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I will look into your question. I am using a LMN to learn about comparators. The horn is about 15 ohms. 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 dafasheet it go full-screen and, by the way, here’s the LTspice circuit list just in case you want to dafasheet with the circuit s:.
Sign up using Email and Password. Sign up or log in Sign up using Google. Thanks for the drawings.
I looked over the datasheet for 3 days and didn’t see the typical application. Lm293n testing the pull up resistor, I am left wondering when I invert the inputs I do not get 0v like I was expecting. They helped a lot. My wiring diagram looks similar to this picture I created in LTspice.
The LM has an open-collector output. You might want to try making your drawings easier to read, since that makes it much easier dattasheet us to follow the circuit’s ins and outs. Matthew Tubbs 5 1. Home Questions Tags Users Unanswered.
Can anyone help me come up with ideas to try and get this working?
Comparator help LmN Ask Question. Thank you for pointing this out and I will go back over the datasheet to get a better understanding of how to read it.
Comparator help (LmN) – Electrical Engineering Stack Exchange
Sign up using Facebook. 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.
LMN Fairchild Semiconductor, LMN Datasheet
However, when I check the output the resulting voltage is 0v. Steve G 4, 1 7 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 as a guest Name. One more question thought please? Email Required, but never shown. After I get my desired voltage out of my Comparator, how do I stabilize it so that I can use it on a load?
Reading the datasheet would have quickly cleared this up, there’s even a nice “typical application” schematic. Can you describe what you mean by “invert the inputs” by editing your question, please? 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. You need to add a pull-up resistor of about 10k between the output pin and your positive supply rail. You need a pullup resistor.