PCB offer: Thomas Henry's 555-VCO

fonik · Last edited by fonik on Fri Apr 25, 2014 3:21 pm; edited 14 times in total

[edit]
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]

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/topic-54623.html

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 to the 555-VCO PCB offer 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 tweaking (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:
7.50 EUR/10.-USD each single PCB
10.-EUR/13.-USD front panel eurorack
+ 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...

16HP front panel sketch. the PCBs would require at least 14HP anyways:
Posted Image, might have been reduced in size. Click Image to view fullscreen.

Posted Image, might have been reduced in size. Click Image to view fullscreen.

______________

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.

6)
silkscreen for troubleshooting (if needed)

Posted Image, might have been reduced in size. Click Image to view fullscreen.

elmegil · Posted: Sat Dec 08, 2012 8:19 am Post subject:

Definitely interested in one VCO PCB.

AlasdairMoons · Joined: Dec 03, 2011 Posts: 105 Location: East-Belgium

I'm in with 2 PCB's please Smile

crashlander42 · Joined: Oct 21, 2006 Posts: 292 Location: Orlando, FL (US)

I'm up for 2!

creekree · Posted: Sat Dec 08, 2012 9:51 am Post subject:

i`ll take one

sonic · Joined: Dec 02, 2010 Posts: 106 Location: Victoria BC

2 x circuit PCBS for me please Matthias. I think I posted something in the other thread, but I just need two in total!

DES · Posted: Sat Dec 08, 2012 5:21 pm Post subject:

4 x circuit PCBs for me please. Do you have the dimensions of this board yet? I'll be putting them in a Euro format panel but will be 2 oscillators per panel...

Thanks!

donpachi · Posted: Sun Dec 09, 2012 1:42 am Post subject:

This is great news!

4 main PCBs for me, please Very Happy

fonik · Posted: Sun Dec 09, 2012 4:42 am Post subject:

boards dimensions:
4.2 x 2.7in
in each corner dia .126 holes .1in from edges

so if you wanted to mount it parallel to the frontpanel you will end up with 14HP min vor each PCB.

wotwot · Joined: Dec 09, 2012 Posts: 6 Location: Germany

just when i thought my backlog was getting smaller...

count us in for

4 circuit PCBs
2 eurorack PCBs
2 panels

please. thank you for you effort.

magneticstripper · Joined: Jan 12, 2009 Posts: 25 Location: San Francisco

4 circuit PCBs
3 eurorack PCBs
3 panels

marvkaye · Joined: Mar 14, 2011 Posts: 225 Location: Fla

4 circuit PCBs for me, please.

<marv>

diablojoy · Posted: Mon Dec 10, 2012 4:04 pm Post subject:

put me down for 4 x circuit pcb please matthias
thanks.

fonik · Posted: Wed Dec 12, 2012 6:35 am Post subject:

as announced i will do a frontpanel with 16HP. the PCBs would require at least 14HP anyways... here is a 1st sketch:

Posted Image, might have been reduced in size. Click Image to view fullscreen.

Danno Gee Ray · Joined: Sep 25, 2005 Posts: 1351 Location: Telford, PA USA

I'm in for 2.

Thanks.

fonik · Posted: Thu Dec 13, 2012 2:40 am Post subject:

hey, thank you.

you want to of what? just the circuit boards, or would you need/want the other stuff as well?

vjrex · Posted: Thu Dec 13, 2012 4:49 am Post subject:

Id like 8 curcuit pcbs please

raoulblues · Joined: Oct 31, 2007 Posts: 16 Location: paris france

3x circuit PCBs for me please

AlasdairMoons · Joined: Dec 03, 2011 Posts: 105 Location: East-Belgium

count me +2, so in total 4 circuit PCB's

fonik · Posted: Mon Dec 17, 2012 3:51 pm Post subject:

hey, this is si funny. here at electro-music.com noone is buidomg eurorack??? the guy over at muff's are crazy about euro!

honestly, i like the idea of wiring the modules! Cool

DES · Posted: Mon Dec 17, 2012 5:33 pm Post subject:

I have my own panels....they will be Euro Smile

sh0m · Joined: Dec 17, 2012 Posts: 1 Location: cheshire

hi, count me in please

2x circuit PCB
2x eurorack PCB
2x front panel (depending on price)

thanks
mick

Level5 · Joined: Feb 16, 2007 Posts: 29 Location: Germany

4x circuit PCB please

Rivelen · Posted: Wed Dec 19, 2012 12:35 am Post subject:

I'm in for 3x circuit PCB please.

bubzy · Posted: Sat Dec 22, 2012 5:58 am Post subject:

3x vco pcb only please Smile