LM2903N DATASHEET PDF

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I am using a LMN to learn about comparators. Reading the datasheet would have quickly cleared this up, there’s even a nice “typical application” schematic.

If you have a new question relating to a car horn, you should ask it separately. The horn is about 15 ohms.

Steve G 4, 1 7 Post as a guest Name. However, when I check the output the resulting voltage is 0v.

LM2903N Datasheet

They helped a lot. Why is this happening. Comparator help LmN Ask Question. The LM has an open collector output so it can not actively drive a positive voltage. 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.

I mistakenly thought the inverted its output. For a better handle on what’s going on with an LM, take a a look at the data sheetparticularly at Figure 3. Sign up using Email and Password. Thanks for the drawings.

Can you describe what you mean by “invert the inputs” by editing your question, please? I looked over the datasheet for datasheeet days and didn’t see the typical application.

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. After testing dattasheet pull up resistor, I am left wondering when I invert the inputs I do not get 0v like I was expecting.

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Dual Comparator

Sign up or log in Sign up using Google. 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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Sign up using Facebook. Email Required, but never shown. 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:.

Matthew Tubbs 5 1. Can anyone help me come up with ideas to try and get this working? Unfortunately, that ohm pullup I showed is more than likely causing the problem, and it should be more like 10k for an LM Home Questions Tags Users Unanswered.

One more question thought please? You need to add a pull-up resistor of datasheer 10k between the output pin and your positive supply rail.

LMM vs LMN/NOPB feature comparison | Findchips

I will look into your question. 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.

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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: You need a pullup resistor.

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.

After I get my desired voltage out of my Comparator, how do I stabilize it so that I can use it on a load?

LMN Datasheet(PDF) – National Semiconductor (TI)

The LM has an open-collector output. 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.

Lm290n3, thanks for the 10K resistor idea that got the voltage down to what I was hoping to see. 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.

By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policy lm290n, and our Terms of Service. Say I want to use the 12v Vout to make my horn go off on my car.