| Author |
Message |
Steve N. (N4rsn)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, June 23, 2006 - 2:12 pm: | |
I have a question. Is the pick-up unit for a speedometer, or a tachometer, just a Proximity Switch???? If it is, is it a magnetic, capacitave, inductive, or what ever else is out there. I know a Proximity Switch, is a whole lot cheaper than a pick-up unit, with a name on it, from an instrument company. Or am I all wet in my thinnin
thanks
Steve |
jimmci9 #2
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, June 23, 2006 - 2:23 pm: | |
all of the electronic tachometers ive seen use a magnetic pickup... call it a speed generator, pulse generator or a magnetic pickup, it all does the same thing... it creates a small a/c voltage signal that the tach head interpets into a useable signal... |
Gary Stadler (Boogiethecat)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, June 23, 2006 - 5:18 pm: | |
They are usually either a simple coil of wire wrapped around a small magnet (if they are the type that looks at flywheel or gear teeth) or if they have a rotating shaft and a few wires, ie they plug into the tranny and connect to gears rather than just being near one, then they are likely a hall effect device that requires 12 volts and puts out pulses.
Another way to look at it, is if they have two wires they are probably a simple coil. If they have three they are probably hall effect.
Some of the cheesy speedometer pickups that look at magnets stuck to driveshafts or wheels may actually have reed switches in them....
Cheers
(Message edited by boogiethecat on June 23, 2006) |
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