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Modding a cheap 24-position rotary switch from China
Modding a cheap 24-position rotary switch from China
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Old 21st July 2019, 08:50 AM   #1
EmuMannen is offline EmuMannen  Sweden
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Default Modding a cheap 24-position rotary switch from China

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
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Old 21st July 2019, 09:00 AM   #2
Zen Mod is offline Zen Mod  Serbia
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Modding a cheap 24-position rotary switch from China
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
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Old 21st July 2019, 09:14 AM   #3
ne5532 is offline ne5532  China
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I bought it, except for the bad feeling, it also gives free noise.
Taiwan produces better products

Last edited by ne5532; 21st July 2019 at 09:18 AM.
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Old 21st July 2019, 09:15 AM   #4
EmuMannen is offline EmuMannen  Sweden
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Quote:
Originally Posted by Zen Mod View Post
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.
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Old 21st July 2019, 09:26 AM   #5
Zen Mod is offline Zen Mod  Serbia
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Modding a cheap 24-position rotary switch from China
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Originally Posted by EmuMannen View Post
.......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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