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Re: [korgpolyex] Re: DCO2 detune PWM?

2011-07-22 by billmeirelles@uol.com.br

Put the output of you Poly 800 into a scope and you will see that your Poly will never output a square wave, looks more like a fuzzy saw wave, anyways, finding

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Re: DCO2 detune PWM?

2011-07-22 by k9k9dog

if this is being discussed, any plans to add pulse width? (to original DCO) eg: if the square is produced by a comparator, varying the input compared to will

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Re: [korgpolyex] DCO2 detune

2011-07-22 by Michael Hawkins

Gordon, I want to be able to digitally control the oscillator variation of DCO2. Digital control also might mean using a D2A or use an analog control. Or even

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Re: External Audio in Mod.

2011-07-21 by 7yash

Thanks for the info, Mike. You sure know your way around it. I totally agree about the Osc section limitations, and this is why any way where we could improve

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Re: External Audio in Mod.

2011-07-19 by 7yash

Yes, I was looking at that DCO1 FM-800 mod today in the schematics too. Basically, they re tapping into IC 4 and Pin7, with the nearby R 74. If you trace that

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Re: External Audio in Mod.

2011-07-19 by 7yash

I will definitely look into Expert Sleepers at one time. I think you mentioned getting extra LFOs and other controls like this, so this will be handy. As for

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Re: [korgpolyex] Re: External Audio in Mod.

2011-07-19 by billmeirelles@uol.com.br

Select between DCO1 or DCO2 will give you the same response as both DCOs are exactly the same, no diference between them, as for noise or external audio it can

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Re: External Audio in Mod.

2011-07-19 by 7yash

Nice. Can t wait to get the proper parts for these mods. On circuitbenders.co.uk, they have a switchable source for the FM modulation: DCO1 or DCO2 or Noise or

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Re: [korgpolyex] Re: External Audio in Mod.

2011-07-19 by billmeirelles@uol.com.br

Only if the pot value is too small, than the ground will leak and you will loose signal power, if you are using a 50k or bigger it should be ok, I do prefere B

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Re: External Audio in Mod.

2011-07-19 by 7yash

Tried the Moog Slayer pot mod with pots I had in hand. If I use a smaller pot resistance value, it s normal that I get a low range, right?

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Re: External Audio in Mod.

2011-07-18 by 7yash

Thanks for the additional info, Bill. It does makes more sense to mix another Noise source prior to using the External Audio In rather than Mix it with the

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Re: External Audio in Mod.

2011-07-18 by 7yash

Thanks Bill, I am ready to try that and also the 12/24 Db Filter mod. Then, I ll also do the Moog Slayer and FM-800 mods. Much Fun. How would one wire the

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Re: [korgpolyex] DCO2 detune

2011-07-18 by Gordon JC Pearce

On Mon, 18 Jul 2011 00:55:06 -0000 ... Not easily, but you could use a crystal oscillator with a varicap diode to pull it a few kHz. I don t know if that

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Re: battery

2011-07-18 by ackolonges

Thanks a lot for your reply Don, I ve taken out R1 and D1, and soldered in a battery. Everything works great :) I ve also added the cutoff/res and FM800 knobs

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Re: External Audio in Mod.

2011-07-18 by 7yash

It looks like C24 is the one: it the one just below the 4 yellow components on the right of the NJM2609 chip.

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Re: [korgpolyex] Re: External Audio in Mod.

2011-07-18 by billmeirelles@uol.com.br

Yes, I m sure it is, I bet it is just before pin 19, if you follow the tracks you will find it, connect the tip of your audio signal to the negative leg of the

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Re: External Audio in Mod.

2011-07-18 by 7yash

Hi Bill, Looks like wiring through a cap is the way to go. I found this existing thread. It is not easy to make full sense of it as it is:

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2.0 mm connectors in poly-800 II

2011-07-18 by Bill Tomlinson

Hi. Anybody know who the manufacture of the 2.0mm wire to board connectors? Battery leakage (the drycells) has eaten several. Looked thru Mouser, but nothing

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DCO2 detune

2011-07-18 by korgpolyex800

I am looking for some help from some of you electronics engineer types that i know are on this forum. I want to create a new detune circuit to include in the

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Re: [korgpolyex] External Audio in Mod.

2011-07-17 by billmeirelles@uol.com.br

I m not sure how I did it, I found the descripton at the forum but can t remember where, anyways I believe I took out the negative leg of the cap prior to pin

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External Audio in Mod.

2011-07-17 by 7yash

Hi all, Considering that the Osc section of the Poly-800 uses an additive form synthesis with Square waves, I thought that the next nice mod for mine would be

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RE: [korgpolyex] battery

2011-07-15 by backshall1 (dsl)

Hi Jason, If those solder pads look clean, with no traces of old solder, then you probably have one of the in between models which had solder pads added to

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battery

2011-07-15 by ackolonges

Hi, I got a hold of a poly-800 recently, and it doesn t hold patches so I figured the battery had run out. When I opened it up I found that the place where the

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Poly 800 (MK I) tuning drift

2011-07-11 by honod3k

After being on for over an hour (w/ power adapter, not batteries) my Poly went so far flat that I had to move the Tune slider all the way to the right. Soon

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