3rd run for Thomas Henry's 555-VCO and Controller LFO

[fonik]

hi all,

due to several requests i promised to announce another run of Circuit PCBs, frontpanel components PCBs (eurorack) and eurorack Frontpanels for Thomas Henry's latest Projects (VCO and LFO).

so here we go. i will keep orders until 26 JAN 14.
As always i won't take any money until the goods are ready for delivery.
Please, tell me exactly what you wanted/needed, i.e.
"1 complete set of VCO PCBs/Panels"
or
"2 circuit VCO PCBs
+ 1 frontpanel PCB
+ 1 euro frontpanel"
you get the idea...

don't hesitate to contact me if you are interested in a completed module(handmade for you).

for the Eurorack Frontpanels i would need at least inquiries for a minimum of 30pcs, this is where the proce break kicks in. For less than 30 frontpanels i could not keep the price.

more details about the nice 555-VCO:
http://electro-music.com/forum/topic-56038.html

more info about the awesome Controller LFO:
http://electro-music.com/forum/topic-55470.html

pricing unchanged:
each PCB (circuit or frontpanel) = 7.50 EUR (~10.-USD)
printed front panel = 10.-EUR (~13.USD)
shipping international:
1 PCB = 2.-EUR (~3.-USD)
2+ PCBs = 4.-EUR (~6.-USD)
shipping deutschland:
1 PCB = 1.-EUR, 2+ PCBs = 2.-EUR




TH DIY Modules by fonitronik, on Flickr
__________

555-VCO 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 20k. should do the job as well.

4)
Try several LM13700 for best sine. the amplitude might differ quite a bit!

5)
C4 is the timing cap. use a nice C0G/NP0 or a polysterene for better stability.

6)
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:


for troubleshooting it might be helpful to have the silkscreen:

__________

Controller LFO BUILDING NOTES:

the chart below shows how to wire the potentiometers and the jacks, if you don't use the front panel components PCB:


ATTENTION: the PCB omits diode D2. i found the trigger to be fine without it.
however, if you experience occasional double triggers, solder it in parallel to R44.

ATTENTION: the P-JFET 2N5461 comes in different pinouts!
so check the datasheet of the specific brand you use!
(thanks to rosch for this find)

and here is the silkscreen of the circuit PCB:

[StormB]

Hi
bin mit 2xLFO Platinen dabei

[bod]

2x lfo printed front panels
2x vco printed front panels

I should have ordered these the first time along with the pcb's!!

Cheers,

Bod

[scriptstyle]

^agreed

I am down for
2X VCO
1X LFO

[adnauseam]

My first eurorack purchase!

I'd take 2 of each PCB
(4x pcb = 40 USD)

and 2 of each PRINTED front panel
(4x panel = 52 USD)

Plus I'm in Canada so 6 USD shipping (perhaps more? I'll take this as open to change)

98 USD if I calculated correctly.

[adnauseam]

So after looking at the original schematics at http://electro-music.com/forum/topic-54623.html I saw that it's talking about +/-15V where as I understand Eurorack specs to be +/-12v.

Haven't yet found alternate circuit diagram and being a novice I don't yet understand what to do to adapt it for 12v

Easy to accomodate?

[AlasdairMoons]

[alangave]

Hi,

I'm for 1 circuit VCO PCBs + 1 frontpanel PCB + 1 euro frontpanel

Will be my 3rd TH module, Fonik's design!

[adnauseam]

I misunderstood there as being a PCB and the option of a front panel - printed or unprinted.

I'll take:
1 VCO - complete set
1 LFO - complete set.

Ignore my previous post

[Rivelen]

Hi,
1 x LFO PCB for me please !
Thanks.

[uriahheep]

Hello
Can you put me down for
6 x 555 VCO circuit PCBS
Thank you

[isacsen]

I'm interested in:

2 x circuit 555-VCO PCBs
2 x circuit Controller LFO PCBs

Trying to restart my modular building. This will be a nice project.

Thank you.

[piedwagtail]

4 x circuit Controller LFO PCBs

please.

Robert

[drapdap]

hello Fonik!


i'll take 8 pcb's of the 555-VCO's if that is possible, taht is 4 for me, 4 for
a friend, i build, he pays. Yes Matthias, he's more reliable than me.

should i pm you?

robert

[flyweight303]

Hi Mathias

Good to see youre doing another run.

For me please:

1 vco PCB
1 controll pcb
1 panel

4x pcb LFO

(removed 4 vco pcb's)

[shiftr]

2x circuit VCO PCB's
please

shipping to the Netherlands...

[Acilator]

For me,

2 X VCO complete (pcb's + panel)
2 X LFO Complete (pcb's + panel)


Also Shipping to the Netherlands

[ioannis taf]

Hello Matthias,
I would like,please:
2 x circuit VCO pcbs,
1 x frontpanel VCO pcb,
2 x circuit LFO pcbs,
1 x frontpanel LFO pcb.

(and if available, older pcbs)

Shipping to Greece.
Thank you,
Ioannis

[mono-poly]

I'd like 3 vco pcbs and panels
And i'd like 2 lfo pcbs and panels

[jukingeo]

3 x VCO Circuit PCB

Shipping to 11702, USA.

Thanx,

Geo

[avouts]

4 cirquit vco pcb's
and 2 adsr pcb's ( if available )

[alfonso]

arghh! am i late?

i'd take 4 OSC PCBs and 4 OSC PANELS

[piedwagtail]

Alfonso, if you are from Ferrara anything is possible
He's put the deadline back due to Chinese New Year - factory is closed- the post was updated at Muffs for 7thFeb latest orders.

Robert

[alfonso]

[fonik]