I have a radio control airplane that has electric retractable landing gear. The controller for the retracts has bit the dust. New ones are no longer available so I have to make one. Here's how it works:
It is controlled by a channel on the RC receiver. The channel uses PWM with the pulses varying from 1000 usec to 2000 usec. The pulse width is controlled by a two position toggle switch on the transmitter. In position 0 the pulse width is 1000 us. In position 1 the pulse width is 2000 us.
The wire from the receiver to the controller supplies +5 volts, ground, and the PWM signal. When the pulse width is 1000 us the controller outputs +5.0 to the retracts. When the pulse width is 2000 us the controller outputs -5.0 volts to the retracts.
I suppose a servo IC might perform that function, but I don't know, nor do I have any, or even know what part number it might be.
So, can anyone come up with a circuit that do what I need?
Thanks,
Jack
It is controlled by a channel on the RC receiver. The channel uses PWM with the pulses varying from 1000 usec to 2000 usec. The pulse width is controlled by a two position toggle switch on the transmitter. In position 0 the pulse width is 1000 us. In position 1 the pulse width is 2000 us.
The wire from the receiver to the controller supplies +5 volts, ground, and the PWM signal. When the pulse width is 1000 us the controller outputs +5.0 to the retracts. When the pulse width is 2000 us the controller outputs -5.0 volts to the retracts.
I suppose a servo IC might perform that function, but I don't know, nor do I have any, or even know what part number it might be.
So, can anyone come up with a circuit that do what I need?
Thanks,
Jack