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-   -   Modding a cheap 24-position rotary switch from China (https://www.diyaudio.com/forums/parts/340472-modding-cheap-24-position-rotary-switch-china.html)

EmuMannen 21st July 2019 08:50 AM

Modding a cheap 24-position rotary switch from China
 
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Ever felt tempted to buy one of those cheap rotary switches from China to use as a base for a DIY stepped attenuator? I was and I did just to find out that the detent mechanism was way too stiff for a stepped attenuator. So I had to figure out a way to mod it into something useful with a smooth tactile feel to it. I documented the mod as a blog post if anyone else run into a similar situation:

Modding a cheap 24-position rotary switch from China

Zen Mod 21st July 2019 09:00 AM

nice little trip :)

all what you really need is applying some quality graphite based grease in detent plate holes , and some audio-approved grease (I'm using same as on detent mechanism) on contact plates ......same as drop of car engine oil on shaft

that will ease rotation , make it smooth and if you use big knob , it would feel as 1M $

OK , I'm cheating ..... I'm using it as governor for Takamisawa relays , so no signal through cheapo

ne5532 21st July 2019 09:14 AM

I bought it, except for the bad feeling, it also gives free noise.
Taiwan produces better products

EmuMannen 21st July 2019 09:15 AM

Quote:

Originally Posted by Zen Mod (https://www.diyaudio.com/forums/parts/340472-modding-cheap-24-position-rotary-switch-china-post5858613.html#post5858613)
all what you really need is applying some quality graphite based grease in detent plate holes ... that will ease rotation, make it smooth ...

It was not enough on these switches that's for sure. They where really stiff, stiff beyond anything that any lubricant alone would fix. The new springs is what makes the difference. They are now really smooth comparable to the stepped attenuator on my vintage Technics SU-8600. A big knob makes it even better but is not needed after the mod.

Zen Mod 21st July 2019 09:26 AM

Quote:

Originally Posted by EmuMannen (https://www.diyaudio.com/forums/parts/340472-modding-cheap-24-position-rotary-switch-china-post5858620.html#post5858620)
.......A big knob makes it even better but is not needed after the mod.

of course that I agree with that

:)


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