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Sign up using Email and Password. Matthew Tubbs 5 1. I looked over the datasheet for 3 days and didn’t see the typical application. They helped a lot. I mistakenly thought the inverted its output. I am using a LMN to learn about comparators. One more question thought please?
However, when I check the output the resulting voltage is 0v. 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: Thank you for pointing this out and I will go back over the datasheet to get a better understanding of how to read it.
Can anyone help me come up with ideas to try and get this working? Post as a guest Name.
LMN Datasheet pdf – Dual Comparator – Fairchild Semiconductor
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 Sign up using Google. Thanks for the drawings. I will look into your question. Ln2903n Questions Tags Users Unanswered.
You might want to try making your drawings easier to read, since that makes it much easier for us to follow the circuit’s ins and outs. You need a pullup resistor.
Unfortunately, that ohm pullup I showed is more than likely causing the problem, and it should be more like 10k for an LM In general, inputs come from the left and the top of dxtasheet drawing, and outputs go out the bottom and the right, kinda like lm29033n, after adding the pullup to the comparator’s output: Reading the datasheet would have quickly cleared this up, there’s even a nice “typical application” schematic.
Why is this happening. For a better handle on what’s going on with an LM, take l2903n a look at the data sheetparticularly at Figure 3. 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:. 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.
LMN Datasheet(PDF) – NXP Semiconductors
After testing the pull up resistor, I am left wondering when I invert the inputs I do not get 0v like I was expecting. In general, inputs come from the left and the top of the datashheet, and outputs go out the bottom and the right, kinda like this, after adding the pullup to the comparator’s output:.
Just for grins – since you want to learn about comparators – it might be fun to take a look at the two circuits below and figure out why VOUT2 switches and VOUT1 doesn’t, even though VIN is the same input to both circuits. The LM has an open-collector output. My wiring diagram looks similar to this picture I created in LTspice.
Since your original question has been dealt with to your satisfaction, it’s done with. If you have a new question relating to a car horn, you should ask it separately. Also, thanks for the 10K resistor idea that got the voltage down to what I was hoping to see.