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Actually f939 servo is small and it can not easily lift the flaps so I need to make receiver and I need to solder 3 servo motor so that one servo would only lift one flap and it will not burnt so please tell me how can I make receiver I have f939 channel 3 transmitter fully working please someone tell me how can I make receiver
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Use my tutorial on NRF24. Use that old transmitter, add a NRF24 module with antenna and the receiver will be an arduino and with PWM control the servo.

Link1: https://www.youtube.com/watch?v=aztm_8qGVfc&t=1s

See also: https://www.youtube.com/watch?v=t2AHs41a1cU
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