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After testing the pull up resistor, I am left wondering when I invert the inputs I do not get 0v like I was expecting. After I get my desired voltage out of my Comparator, how do I stabilize it so that I can use it on a load? Sign up or log in L2m903n up using Google.
You might want to try making your drawings easier to read, since that makes it much easier for us to follow the circuit’s dxtasheet and outs. However, when I check the output the resulting voltage is 0v. Thanks for the drawings. Comparator help LmN Ask Question. You need a lm2930n resistor. Steve G 4, 1 7 The horn is about 15 ohms. They helped a lot. Since your original question has been dealt with to your satisfaction, it’s done with.
Just for grins – since you want to learn about comparators – it might be fun to take a look at the two circuits below l2903n figure out why VOUT2 switches and VOUT1 doesn’t, even though VIN is datashet same input to both circuits. Can you describe what you mean by “invert the inputs” by editing your question, please? You’ll never get 0V out with GND equal to zero volts, no matter what, because of the saturation resistance of the comparator’s output transistor.
Also, thanks for the 10K resistor idea that got the voltage down to what I was hoping to see. My wiring diagram looks similar to this picture I created in LTspice.
I will look into your question. Left click datashdet the graphic to make it go full-screen and, by the way, here’s the LTspice circuit list l,2903n in case you want to play with the circuit s: In general, inputs come from the left and the top of the ratasheet, and outputs go out the bottom and the right, kinda like this, after adding the pullup to the comparator’s output:. Sign up using Facebook. Reading the datasheet would have quickly cleared this up, there’s even a nice “typical application” schematic.
In general, inputs come fatasheet the left and the top of the drawing, and outputs go out dstasheet bottom and the right, kinda like this, after adding the pullup to the comparator’s dstasheet Thank you for pointing this out and I will go back over the datasheet to get a better understanding of how to read it. Why is this happening. Matthew Tubbs 5 1. The LM has an open-collector output. Can anyone help me come up with ideas to try and get this working?
You need to add a pull-up resistor of about 10k between the output pin and your positive supply rail. The LM has an open collector output so it can not actively drive a positive voltage. Left click on the graphic to make it go full-screen and, by the way, here’s the LTspice circuit list just in case you want to play with the circuit s:.
Say I want to use the 12v Vout to ml2903n my horn go off on my car.
LMN Datasheet(PDF) – NXP Semiconductors, Low power dual voltage comparator
Email Required, but never shown. I looked over the datasheet for 3 days and didn’t see the typical application. Home Questions Tags Users Unanswered.