LM2903N DATASHEET PDF

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Comparator help (LmN) – Electrical Engineering Stack Exchange

My wiring diagram looks similar to this picture I created in LTspice. 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. For a better handle on what’s going on with an LM, take a a look at the data sheetparticularly at Figure 3.

Dual Comparator

One more question thought please? 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. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

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

Steve G 4, 1 7 Comparator help LmN Ask Question. I looked over the datasheet for 3 days and didn’t see the typical application.

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

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: Sign up using Facebook. However, when I check the output the resulting voltage is 0v.

Thank you for pointing this out and I will go back over the datasheet to datahseet a better understanding of how to read it. Matthew Tubbs 5 1.

If you have a new question relating to a car horn, you should ask it separately. I am using a LMN to learn about comparators. 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 circuit list just datashet case you want to play with the circuit s: 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.

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Why is this happening. You need a pullup resistor. dafasheet

The LM has an open-collector output. Reading the datasheet would have quickly cleared this up, there’s even a nice “typical application” schematic. Sign up using Email and Password.

Can anyone help me come up with ideas to try and get this working? 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 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. Since your original daasheet has been dealt with to your satisfaction, it’s done with. Home Questions Tags Users Unanswered.