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This is the Spektrum voltage protector capacitor. In order to make sure your Spektrum receiver always has the correct voltage, you can use this power capacitor to smooth out the voltage to the receiver. This will help avoid spikes in the receiver battery voltage due to your servos needing large pulses of current.
Use of the power capacitor is necessary to dissipate noise and smooth voltage spikes, and will also improve the performance of these speed controls by reducing the operating temperature by 10-15° Fahrenheit.
واضح و مفيد انا دوردت في السوق الي حصلته في السوق
4700uf 10V ما ادري لو كان يكفي للغرض او لا.