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Help repairing DIY Cascade mixer module
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aerogramma



Joined: Feb 27, 2008
Posts: 156
Location: Roma, Italy - London, UK
Audio files: 13

PostPosted: Thu May 05, 2022 12:32 pm    Post subject: Help repairing DIY Cascade mixer module Reply with quote  Mark this post and the followings unread

Hello!
After many years of great service I'm starting having trouble with my DIY Fonitronik Cascade.
It pick ups noise from the system (eg. you can hear vcos from the soundcloud link) and it's generally noisy even on its own.

I've put up a sample here:

https://soundcloud.com/valeriolab/cascade-noise/s-7vKdwOajL25?utm_source=clipboard&utm_medium=text&utm_campaign=social_sharing

It starts with the knobs at 12.00 o'clock. Moving the knobs clockwise or c/clockwise produces different resulting noise and sometimes silence (also in the sample below).

Any suggestion on how to fix it? It's a great mixer.

Thanks!
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Sven



Joined: Mar 10, 2017
Posts: 48
Location: Norway

PostPosted: Sat May 07, 2022 7:56 am    Post subject: Reply with quote  Mark this post and the followings unread

Did it happen after you added some modules to your rack? Is your power supply at its limit?
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aerogramma



Joined: Feb 27, 2008
Posts: 156
Location: Roma, Italy - London, UK
Audio files: 13

PostPosted: Sat May 07, 2022 8:10 am    Post subject: Reply with quote  Mark this post and the followings unread

Sven wrote:
Did it happen after you added some modules to your rack? Is your power supply at its limit?


Thank you Sven, neither of those.
I also tried removing modules and the problem persisted, tried with another PSU same problem.
However sometimes the problem goes away for a while and then it comes back.
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DES



Joined: Feb 28, 2003
Posts: 794
Location: New Jersey
Audio files: 8

PostPosted: Sat May 14, 2022 4:36 pm    Post subject: Reply with quote  Mark this post and the followings unread

I’m not familiar with that particular mixer but what I would do is try loosening then tightening any mechanical connections like potentiometer and jack nuts, board mounting screws, to help reestablish ground connections. Also, if any of the input jacks short unused inputs to ground (presumably to keep noise out) try cleaning the jacks out and exercise them by plugging a plug in and out several times to make sure the jack switch is engaging. Jack may be failing… Does the noise persist if nothing plugged in? Could be bad electrical connection…make sure the power connections are solid. If any ICs are in sockets, remove then reinsert them to establish clean connection. The intermittent nature leads me to think its more of a mechanical problem. Or possibly temperature?
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www.davesneed.com
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aerogramma



Joined: Feb 27, 2008
Posts: 156
Location: Roma, Italy - London, UK
Audio files: 13

PostPosted: Sun May 15, 2022 1:53 am    Post subject: Reply with quote  Mark this post and the followings unread

DES wrote:
I’m not familiar with that particular mixer but what I would do is try loosening then tightening any mechanical connections like potentiometer and jack nuts, board mounting screws, to help reestablish ground connections. Also, if any of the input jacks short unused inputs to ground (presumably to keep noise out) try cleaning the jacks out and exercise them by plugging a plug in and out several times to make sure the jack switch is engaging. Jack may be failing… Does the noise persist if nothing plugged in? Could be bad electrical connection…make sure the power connections are solid. If any ICs are in sockets, remove then reinsert them to establish clean connection. The intermittent nature leads me to think its more of a mechanical problem. Or possibly temperature?


Thank you Dave! I'll try all those things out Smile
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