I've been asking Jaycar, Dick Smiths, Aus, USA & UK component retailers (only because of ease of contact) for help trying to quickly switch a signal.
The circuit in question has a metal sprocket that passes a magnet/sensor which sends a pulse that relates to a speed on a digital display. It currently runs from 0hz to about 1khz, i need to speed this up to about 1mhz although anywhere from 50khz to 2mhz will do.
I have 3 wires i have the choice of switching. Switching either one will create the desired effect. one is 10vdc, one is 0vdc/earth, one is 5vdc. I've tried switching between the wires but it has no effect. I can manually touch the wires but nowhere near fast enough.
I've tried using a 12vdc motor 2khz motor controler but beacuse it sends 12vdc as it's signal it doesn't work.
It seems the sensor only registers if the SIGNAL itself is open and shut. I have 12vdc power supply available or anything i can buy from an electronics shop.
I'm a sparky so i have some reasonable knowledge about electronics, but this is beyond my understanding.
I've spent hours looking up mosfet's, capacitors, diodes etc. Even though maybe converting the signal from dv to ac to give me the pulse i need but i've hit a brick wall.
Any advice would be greatly appreciated as it's driving me nuts lol. i don't know the current available to me but i'm guessing it's reasonlable as it's a large display it powers up.
If I can measure anything to help out, just ask me and i'll do it.
Thanks guys!!!!
Paul
The circuit in question has a metal sprocket that passes a magnet/sensor which sends a pulse that relates to a speed on a digital display. It currently runs from 0hz to about 1khz, i need to speed this up to about 1mhz although anywhere from 50khz to 2mhz will do.
I have 3 wires i have the choice of switching. Switching either one will create the desired effect. one is 10vdc, one is 0vdc/earth, one is 5vdc. I've tried switching between the wires but it has no effect. I can manually touch the wires but nowhere near fast enough.
I've tried using a 12vdc motor 2khz motor controler but beacuse it sends 12vdc as it's signal it doesn't work.
It seems the sensor only registers if the SIGNAL itself is open and shut. I have 12vdc power supply available or anything i can buy from an electronics shop.
I'm a sparky so i have some reasonable knowledge about electronics, but this is beyond my understanding.
I've spent hours looking up mosfet's, capacitors, diodes etc. Even though maybe converting the signal from dv to ac to give me the pulse i need but i've hit a brick wall.
Any advice would be greatly appreciated as it's driving me nuts lol. i don't know the current available to me but i'm guessing it's reasonlable as it's a large display it powers up.
If I can measure anything to help out, just ask me and i'll do it.
Thanks guys!!!!
Paul