LM2903N DATASHEET PDF

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You might want to try making your drawings easier to read, since that makes it much easier for datasheft to follow the circuit’s ins and outs. 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 You need a pullup resistor. Can anyone help me come up with ideas to try and get this working?

LMN datasheet, Pinout ,application circuits Dual Comparator

Reading the datasheet would have quickly cleared this up, there’s even a nice datasheeh application” schematic. Say I want to use the 12v Vout to make my horn go off on my car. I am using a LMN to learn about comparators.

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

You need to add a pull-up resistor of about 10k between the output pin and your positive supply rail. 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’ll never get 0V out with GND equal to zero volts, no matter what, because of the datasheey resistance of the comparator’s output transistor.

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I looked over the datasheet for 3 days and didn’t see the typical application. Home Questions Tags Users Unanswered.

If you have a new question relating to a car horn, you should ask it separately.

One more question thought please? Email Required, but never shown. Thank you for pointing datasheeet out and I will go back over the datasheet to get a better understanding of how to read it. They helped a lot. 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:.

Matthew Tubbs 5 1. Comparator help LmN Ask Question. Sign up using Facebook. Steve G 4, 1 7 I will look into your question. After I get my desired voltage out of my Comparator, datashet do I stabilize it so that I can use it on a load? Sign up or log in Sign up using Google. 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:.

The LM has an open-collector output. The horn is about 15 ohms.

Dual Comparator

Datashee your original question has been dealt with to your satisfaction, it’s done with. After testing the 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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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.

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(PDF) LM2903N Datasheet download

Also, 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: 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. 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.

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. My wiring diagram looks similar to this picture I created in LTspice. Sign up using Email and Password.

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