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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 datashee to the comparator’s output:. Can anyone help me come up with ideas to try and get this working? Just for grins – since you want to learn lm2903m 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.
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After testing the pull up resistor, I am left wondering when I invert the inputs I do not get 0v like I was expecting. Sign up using Facebook.
Can you describe what you mean by “invert the inputs” by editing your question, please? Thanks for the drawings.
(PDF) LM2903N Datasheet download
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: The LM has an open-collector output. For a better handle on what’s going on with an LM, take a a look at the data sheetparticularly at Figure 3. I am using a LMN to learn about comparators.
The LM has an open collector output so it can not actively drive a positive voltage. I mistakenly thought the inverted its output. Why is this happening. Unfortunately, that ohm pullup I showed is more than likely causing the problem, and it should be more like 10k for an LM My wiring diagram looks similar to this picture I created in LTspice.
They helped a lot. 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: Say I want to use the 12v Vout to make my horn go off on my car.
I will look into your 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.
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LMN Datasheet(PDF) – Motorola, Inc
I looked over the datasheet for 3 days and didn’t see the typical application. You need to add a pull-up resistor of about dxtasheet between the output pin and your positive supply rail. Comparator help LmN Datashest Question. Home Questions Tags Users Unanswered.
Post as a guest Name. The horn is about 15 ohms. 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. Left click on the graphic to make it go datashet and, by the way, here’s the LTspice circuit list just in case you want to play with the circuit s:. Reading the datasheet would have quickly cleared this up, there’s even a nice “typical application” schematic.
After I get my desired voltage out of my Comparator, how do I stabilize it so that I can use it on a load? Since your original question has been dealt with to your satisfaction, it’s done with. You’ll never get 0V out with GND equal to zero volts, no dtaasheet what, because of the saturation resistance of the comparator’s output transistor.