ARP odyssey mystery filter..? with p**n images

[sam]

I got hold of a non working odyssey...It has a lot of mods on it but the filter has been replaced.

It is on it's own board (blue color) with 2 3080's and 741's ect.

Any thoughts...I will try to post photo's..

[Zamise]

You have to pull one of the main boards out, the one with the filter on it, and turn the sucker over and look to see what actual filter you've got in the Oddy. They'll usually say what they are on the filter, but have to pull the board out turn it over and look at it, otherwise, I wouldn't trust what filter anyone says they have in one. It is the only way to be 100% sure in my opinion.

[sam]

The original filter has been removed and replaced with a pcb which is to the left of the original.
There is nothing on the board to identify it, Only that it's BLUE...

I guess it's a mod that you either have seen or not..I must post photo's.

Anyway the problem is in the filter and more info on this clone will help me..

[schmidtc]

Definitely haven't seen this before. Is it perfboard or a PCB? I can't really imagine how it could use the 741 without it sounding somewhat muddy. The slew rate on those op amps is aweful and would kill the high end. Then again some people like that sound and your odyssey might sound a bit more like your sonic six

[sam]

Ha...Or obx for that matter...The board is a proper pcb and looks commercial.

[nathanscribe]

So where are these photos then? Come on.

[sam]

I will post photo's but i am confused about posting them....

Call me stupid but i need to know..

The best size and how to post..?

[nathanscribe]

Use image tags containing the address of the image file:

Code: Select all

[img]http://www...[/img]

It should resize things anyway, so as long as they're big enough to see detail, and not so enormous they take forever for load, you're good to go.

If you need an image hosting site, try something like Photobucket.

[rhino]

Just wondering: could this be it?

http://www.arptech.synth.net/40235/40235.pdf

[garranimal]

great rhino! Now there's something else I absolutely HAVE to build.

[sam]

http://s748.photobucket.com/albums/xx13 ... G_1005.jpg

[schmidtc]

COOL.

[garranimal]

The silkscreen style smacks of an Elektor VCO board I spotted on matrixsynth.
I couldn't find any VCF pics.


Your photos also reminds me of my circuit boards, er, that a hobbyist builder put it together.

[shaft9000]

those potted ARP filter modules tend to die. My 2600's 'lawsuit' filter had to be rebuilt by hand by my tech.

[Mooger5]

The silkscreen style smacks of an Elektor VCO board I spotted on matrixsynth.
I couldn't find any VCF pics.


Your photos also reminds me of my circuit boards, er, that a hobbyist builder put it together.

Spot on! The mystery filter is the Formant VCF.
Page 48: Elektor Formant Synthesiser