Hey guys, I'm building a circuit for automotive use so it'll be powered with 12-15 volts.
I need a circuit that will basically have an input, this will be a frequency from 0-8,000 pulses per second. Alright, when the frequency is above a certain rate, let's say 2,000 pulses per second, then it will open or close a circuit via relay and will hold that circuit in that state until the frequency is below 2,000 puleses again.
I'm trying to build a circuit for my electric fan, where when I'm driving over 30-35 mph it'll turn the fan off so that it can't turn back on unless I'm driving under 30-35mph. My truck's speed sensor sends out 4,000 pulses per mile, which is where I got the general frequency needed for the input.
The ouput would need to either be a ground or +voltage that will alternate between the two. I'm interest in your guys ideas, prefer inexpensive setups, but will look at all alternatives.
Also, I would like to be able to easily change at what frequency the circuit is looking for when to change.
Thanks for your help guys, I have experience with wiring and circuits, but I've never had to build this sort of a circuit before.
Phillip Chauvaux
I need a circuit that will basically have an input, this will be a frequency from 0-8,000 pulses per second. Alright, when the frequency is above a certain rate, let's say 2,000 pulses per second, then it will open or close a circuit via relay and will hold that circuit in that state until the frequency is below 2,000 puleses again.
I'm trying to build a circuit for my electric fan, where when I'm driving over 30-35 mph it'll turn the fan off so that it can't turn back on unless I'm driving under 30-35mph. My truck's speed sensor sends out 4,000 pulses per mile, which is where I got the general frequency needed for the input.
The ouput would need to either be a ground or +voltage that will alternate between the two. I'm interest in your guys ideas, prefer inexpensive setups, but will look at all alternatives.
Also, I would like to be able to easily change at what frequency the circuit is looking for when to change.
Thanks for your help guys, I have experience with wiring and circuits, but I've never had to build this sort of a circuit before.
Phillip Chauvaux