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Author Topic: RC toy car  (Read 3511 times)

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Offline slashguitarTopic starter

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RC toy car
« on: January 06, 2012, 02:06:42 pm »
Hello,
I just took apart another toy car ...  and it's the same TX-2B/RX-2B circuit found in most chinese crap http://pro-radio.ru/user/uploads/126799.pdf
one thing that keeps bugging me is the inductor on the motor wires. What's it's purpose? Is it part of a filter or snubber?
thanx
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Offline 8086

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    • Circuitology - Electronics Assembly
Re: RC toy car
« Reply #1 on: January 06, 2012, 02:33:33 pm »
I would assume EMI suppression?
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Offline firewalker

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Re: RC toy car
« Reply #2 on: January 06, 2012, 02:37:06 pm »
My guess is that it is a filter preventing interference, from the motor's brushes, affecting the circuit.

Alexander.
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Become a realist, stay a dreamer.

 

Offline SeanB

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Re: RC toy car
« Reply #3 on: December 17, 2012, 11:11:16 am »
The toroid along with the 100n ceramic on the motor terminals form a common mode choke, so that the RF noise from the brushes does not interfere much with the receiver on board. If you remove them you will find range much reduced from what it was, and the car will be prone to locking up at full speed at times.
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