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For a better handle on what’s going on with an LM, take a a look at the data sheetparticularly at Figure 3. In general, inputs come from the left and the top of the drawing, and outputs go out the bottom and the right, kinda like this, after adding the pullup to the comparator’s output:.

Unfortunately, that ohm dahasheet I showed is more than likely causing the problem, and it should be more like 10k for an LM Sign up or log in Sign up using Google.

Comparator help (LmN) – Electrical Engineering Stack Exchange

The LM has an open-collector output. I looked over the datasheet for 3 days and didn’t see the typical application. Comparator help LmN Ask Question. After testing the pull up resistor, I am left wondering when I invert the inputs I do not get 0v like I was expecting.

By using our vatasheet, you acknowledge that you have read and dataheet our Cookie PolicyPrivacy Policyand our Terms of Service. Can you describe what you mean by “invert the inputs” by editing your question, please?


I mistakenly thought the inverted its output. Steve G 4, 1 7 The horn is about 15 ohms.

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Can anyone help me come up with ideas to try and get this working?

(PDF) LM2903N Datasheet download

They helped a lot. Post as a guest Name. Also, thanks for the 10K resistor idea that got the voltage down to what I was hoping to see.

However, when I check the output the resulting voltage is 0v. 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.

Since ml2903n original question has been dealt with to your satisfaction, it’s done with. Email Required, but never shown. Sign up using Email and Password. 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.


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Why is this happening. Dataxheet Questions Tags Users Unanswered. One more question thought please? You need a pullup resistor. I am using a LMN to learn about comparators.

LMN Datasheet(PDF) – National Semiconductor (TI)

Left click on the graphic to make it go full-screen and, by ,m2903n way, here’s the LTspice circuit list just in case you want to play with the circuit s: After I get my desired voltage out of my Comparator, how do I stabilize it so that I can use it on a load? Thank you for pointing this out and I will go back over the datasheet to get l2903n better understanding of how to read it. I will look into your datasheeet.

In general, inputs come from the left and the top of the drawing, and outputs go out the bottom and the right, kinda like this, after adding the pullup to the comparator’s output: Thanks for the drawings. If you have a new question relating to a car horn, you should ask it separately.

My wiring diagram looks similar to this picture I created in LTspice.