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Steve G 4, 1 7 The LM has an open collector output so it can not actively drive a positive voltage.
If you have a new question relating to a car horn, you should ask it separately. 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.

The horn is about 15 ohms. 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. Sign up using Facebook. Also, thanks for the 10K resistor idea that got the voltage down to what I was hoping to see. Since your original question has been datashheet with to your satisfaction, it’s done with.
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 lk2903n these policies. Unfortunately, that ohm pullup I showed is more than likely causing the problem, and it should be more like 10k for an LM Say I want to use the 12v Vout to make my horn go off on my car.
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: Comparator help LmN Ask Question. Email Required, but never shown.
The LM has an open-collector output. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Thank you for pointing this out and I will go back over the datasheet to get a better understanding of how to read datasgeet. I am using a LMN to learn about comparators.
LM2903N Datasheet
I will look into your question. However, when I check the output the resulting voltage is 0v. Thanks for the drawings. You’ll never get 0V out with GND equal to zero volts, no matter l2903n, because of the saturation resistance of the comparator’s output transistor.
Can anyone help me come up with ideas to try and get this working? 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:.
LMM vs LMN/NOPB feature comparison | Findchips
Post as a guest Name. Datzsheet the datasheet would have quickly cleared this up, there’s even a nice “typical application” schematic. They helped a lot. Why is this happening. One more question thought please? 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 to add a pull-up resistor of about 10k between the output pin and your positive supply rail.
I looked over the datasheet for 3 days and didn’t see the typical application. You need a pullup resistor.
Sign up or log in Sign up using Google. I mistakenly thought the inverted its output.

Can you describe what you mean by “invert the inputs” by editing your question, please? 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:. 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.
Sign up using Email and Password. Home Questions Tags Users Unanswered. After testing the pull up resistor, I am left wondering when I invert the inputs I do not get 0v like I was expecting.
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? For a better handle on what’s going on with an LM, take a a look at the data sheetparticularly at Figure 3. Matthew Tubbs 5 1.
