Anyone here have any experiance using the LM331 as a F/V converter?
I have it breadboarded up as per the data sheet, these are te results i got from it.
Freq Voltage out (mV) Increment
100 0.03 ............. 200 0.03 0 300 0.05 0.02 400 0.08 0.03 500 0.1 0.02 600 0.1 0 700 0.13 0.03 800 0.14 0.01 900 0.17 0.03 1000 0.18 0.01 1500 0.28 0.1 2000 0.37 0.09 2500 0.46 0.09 3000 0.55 0.09 3500 0.64 0.09 4000 0.72 0.08 4500 0.77 0.05 5000 0.84 0.07 5500 0.89 0.05 6000 0.95 0.06 6500 1.04 0.09 7000 1.13 0.09 7500 1.2 0.07 8000 1.3 0.1 8500 1.39 0.09 9000 1.5 0.11 9500 1.59 0.09 10000 1.68 0.09 10500 1.81 0.13
As you can see the output is really low, from research I have looked at it should roughly go up 1V per Hz... another weird thing is that the circuit works as above even when I turn off the power supply which makes me think something weird is going on. Any ideas?
I have it breadboarded up as per the data sheet, these are te results i got from it.
Freq Voltage out (mV) Increment
100 0.03 ............. 200 0.03 0 300 0.05 0.02 400 0.08 0.03 500 0.1 0.02 600 0.1 0 700 0.13 0.03 800 0.14 0.01 900 0.17 0.03 1000 0.18 0.01 1500 0.28 0.1 2000 0.37 0.09 2500 0.46 0.09 3000 0.55 0.09 3500 0.64 0.09 4000 0.72 0.08 4500 0.77 0.05 5000 0.84 0.07 5500 0.89 0.05 6000 0.95 0.06 6500 1.04 0.09 7000 1.13 0.09 7500 1.2 0.07 8000 1.3 0.1 8500 1.39 0.09 9000 1.5 0.11 9500 1.59 0.09 10000 1.68 0.09 10500 1.81 0.13
As you can see the output is really low, from research I have looked at it should roughly go up 1V per Hz... another weird thing is that the circuit works as above even when I turn off the power supply which makes me think something weird is going on. Any ideas?