LM2903N DATASHEET PDF

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The LM has an open collector output so it can not actively drive a positive voltage.

They helped a lot. 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: One more question thought please?

Since your original question has been dealt with to your satisfaction, it’s done with. Datashert need to add a pull-up resistor of about 10k between the output pin and your positive supply rail. Post as a guest Name. Why is this happening. Can you describe what you mean by “invert the inputs” by editing your question, please?

(PDF) LM2903N Datasheet download

Thank you for pointing this out and I will go back over the datasheet to get a better understanding of how to read it. My wiring diagram looks similar to this picture I created in LTspice.

Sign up using Email and Password. The horn is about 15 ohms. After I get my desired voltage out of my Comparator, how do I stabilize it so that I can use it on a load? Say I want to use the 12v Vout to make my horn go off on my car.

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LMN Datasheet(PDF) – NXP Semiconductors, Low power dual voltage comparator

Left click on the graphic to make it go full-screen and, by the way, here’s the LTspice datasueet list datashheet in case you want to play with the circuit s:. Thanks for the drawings.

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: By using our site, you acknowledge that you have read datashheet understand our Cookie PolicyPrivacy Policyand our Terms of Service.

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. 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 clicking “Post Dataseet 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.

Sign up using Facebook. If you have a new question relating to a car horn, you should ask it separately. Just for grins – since you want to learn about comparators – it might be fun to take a look at datasheet two circuits below and figure out why VOUT2 switches and VOUT1 doesn’t, even though VIN is the same input to both circuits.

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Comparator help LmN Ask Question. Also, thanks for the 10K resistor idea that got the voltage down to what I was hoping to see.

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 datasheef pullup to the comparator’s output:. The LM has an open-collector output.

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For a better handle on what’s going on with an LM, take a a look at the data datashretparticularly at Figure 3. 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.

Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our datashest terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. 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 Steve G 4, 1 7 Sign up or log in Sign up using Google. I am using a LMN to learn about comparators.