ARP Odyssey MKII/III VCO - Eurorack Format

furio · Posted: Sun Aug 25, 2013 10:31 am Post subject:

My new HiFi version sounds amazing.

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elmegil · Posted: Sun Aug 25, 2013 1:21 pm Post subject:

Is the switching lug used for something else? If not, you could add a ground connection to it, was my point. Then you don't have to worry about the position of the attenuator, input will be always grounded unless there's a jack inserted.

furio · Posted: Sun Aug 25, 2013 8:16 pm Post subject:

isak · Posted: Fri Sep 06, 2013 4:36 am Post subject:

furio · Posted: Fri Sep 06, 2013 9:08 am Post subject:

isak · Posted: Fri Sep 06, 2013 11:52 am Post subject:

Thanks for the info.

I got one question about this vco..
I have a small issue with the scale.
When turning the vco on and play C2 it plays C2 but with +20 cents, after 5 min or so it stable on center of C2, any ideas why its like that?
The Tempco is between the 3906 and 3904 with thermal Gris, really don't know why it's acting like that.
Do I really need to wait for the vco to worm up?
Strange, don't you think?

Cheers.

furio · Posted: Fri Sep 06, 2013 2:52 pm Post subject:

isak · Posted: Fri Sep 06, 2013 7:18 pm Post subject:

Thanks.
I used 1% resistors in the vco, the caps are all wima polypropylene.
It's sound amazing but I have this irritating drift when turning it on.
I guess I have to live with that..haa
45 min? Its damn long to wait for play, LOL.
wander what kind of resistors ARP used in the ody synth.

paulstone · Joined: Apr 14, 2013 Posts: 23 Location: ITA

Hello guys Smile

for this VCO it is possible to use the array CA3046 instead of the CA3086 ?

the CA3046 i have to much in home , for the CA3086 is difficult to find

thx !
Paolo

isak · Posted: Wed Sep 18, 2013 9:36 am Post subject:

Hello

Yes, you can use them, they work great.

paulstone · Joined: Apr 14, 2013 Posts: 23 Location: ITA

noiselector · Joined: Mar 30, 2013 Posts: 21 Location: France

I have built a two of them but one gets a lower pitch than the other one even adjusting the freq trimmer to maximum.
Any help?

robboten · Joined: Nov 26, 2009 Posts: 36 Location: stockholm, sweden

Hi. Just built this lovely thing. Love the PCB-layout btw! It's beautiful! I use 12V euro and just read about the PW resistor mod and will use that. Otherwise everything as in first post, except 5906 instead of 5910 and 5457 instead of 5459.

Another thing thats bothering me a bit is the range of the Coarse Freq pot. Without V/O CV (keyboard) I get about 15Hz-70Hz by turning the pot. With Keyboard plugged - C2 as lowest and upwards so far as my keyboard goes. If I tune it up to have higher Hz without keyboard, the lowest note is too high with the keyboard. Is there a way to increase the Coarse freq pot range or is there anything fishy about this? Also - the coarse freq pot is in reverse. If I turn it up the freq goes down... Otherwise everything else is great. Any ideas?

furio · Posted: Tue Apr 29, 2014 2:43 am Post subject:

Odyssey's Ring Modulator: 22K, 22K, 100n, 150K, 150K, 5K6, 2N3904, 1N4148, 330K, 1N4148, 150K (back), 150K.

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mono-poly · Posted: Sat May 31, 2014 1:23 am Post subject:

Isn't the 270K resistor which is connected to VCO1 Freq trimmer suposed to connect to something?

Question

mono-poly · Posted: Sat Jun 21, 2014 12:06 pm Post subject:

anyone???

robboten · Joined: Nov 26, 2009 Posts: 36 Location: stockholm, sweden

Found my error. It was a small gap in my home made PCB, as usual. The negative Voltage didn't reach the pots. So simple, but yet so common. Now I'll just tune it again.

bamboombaps · Joined: Oct 23, 2015 Posts: 66 Location: Glasgow

may the lord forgive me for bringing this necro thread back to life, but i could really use on the of the panels if anyone has one?

supercolio · Joined: Mar 20, 2017 Posts: 1 Location: Finland

Hi! I wonder if anyone reads this thread, but can someone measure voltages from working unit, I built one and as of yet it doesn't oscillate, or make any noises as a matter of fact. I have ordered new chips so I'll try those too... Thanks!

JP8 · Joined: Mar 25, 2019 Posts: 1 Location: Amsterdam (NL)

Hi,

I got the panels and PCBs from Pusherman in the UK. I'm wondering what jacks to search for for the Ring Mod since I haven't been able to find me a BOM for this little module. I'll include a picture of the PCB I purchased.

What kind of jacks to use here? (5-pins?)

Any help would be appreciated.

Cheers,
Ricardo

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Cathmart · Joined: Mar 24, 2019 Posts: 1 Location: Sydney AUST

Hi...any help with the parts layout for the Current ARP Odyessy VCO sold on Pusherman.....it is SIGNIFICANTLY different to the pcb info here.
thanks

sorry attachment went twice....

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icnagy · Joined: Jan 29, 2017 Posts: 6 Location: Glasgow, UK

Hi Cathmart,

I think you're looking for this repo: https://github.com/PhilicityK/ARP_Odyssey_VCO