1466
Joined: Wed May 30, 2012 11:43 am
Location: Fillory

Post by logicgate » Sat Dec 08, 2012 5:32 am

2 for me, please!

User avatar
ejr27233
Common Wiggler
Posts: 127
Joined: Tue Nov 01, 2011 4:56 am

Post by ejr27233 » Sat Dec 08, 2012 6:33 am

2 main circuit PCB's for me please.
Last edited by ejr27233 on Sun Dec 09, 2012 4:40 am, edited 1 time in total.

Pseudo
Learning to Wiggle
Posts: 10
Joined: Sat Dec 08, 2012 5:52 am

Post by Pseudo » Sat Dec 08, 2012 6:43 am

2 x circuit pcbs for me, please.
Last edited by Pseudo on Thu Dec 13, 2012 1:02 pm, edited 2 times in total.

marvkaye
Wiggling with Experience
Posts: 341
Joined: Sat Feb 04, 2012 1:41 am
Location: Florida

Post by marvkaye » Sat Dec 08, 2012 6:49 am

2 circuit PCBs only for me as well, please.

[edited for clarity]
Last edited by marvkaye on Mon Dec 10, 2012 6:10 pm, edited 1 time in total.

User avatar
Rigo
Chief Spam Killer
Posts: 2563
Joined: Mon Dec 27, 2010 4:48 am
Location: Belgium

Post by Rigo » Sat Dec 08, 2012 7:08 am

ashleym wrote:With your usual keen pricing and great PCB quality this is a no brainer. Put me down for two please.

I am vering towards switched octaves in stead of coarse tuning. Does anyone else think this way or will I be measuring and switching on my own...???? :despair:
There still is something like the Doepfer A-185-2 ...

On topic, if I manage to build the random looping sequencer kits I bought, maybe I might try to build a VCO as well. Though at the moment I'd prefer a kit, not having a shedload of common components at home.
Maybe I should look around for a basic package with components somewhere ...

User avatar
fonik
Super Deluxe Wiggler
Posts: 3314
Joined: Fri Sep 19, 2008 5:54 am
Location: Germany
Contact:

Post by fonik » Sat Dec 08, 2012 7:08 am

i added some info to the first post.

as for the Thomas Henry Controller LFO there will be TWO boards:
one for the circuit, providing MTA-100 header footprints for all external connections,
and one for PCB mounted front panel components in eurorack format.

and then i will offer a front panel.

so if you indicate interest here, please state what exactly you want/need.
Big Boss at fonitronik.de
Tech Buddy at Random*Source/Serge

User avatar
fonik
Super Deluxe Wiggler
Posts: 3314
Joined: Fri Sep 19, 2008 5:54 am
Location: Germany
Contact:

Post by fonik » Sat Dec 08, 2012 7:10 am

ashleym wrote:I am vering towards switched octaves in stead of coarse tuning. Does anyone else think this way or will I be measuring and switching on my own...???? :despair:
i will not modify thomas circuit. i will offer PCBs just for his circuit design, and you will have to use his schematics to build this.
Big Boss at fonitronik.de
Tech Buddy at Random*Source/Serge

User avatar
oberkorn
Veteran Wiggler
Posts: 611
Joined: Tue Jan 18, 2011 6:30 am
Location: in the EU

Post by oberkorn » Sat Dec 08, 2012 7:13 am

I'll take 2. thanks
this blank space left intentionally

User avatar
dave_3283
Learning to Wiggle
Posts: 24
Joined: Thu Oct 11, 2012 7:22 am
Location: Oak Cliff, Texas

Post by dave_3283 » Sat Dec 08, 2012 7:31 am

4 PCBs only, bitte!
Last edited by dave_3283 on Mon Dec 10, 2012 5:46 pm, edited 2 times in total.

User avatar
ringstone
antipodean experimentalist
Posts: 2789
Joined: Wed Mar 17, 2010 4:31 am
Location: Trudging through the Capital Wasteland

Post by ringstone » Sat Dec 08, 2012 7:31 am

4 circuit PCBs
4 panel PCBs
4 front panels

for me please.

Cheers
Blair
Last edited by ringstone on Sun Dec 09, 2012 5:29 am, edited 1 time in total.

Boofin Moonrocks
Common Wiggler
Posts: 105
Joined: Tue Mar 20, 2012 8:56 pm

Post by Boofin Moonrocks » Sat Dec 08, 2012 7:37 am

I'd like 2 circuit boards only. Thanks!

User avatar
Willzyx
Common Wiggler
Posts: 126
Joined: Mon Jul 18, 2011 12:58 am
Location: Taiwan

Post by Willzyx » Sat Dec 08, 2012 8:12 am

Put me down for 6 circuit PCBs


Looks like 15-25 bucks in components pre VCO what a killer design!
Last edited by Willzyx on Sat Dec 22, 2012 9:02 am, edited 1 time in total.

User avatar
knob_alchemist
Common Wiggler
Posts: 236
Joined: Sun Jan 22, 2012 3:18 pm
Location: Bolzano, Italy

Post by knob_alchemist » Sat Dec 08, 2012 8:27 am

Interested in 1 PCB, 1 front PCB, 1 front panel...

Post Reply

Return to “Music Tech DIY”