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What exactly am I screwing up here?

LMN Datasheet, PDF – Datasheet Search Engine

I’d like to make a few comments: It should not be used a design parameter for several reasons. Thank you all so much for any input. You can omit the base resistor.

Hopefully, I was clear in my explanation. Its purpose is to protect Q1 from too much base current, which is not a problem in this circuit. In this case, something in the 1K to datasueet range might help, but I wouldn’t put it in until needed.

Hope this helped, Kevin. Delete R1 for now. Mar 4, 2, Quote of the day. That will also help with the max output voltage. Dec 29, Dec 27, 2. With that information I assumed I would reference the 3rd entry for the behavior I could expect.


I am trying to setup a constant current source using a 2n and a Motorolla LMN. Your beta assumptions are wrong. How does this factor in? Why does your schematic drawing software produce backwards negative white lines on a black background instead of a normal positive image?? Also can’t you turn off the “chicken pox” dots?? You May Also Like: Could someone explain this section to me?

Stock/Availability for: LM356N

Also, Vce is listed as 1V here. Lastly, I’ve heard it is poor practice to use an op-amp as a comparator without some sort of hysteresis.

An easier to read schematic: How I see it if I’m fully on, what would my collector current be? You have several problems. Dec 28, As it stands right now, I get 2. Mar 14, 20, 5, Jun 29, 8. Datasheef serial connections and USB to serial datasheet connections are covered. The LMN does not go rail-to-rail so the output is 3. Most importantly, the opamp gain at DC is around , so that additional 70 doesn’t really figure into the gain equations. If you have 3. AC gain confusion Posted by vustudent in forum: Mar 30, 7, 1, My Rationale Using the datasheet, to the best of my ability, it looks like my DC current gain would be No, create an account now.


Dec 20, 10, 1, You only need 4mA, so beta isn’t a critical parameter. DC current gain Posted by qitara in forum: Do you already have an account?

2n3904 DC current gain confusion

You didn’t show the entire datasheet page, but I think the DC gain of 70 is a minimum value for that collector current. Your name or email address: When the voltage across my sense resistor exceeds 4V, 4mA total current, the LMN will output low unbiasing the 2n I know I may have to implement some hysteresis datasheet this circuit.

Dec 28, 4. To avoid these issues, you can change your voltage divider to use a voltage below the guaranteed max input voltage. Aug 1, 7, 2, By that datssheet my base current, 3. Beta is also dependent on Vce. Sep 20, Dc gain Posted by Yuvaloh1 in forum: I am pretty sure I’m interrupting the datasheet incorrectly.