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LM2903N DATASHEET PDF

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Sign up using Facebook. Sign up using Email and Password. 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 drawing, and outputs go out the bottom and the right, kinda like this, after adding the pullup to the comparator’s output:.

Can you describe what you mean by “invert the inputs” by editing your question, please? The LM has an open collector output so it can not actively drive a positive voltage.

You need a pullup resistor. 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.

After I get my desired voltage out of my Comparator, how do I stabilize it so that I can use it on a load? Post as a guest Name. Can anyone help me come datashdet with ideas to try and get this working?

Matthew Tubbs 5 1. 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:. I am using a LMN to learn about comparators. 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: 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 dagasheet the comparator’s output: However, when I check the output the resulting voltage is 0v.

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You lm203n 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.

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lmm2903n The horn is about 15 ohms. Sign up or log in Sign up using Google. 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.

Thanks for the drawings. Say I want to use the 12v Vout to make my horn go off on my car. Home Questions Tags Users Unanswered. For a better handle on what’s going on with an LM, take a a look at the data sheetparticularly at Figure 3.

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.

I mistakenly thought the inverted its output. Steve G 4, 1 7 The LM has an open-collector output. You need to add a pull-up resistor of about 10k between the output pin and your positive supply rail. 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. Why is this happening. Unfortunately, that ohm pullup I showed is more than likely causing the problem, and it should be more like 10k for an LM My wiring diagram looks similar to this picture I created in LTspice.

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One more question thought please? They helped a lot. Reading the datasheet would have quickly cleared this up, there’s even a nice “typical application” schematic. Since your original question has been dealt with to your satisfaction, it’s done with.

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 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.

Comparator help (LmN) – Electrical Engineering Stack Exchange

Email Required, dztasheet never shown. Comparator help LmN Ask Question. I looked over the datasheet for 3 days and didn’t see the typical application. I will look into your question.