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Help please - bespoke radio controlled model

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robertjs9

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Help please

I am building a bespoke radio controlled model... it used a 3 phase ducted fan ac motor and to control this it has an electronic speed control which is sent control via the reciever.

I know that the reciever gives square waves to the esc and then the esc proportionaly sends the correct voltage to the motor.
I want to replace the radio control with a simple switch that gives me full power for a set time.

What I would love some help with is a timer circuit that will give me 1-60 seconds full on then off at a preset time 20 sec ideal. my pob is how do I get the square waves generated at a set timed output.

I have only limited electronics knowledge and would love some help in implementing this onto an esc. I have 3 wires white (sig) black (-) and red (6v +dc)

Thank you for your time in advance
 

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