Korg Poly800/EX800 Users

this is about adding a input to the poly800

I just was hoping someone would bounce some info back to me.  how is 
an IC numbered. i have uploaded a picture of IC1 named NMJ2069.jpg 
with how i think its numbered. if someone could tell me if i was 
right or wrong. that would be great.  just kinda wanted some 
feedback before i started cutting wires.  anyway...i was also 
thinking for the input i would need to put in a pot to limit signal 
coming in. any ideas?

your probably going to want to do moare than just wire a lead to it and put a potentiometer on it. You probably want to think about getting the impedance right for an input. Also a decoupling capacitor or transformer can help too. IMHO that wiring an input stright to the chip that was never meant to see an outside elctricl signal might just end up damaging the chip from plugging and unplugging the cable to other devices. 

theagreemen <theagreemen@...> wrote:
this is about adding a input to the poly800

I just was hoping someone would bounce some info back to me.  how is 
an IC numbered. i have uploaded a picture of IC1 named NMJ2069.jpg 
with how i think its numbered. if someone could tell me if i was 
right or wrong. that would be great.  just kinda wanted some 
feedback before i started cutting wires.  anyway...i was also 
thinking for the input i would need to put in a pot to limit signal 
coming in. any ideas?





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I'll agree that you might want to provide some way of isolating your 
input for the protection of this IC.

It's hard to tell from the photo, since the max resolution I can view 
it is 400x400. I think you have it correct. If the end of the IC with 
the semicircular "notch" is up, then the first pin to its left is pin 
1, then the pins are numbered sequentially counterclockwise.

Good luck

Marty



--- In korgpolyex@yahoogroups.com, russ <russdaren@y...> wrote:
> your probably going to want to do moare than just wire a lead to it 
and put a potentiometer on it. You probably want to think about 
getting the impedance right for an input. Also a decoupling capacitor 
or transformer can help too. IMHO that wiring an input stright to the 
chip that was never meant to see an outside elctricl signal might 
just end up damaging the chip from plugging and unplugging the cable 
to other devices. 
> 
> theagreemen <theagreemen@y...> wrote:
> this is about adding a input to the poly800
> 
> I just was hoping someone would bounce some info back to me.  how 
is 
> an IC numbered. i have uploaded a picture of IC1 named NMJ2069.jpg 
> with how i think its numbered. if someone could tell me if i was 
> right or wrong. that would be great.  just kinda wanted some 
> feedback before i started cutting wires.  anyway...i was also 
> thinking for the input i would need to put in a pot to limit signal 
> coming in. any ideas?
> 
> 
> 
> 
> 
> ---------------------------------
> Yahoo! Groups Links
> 
>    To visit your group on the web, go to:
> http://groups.yahoo.com/group/korgpolyex/
>   
>    To unsubscribe from this group, send an email to:
> korgpolyex-unsubscribe@yahoogroups.com
>   
>    Your use of Yahoo! Groups is subject to the Yahoo! Terms of 
Service. 

> 
> 
> 
> __________________________________________________
> Do You Yahoo!?
> Tired of spam?  Yahoo! Mail has the best spam protection around 
> http://mail.yahoo.com

i wanted to add an input so i could run my theremin through it...but now im kind of afraid of messing with it.  i had thought about some sort of limiter or something but im not exactly sure how to go about that because im not much of electronics guy. i was thinking maybe a small fixed pot that would only allow X amount of signal in but again. that was just my thought.  seems like if i really want to go for this im gonna need to pick up a volt meter.