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After I get my desired voltage out of my Comparator, how do I stabilize it so that I can use it on a load?
You need a pullup resistor. Just for grins – since you want to learn about comparators – it might dafasheet 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. Thank you for pointing this out and Datahseet will go back over the datasheet to get a better understanding of how to read it. The LM has an open-collector output.
However, when I check the output the resulting voltage is 0v. Reading the datasheet would have quickly cleared this up, there’s even a nice “typical application” schematic. After testing the pull up resistor, I am left wondering when I invert the inputs I do not get 0v like I was expecting.
I will look into your question. For a better handle on what’s going on with an LM, take a a look at the data sheetparticularly at Figure 3. 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.
Sign up or log in Sign up using Google. Thanks for the drawings. They helped a lot. I looked over the datasheet for 3 days and didn’t see the typical application.
LMN Datasheet pdf – Dual Comparator – Fairchild Semiconductor
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:. You need to add a pull-up resistor of about 10k between the output pin and your positive supply rail.
Left click on the graphic to make it go full-screen dataasheet, by the way, here’s the LTspice circuit list om2903n in case you want to play with the circuit s: Since your original question has been dealt with to your satisfaction, it’s done with. If you have a new question relating to a car horn, you should ask it separately.
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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:. I mistakenly thought the inverted its output. Comparator help LmN Ask Question. Also, thanks for the 10K resistor idea that got the voltage down to what I was hoping to see. The LM has an open collector output so it can not actively drive a positive voltage.
Can anyone help me come up with ideas to try and get this working?
I am using a LMN to datahseet about comparators. Email Required, but never shown. One more question thought please? The horn is about 15 ohms.
LMN Fairchild Semiconductor, LMN Datasheet
Say I want to use the 12v Vout to make my horn go off on my car. You might lm2903nn 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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