i have to adapt one of my circuits for my brother to use in one of his rc models.
i use the circuit thats going to be altered for him at 5v but now have to read an rx signal from an aux channel at a system voltage of 7.4v, i have already redesigned the circuit with a 5v regulator for the picaxe chip but after reading an earlier thread by marmitas and seeing suggestions about using a zener clamp i just need some advice as thats new territory for me, up until now i have never used these above 5v and after reading this thread:
http://www.picaxeforum.co.uk/showthread.php?25166-Reading-pulses-from-a-Radio-Control-receiver
i now know i need to clamp the input signal.
i have looked around and tried to find info but it still seems strange to me, im not getting the whole idea how it works and if i need to calculate correctly what rating/type the diode/resistor needs to be to keep the input signal in a tolerable voltage range given the 7.4v system setup he's running.
tony
i use the circuit thats going to be altered for him at 5v but now have to read an rx signal from an aux channel at a system voltage of 7.4v, i have already redesigned the circuit with a 5v regulator for the picaxe chip but after reading an earlier thread by marmitas and seeing suggestions about using a zener clamp i just need some advice as thats new territory for me, up until now i have never used these above 5v and after reading this thread:
http://www.picaxeforum.co.uk/showthread.php?25166-Reading-pulses-from-a-Radio-Control-receiver
i now know i need to clamp the input signal.
i have looked around and tried to find info but it still seems strange to me, im not getting the whole idea how it works and if i need to calculate correctly what rating/type the diode/resistor needs to be to keep the input signal in a tolerable voltage range given the 7.4v system setup he's running.
tony