Hi guys.
I am new to this forum and need some help please.
I have some electronics knowlege - from 20 years ago LOL!
I have a sensor (magnetic type 2 wire) sensing from some metal "teeth" off a disc metal disc..... I have mounted the sensor in close proximity of the teeth on the disc and get a fairly clean sinewave from it - approx. 400mV peak to peak only though, with the frequency going higher as the disc speeds up. I will measure the frequency and advise.
My other electronic circuitry needs from what I can understand a 12V square wave to operate So I need advice or preferrably a circuit diagram that would use a single 12V DC power supply to convert the 400mV sinewave to a useable 12V square wave??
I have tried using an Op-Amp in the comparator configuration but for some reason this does not work....?? Maybe my circuit I pulled off the internet was not correct or I made an error building it LOL.
I am now thinking of using a VF converter( Voltage to frequency) that I saw on the internet - NJM4151. This will take a 0-10V signal on the input and generate a 12V square wave 1HZ to 10KHZ on the output.
My thoughts are to push the sinewave from the magnetic sensor through a small bridge rectifier, and then to utilise the DC voltage derived from this into the VF converter. Surely the DC voltage should rise as the AC frequency rises as the disc speed up, or would the generated DC voltage only be amplitude related - any thoughts about this??
I have tested it and the DC voltage rises - at low disc speeds the DC is around 0.04VDC, and at higher disc speeds the voltage is around 0.6mV. The result is non linear so the VF converter does not sound like it would work.
So yes a sinewave to square wave converter would be a better option
Any other suggestions would be greatly appreciated!
Thanks in advance.
Nubaroo
I am new to this forum and need some help please.
I have some electronics knowlege - from 20 years ago LOL!
I have a sensor (magnetic type 2 wire) sensing from some metal "teeth" off a disc metal disc..... I have mounted the sensor in close proximity of the teeth on the disc and get a fairly clean sinewave from it - approx. 400mV peak to peak only though, with the frequency going higher as the disc speeds up. I will measure the frequency and advise.
My other electronic circuitry needs from what I can understand a 12V square wave to operate So I need advice or preferrably a circuit diagram that would use a single 12V DC power supply to convert the 400mV sinewave to a useable 12V square wave??
I have tried using an Op-Amp in the comparator configuration but for some reason this does not work....?? Maybe my circuit I pulled off the internet was not correct or I made an error building it LOL.
I am now thinking of using a VF converter( Voltage to frequency) that I saw on the internet - NJM4151. This will take a 0-10V signal on the input and generate a 12V square wave 1HZ to 10KHZ on the output.
My thoughts are to push the sinewave from the magnetic sensor through a small bridge rectifier, and then to utilise the DC voltage derived from this into the VF converter. Surely the DC voltage should rise as the AC frequency rises as the disc speed up, or would the generated DC voltage only be amplitude related - any thoughts about this??
I have tested it and the DC voltage rises - at low disc speeds the DC is around 0.04VDC, and at higher disc speeds the voltage is around 0.6mV. The result is non linear so the VF converter does not sound like it would work.
So yes a sinewave to square wave converter would be a better option
Any other suggestions would be greatly appreciated!
Thanks in advance.
Nubaroo