Resonance dead

Discuss x0x construction and related issues

Moderators: altitude, adafruit_support_bill, adafruit, phono, hamburgers

Please be positive and constructive with your questions and comments.
Locked
Waffa
 
Posts: 5
Joined: Wed Apr 02, 2014 11:15 am

Resonance dead

Post by Waffa »

Thanks for reading my post!

My xoxshop.de box worked allright for over two years, but adjusting the resonance gave some extra noise. So i just desoldered the pot and replaced it by a new one. Sadly now the potmeter wont affect the resonance anymore. Checked if potmeter was soldered right and the meter itself isn't dead either (measured while fiddling the knob).

Where to start solving this?

User avatar
antto
 
Posts: 1636
Joined: Thu Apr 15, 2010 3:21 pm

Re: Resonance dead

Post by antto »

i assume you've used a potentiometer of the same kind

now, do you have resonance in the filter, or no resonance at all (or something in between)?

Waffa
 
Posts: 5
Joined: Wed Apr 02, 2014 11:15 am

Re: Resonance dead

Post by Waffa »

Thanks for your quick reply!
There is resonance, and yes I replaced it with the only right one.

User avatar
antto
 
Posts: 1636
Joined: Thu Apr 15, 2010 3:21 pm

Re: Resonance dead

Post by antto »

inspect the pins of the pot on both side of the board for anything that might be shorting two pins or so

Waffa
 
Posts: 5
Joined: Wed Apr 02, 2014 11:15 am

Re: Resonance dead

Post by Waffa »

Chckd it visually and multimeterwise, no short circuit..

User avatar
antto
 
Posts: 1636
Joined: Thu Apr 15, 2010 3:21 pm

Re: Resonance dead

Post by antto »

with the x0x power switched OFF, measure the resistance between the two outter-most pins of the resonance pot, once with the pot set to min, and once set to max

User avatar
paradigm x
 
Posts: 237
Joined: Sun Feb 07, 2010 3:49 pm

Re: Resonance dead

Post by paradigm x »

Interesting. I have a x0xshop.de x0x that does the same (resonance not working).

Ill follow this with interest.

Thanks.

User avatar
antto
 
Posts: 1636
Joined: Thu Apr 15, 2010 3:21 pm

Re: Resonance dead

Post by antto »

i'm just guessing here
since the actual wise people kinda left the forum

for more instant/realtime response, i highly recommend going to the irc channel

Waffa
 
Posts: 5
Joined: Wed Apr 02, 2014 11:15 am

Re: Resonance dead

Post by Waffa »

measured outer pins on 200 K: values: 0 and 48,8.

User avatar
antto
 
Posts: 1636
Joined: Thu Apr 15, 2010 3:21 pm

Re: Resonance dead

Post by antto »

hm.. that looks normal then

look carefully thru the VCF section, on both sides

Waffa
 
Posts: 5
Joined: Wed Apr 02, 2014 11:15 am

Re: Resonance dead

Post by Waffa »

Found the problem!~One of the pcb lines was corrupted by my barbarical desoldering skills. after dripping a small dot of solder on it, the resonance ha risen from the grave!~
Antto, thanks for the help and enjoy the weekend.

User avatar
antto
 
Posts: 1636
Joined: Thu Apr 15, 2010 3:21 pm

Re: Resonance dead

Post by antto »

nice! :mrgreen:

User avatar
paradigm x
 
Posts: 237
Joined: Sun Feb 07, 2010 3:49 pm

Re: Resonance dead

Post by paradigm x »

Thanks Waffa for confirming the problem, ill check mine when i get a moment.

:)

Locked
Please be positive and constructive with your questions and comments.

Return to “Making x0x”