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Also, thanks for the 10K resistor idea that got the voltage down to what I was hoping to see. 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. Sign up or log in Sign up using Google. Email Required, but never shown. They helped a lot. The horn is about 15 ohms.
ST Microelectronics
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 looked over the datasheet for 3 days and didn’t see the typical application.
Since your original question has been dealt with to your satisfaction, it’s done with. You need a pullup resistor. Can anyone help me come up with ideas to try and get this working? If you have a new question relating to a car horn, you should ask it separately. Say I want to use the 12v Vout to make my horn go off lm9203n my car.
I mistakenly thought the inverted its output. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Sign up using Email and Password. You need to add a pull-up resistor of about 10k between the output pin and your positive supply rail.
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. Why is this happening. The LM has an open collector output so it can not actively ddatasheet a positive voltage.
Dual Comparator
One more question thought please? Thanks for the drawings. Steve G 4, 1 7 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. 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.
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 datasheef in LTspice. For a better handle on what’s going on with an LM, take a a look at the data sheetparticularly at Figure 3. 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 satasheet in case you want to play with the circuit s: Home Questions Tags Users Unanswered.
LMN Datasheet(PDF) – NXP Semiconductors, Low power dual voltage comparator
Thank you lm903n pointing this out and I will go back over the datasheet to get a better understanding of how to read it. 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.
Matthew Tubbs 5 1. However, when I check the output the resulting voltage is 0v.
LMN Datasheet pdf – Dual Comparator – Fairchild Semiconductor
Comparator help LmN Ask Question. I am using a LMN to learn about comparators. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policydatasheef that your continued use of the website is subject to these policies.
Post as a guest Name. 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 datasueet to the comparator’s output:. 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 using Facebook.
