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Old 12-22-2002, 07:15 AM   #1
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Default TANTALUM capacitors on motors

Can I use TANTALUM capacitors instead of ceramic cappacitors on older style motors.

My ESC calls for 0.1 uf caps to be used on the motor and I have some blue 35V 0.1 uf TANTALUM caos kicking around.

Is there a polarity on the TANTALUM caps ?

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Old 12-23-2002, 06:44 AM   #2
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There is a polarity issue with tantalum capacitors and they don't attenuate the unwanted noise to as high frequencies as the ceramic capacitors do.
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Old 12-23-2002, 07:05 AM   #3
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I kind of thought so. I used ceramic caps for noise suppression on appliances in the past.

I just saw so places on the web where they sell caps for RC motors and they were tantalum. Some other sites even sold 103 caps .01 uf instead of .1 uf.

I will try and locate some ceramic caps at a 0.1 uf value.
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Old 12-23-2002, 04:35 PM   #4
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Yes Tantalum are polarised and they will go bang if reversed.
They hate heat and they are very unstable.
They also work crap in high frequencies.
They dry up chemically.
Why ppl use them becasue they are small than electrolytic...

For motor stick to ceramic disc with low K characteristics...

both 103 and 104 caps are fairly standard for decoupling, most ppl favour 104 but 103 can work better for High Frequency in certain applications...
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Old 12-23-2002, 05:51 PM   #5
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Great ! I have some 103 or .01uf caps but my Tekin 420G2 ESC called for 104 caps.

I guess it should still work ?

Any comments.
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Old 12-24-2002, 08:58 AM   #6
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yes it will work but canīt guarantee whether it would be better or worst than 104 in your installation... never the less it wont harm anything as it depends of the intereference you are supressing... normally the bigger the better but over certain size then it works against you...
Tekin simply recommends the norm, thats all...
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Old 12-24-2002, 09:59 AM   #7
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I wonder what value are thos SMC (surface mount) caps found in the newer motors (like Trinity) ?
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Old 12-24-2002, 04:18 PM   #8
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They are 0.1uF (104īs)
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