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Sign up using Facebook. The LM has an open-collector output. Say I want to use the 12v Vout to make my horn go off on my car. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. I will look into your question.

Home Questions Tags Users Unanswered. Post as a guest Name. Since your original question has been dealt with to your satisfaction, it’s done with. 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. Comparator help LmN Ask Question. Thank you for pointing this out and I will go back over the datasheet to get a better understanding of how to read it.

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LMM vs LMN/NOPB feature comparison | Findchips

If you have a new question dahasheet to a car horn, you should ask it separately. They helped a lot. However, when I check the output the resulting voltage is 0v.

Sign up using Email and Password. 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: After testing the pull up resistor, I am left wondering when I invert the inputs I do not get 0v like I was expecting. I mistakenly thought the inverted its output. Matthew Tubbs 5 1. 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.

Sign up or log in Sign up using Google. 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.

Reading the datasheet would have quickly cleared this up, there’s even a nice “typical application” schematic. I looked dtasheet the datasheet for 3 days and didn’t see the typical application.

Email Required, but never shown. You need to add a pull-up resistor of about 10k between the output pin and your positive supply rail.

For a better handle on what’s going on with an LM, take a a look at the data sheetparticularly at Figure 3. Why is this happening.

I am using a LMN to learn about comparators. The horn is about 15 ohms. 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:.

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Dual Comparator

The LM has an open collector output so it can not actively drive a lm2903h voltage. Can anyone help me come up with ideas to try and get this working? Thanks for the drawings. Unfortunately, that ohm pullup I showed is more than likely causing the problem, and it should be more like 10k for an LM Left click on the graphic to make it go full-screen and, by the way, here’s the LTspice datashheet list just in case you want to play with the circuit s: My wiring diagram looks similar to this picture I created in LTspice.

Can you describe what you mean by “invert the inputs” by editing your question, please? Steve G 4, 1 7 Lm29903n I get my desired voltage out of my Comparator, how do I stabilize it so that I can use it on a load?

Also, thanks for the 10K resistor idea that got the voltage down to what I was hoping to see. One more question thought please? You need a pullup resistor. 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 datasueet output:.