Re: power mod C7 C8

by evostars on Wed May 30, 2012 4:07 pm

aminoacid wrote:just did it with a multiturn 5k pot.

i dont know whats happening more than cutofff is increasing...

but i liked having the voltage a bit higher how ever.


also i tried two different ac adaptors and seemd to prefer one of them...

i feel a bit like a bull shiter :)

so its not really worth it I guess...
evostars
 
Posts: 110
Joined: Sun May 13, 2012 7:35 pm

Re: power mod C7 C8

by aminoacid on Fri Jun 01, 2012 11:00 am

i wanna look at the vco on a scope before saying what i think.

but i ended up having the 12V a bit higher rather than lower.

let us know more about your moding!!!
my machines kills fascists!
aminoacid
 
Posts: 339
Joined: Tue Jun 20, 2006 4:27 am
Location: acidburg

Re: power mod C7 C8

by evostars on Fri Jun 01, 2012 11:16 am

aminoacid wrote:i wanna look at the vco on a scope before saying what i think.

but i ended up having the 12V a bit higher rather than lower.

let us know more about your moding!!!

Will do!
Im building the vcf now...
evostars
 
Posts: 110
Joined: Sun May 13, 2012 7:35 pm

Re: power mod C7 C8

by evostars on Wed Jun 13, 2012 7:30 pm

Synth is build, but I'm waiting on the bootloader for my CPU, still no firmware...
then I can proceed.

I'm also thinking of putting a 14,4V zener on the power line (composed of a 6,2 and 8,2V zener).
evostars
 
Posts: 110
Joined: Sun May 13, 2012 7:35 pm

Re: power mod C7 C8

by evostars on Sat Jun 23, 2012 6:45 pm

Got it running!

I tweaked the 12 volts with a trimpot to 12.00V exact.

Got some mods to do, and then ill also will be destabelising the power.
The plan now is to change some caps to lower values, and put some zeners in. And maybe a trimpot to limit the current.

More soon...
evostars
 
Posts: 110
Joined: Sun May 13, 2012 7:35 pm

Re: power mod C7 C8

by aminoacid on Sun Sep 02, 2012 6:46 am

hi.

i just had my xox in my workshop and switched filmcaps in the vcf for the 5th time...

while i was close to my scope i checked the output of the vco while i trimmed the 12v.

the only thing happening there was that the amplitude changed. its hard to tell if/how the overall sound changes with this...


i wanna experiment with the psu aswell further on. my ml303 has an additional regulator to feed the opamp with the correct voltage. and that machine behaves different to my xox. although it has ba662 while my xox has the 6110, but i dont think thats the issue.
my machines kills fascists!
aminoacid
 
Posts: 339
Joined: Tue Jun 20, 2006 4:27 am
Location: acidburg

Re: power mod C7 C8

by evostars on Fri Sep 07, 2012 10:02 am

aminoacid wrote:the only thing happening there was that the amplitude changed. its hard to tell if/how the overall sound changes with this...


i wanna experiment with the psu aswell further on. my ml303 has an additional regulator to feed the opamp with the correct voltage. and that machine behaves different to my xox. although it has ba662 while my xox has the 6110, but i dont think thats the issue.

I think the voltage isnt the thing to change but more so, he supply of current. And the voltage drop due to the lack of current.
evostars
 
Posts: 110
Joined: Sun May 13, 2012 7:35 pm

Re: power mod C7 C8

by aminoacid on Mon Sep 10, 2012 2:08 pm

Im hoping to hear about your psu mod real soon!

Im looking for an ac adapter with lower voltage so i Can get closer to the original supply voltage of the opamp. Also would like to insert a zener+diode in some way like in the 303.
my machines kills fascists!
aminoacid
 
Posts: 339
Joined: Tue Jun 20, 2006 4:27 am
Location: acidburg