[ORDER] ARP Odyssey Mk II/III VCO PCBs/Panels

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tuanuibi
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Post by tuanuibi » Tue Sep 18, 2012 10:18 am

2 x VCO boards for me please sir!
ourdia.bandcamp.com
dearplastic.bandcamp.com
buriedfeather.bandcamp.com

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nickster
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Post by nickster » Sun Sep 23, 2012 7:11 am

Mine arrived this week ! Thanks Rick
:goo: :banana:

Pcp
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Post by Pcp » Sun Sep 23, 2012 7:33 pm

Just paid for 2 VCO boards
thanks for making these available

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mckenic
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Post by mckenic » Mon Sep 24, 2012 10:49 am

Thanks for this mate!

Finally sent payment - apologies for the delay!

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mOBiTh
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Post by mOBiTh » Mon Sep 24, 2012 5:10 pm

Paid for mine finally - 2xVCO 1xPanel + bits

Cheers!

M

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Juxwl
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Post by Juxwl » Tue Oct 02, 2012 4:07 pm

brother303 wrote:Hi,
frequencycentral wrote:I'm going to socket the trannies and see if they can be viably subbed with something more common.
as far as I can remember they can be substituted with 2N3906.

I found my 2N5910 on ebay some time ago...

Cheers
Greg
Has anyone verified whether a 2N3906 will work? Is it oriented in the pcb the same way?

isak
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Post by isak » Tue Oct 02, 2012 5:01 pm

From electro-music post of the Arp odyssey MKII/III
For the 2N5459 I originally used BF245 (the pinout is reversed), then changed for the 2N5459, I didn't note any difference.

For the 2N5910 I used 2N3906.

Also I used 2K tempcos.

Hope this help.
this is the full page:
http://electro-music.com/forum/viewtopi ... &start=300

it works 8_)

pdman
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Post by pdman » Wed Oct 31, 2012 9:02 am

Just joined here via electro-music forum.
Are these PCBs still available for sale?
Please let me know.
Thanks
pd

pdman
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Post by pdman » Wed Oct 31, 2012 9:11 am

OK looks like I can order but do I go with the present exchange rate for £15 GBP? Do I pay in American dollars or GBP?
Thanks

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frequencycentral
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Post by frequencycentral » Wed Oct 31, 2012 9:31 am

PM'ed

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frequencycentral
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Post by frequencycentral » Sun Nov 04, 2012 9:52 am

Ok, this week I finally got my ARP VCOs panelled up, really enjoying them.

But.....I made an error on the RM documentation, the 2 x 2.2K resistors should actually be 2 x 22K resistors. I noticed that my RM was really quiet, so did some research and found my error. Oooops.

I normalised VCO2's 1V/oct CV in to VCO1's 1V/oct CV in - saves a patchcord!. Also normalised the CV2 inputs to ground, as they are floating and affect the tuning when not in use.

Anyways here's mine:

Image

Image

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Juxwl
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Post by Juxwl » Fri Jan 04, 2013 10:31 pm

Will LM3046 work for the CA3086?

Also, how is the sync switch wired up?
Bottom lug - osc. 1/sync out
Middle lug - osc. 2/ top right corner (left of uppermost 150k resistor)
Top lug - osc. 2/right of junction of 150k and 100k resistor (directly below uppermost 150k resistor)?

Edited for clarity
Last edited by Juxwl on Sun Jan 06, 2013 11:54 pm, edited 1 time in total.

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raisinbag
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Post by raisinbag » Fri Jan 04, 2013 10:47 pm

I remember reading somewhere that 3046 is a drop in for 3086. I think it might have been bride chamber's store?

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Juxwl
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Post by Juxwl » Fri Jan 04, 2013 11:00 pm

raisinbag wrote:I remember reading somewhere that 3046 is a drop in for 3086. I think it might have been bride chamber's store?
That's where I read it, too. I'm wondering about the "LM"3046. I read this oscillator requires the "CD" variety of the 4011 and won't work with other prefixes. Has anyone built a working one with the LM3046?

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steffensen
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Post by steffensen » Sat Jan 05, 2013 5:30 am

It works with CA3046 (ive tried), cant say about the LM. Try it and find out. :)

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frequencycentral
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Post by frequencycentral » Sat Jan 05, 2013 5:42 am

Juxwl wrote:Will LM3046 work for the CA3086?
My guess is yes. CA3046 works, can't see why LM3046 wouldn't too.
Juxwl wrote:how is the sync switch wired up?
Bottom lug-sync out/osc. 1, middle lug-top right corner of osc. 2(left of uppermost 150k resistor), top lug-right of junction of 150k and 100k resistor (directly below uppermost 150k resistor)?
That's 100% correct.

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filterstein
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Post by filterstein » Sat Jan 05, 2013 11:35 am

You can exchange CA for LM in general, it is a rebrand of the same manufacturer. For example CA3080 = LM3080

The only substitute that I know of for CD range is the HEF range that used to be made by Philips.

CD4011 is HEF4011. In the Netherlands HEF was what you got in the local stores and I never had a chip that did not work when it needed to be CD.

isak
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Post by isak » Sat Jan 05, 2013 11:52 am

I use CA3046 and HEF4011, works great.
In addition no need to break your mind on getting the 5910 transistor, the 3906 is working great instead.

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aL Pariah
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Post by aL Pariah » Sun Jan 06, 2013 12:41 am

What is the switch I need to get, please?

An SPDT on-off?

isak
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Post by isak » Sun Jan 06, 2013 2:09 am

I assume your talking about the synch switch.
You will need a switched jack.

Cheers.

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frequencycentral
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Post by frequencycentral » Sun Jan 06, 2013 5:09 am

aL Pariah wrote:What is the switch I need to get, please?

An SPDT on-off?
You need an SPDT, wired as outlined a few posts up.

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reggiechacha
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Post by reggiechacha » Sun Jan 06, 2013 4:14 pm

I've been trouble shooting this project for a few hours now. I'm not getting any output, and my scope isn't showing any wave shapes. There are low voltages on the saw out put of about 0.7v and nothing from the square output. When I add a LFO in to the CV2 input you can here the pulse/click.
I"ve built this using mostly 3906 and 3904 but I do have one 5910 in one of the boards.
I'm using HCF4011 and have tried both CA3046 and the CA3086. These are voltages I get on one board for each pin of the CA3086:
1 = 11.33V
2 = 11.22V
3 = 10.48V
4 = 3.74V
5 = 12.06V
6 = 6.30V
7 = 11.32V
8 = 11.68V
9 = 12.08V
10 = 11.39V
11 = 12.05V
12 = 0
13 = -0.65
14 = 4.83V

The 2nd 3046 on vco2 gives out the same except pins 7 = 7.54v, 9 = 8.15v and 9 = 7.55v.
I've checked all the resistors and caps and the orientation of the transistors. I've checked continuity especially around dry looking solder joints and have also ran my iron over them just in case. So basically I'm at a loss as to why neither board works.
Any suggestions are much appreciated!
Cheers
Andy

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steffensen
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Post by steffensen » Mon Jan 07, 2013 7:22 am

reggiechacha
I spent about 2 months troubleshooting my ARP's. I had a constant high pitch going on (from both the waveform outs), and i couldnt affect it much.
During my investigations, i learned this VCO somewhat decent, so hopefully i can help.

Im not at home to check atm, but i do remember clearly that your 3086 pin's 1-2-3 are what they are suppose to be, volt-wise that is. The 3086 is most probably working like it should.

My guess, would be the 4011. Not sure HCF works or not, seen some reports on them failing in some various ARP builds.

What solved my issues tho, was that i needed to replace my 3904's. Seems they were bad fakes, as my 3906's too i guess. But it was enough replacing the 04's in my case. So, if the change of the 4011 doesnt work out, i would check up on the trannies.

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reggiechacha
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Post by reggiechacha » Mon Jan 07, 2013 9:14 am

Steffensen
Thanks for your reply, especially in regards to the chip. Good to know it's probably ok.

I think I read your posts in the EM forum regarding the 3904 transistors, so I checked mine as I had bought a batch from a new seller. When I compared them to those bought from a reliable source the hFE output was much lower (from memory they were around 130) so I replaced them with the more reliable ones (hFE around 190).
I think i'll check to voltage on the transistors when in operation and see if there's a problem.

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reggiechacha
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Post by reggiechacha » Mon Jan 07, 2013 6:17 pm

I measured the voltage outs for the 3906 and 3904 (+5019).
VCO1
Where the 3906 and 3904 are paired I got:
3906 - E=0.5ma B=-0.14v c=0.6ma (E quite different to VCO2 see below)
3904 - E=0.6ma B=0.5ma C=1.47v (B quite different to VCO2 see below)
The other 3906 was E=11.10v B=10.48v C=0.59v
The other 3904 was E=11.36v B=11.8v C=12.06v
In this VCO I also used a 3906 in place of the 5920. E=12.06v B=11.38v C=12.02v

VCO2
Where the 3906 and 3904 are paired I got:
3906 - E=0.54v b=0.06v C=0.7ma
3904 - E=0.7ma B=0.54v C=0.65v
The other 3906 was E11.8v B=10.46v C=0.59v
THe other 3904 was E=11.34v B=11.83v C=12.07v
I used a 5910 on this VCO which gave me E=12.07v B=11.32v C=12.03v

I've also measured the HCF4011
VCO1 and 2 are more or less the same.
1 = 12v
2 = 7.27v
3 = 0
4 = 12v
5 = 0
6 = 0
7 = 0
8 = 0
9 = 0
10 = 12v
11 = 12v
12 =0
13 = 0
14 = 12v

Any comparison or suggestions welcome.

Cheers
Andy

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