I'm looking for a timing cct which will be triggered by a PWM signal (Radio Control equipment) to close a NO relay for 6 seconds or so, with the PWM signal still on, the timer and relay can reset when the signal is removed. Power input from receiver is 5-6 volts enough to drive the relay coil. I can't seem to find a cct that specifically address this requirement. I have no design aptitude, but can copy, build and test, so very reliant on any help, please, many thanks in advance

 

Something like this should work. Component values will depend on the relay type and PWM signal.
Steve G