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Your name or email address: Why does -9 work? Using a phototransistor as input into comparator Posted by connellyw in forum: Jan 11, 7.

Jan 11, 6. Hey guys, Ive just started to dabble with electronics and thought that this would be a good project to learn about transistors. Any ideas as to why this is, just another issue from the given op amp in use perhaps? Jan 11, 3. Jan 11, 8. Jan 12, My questions are essentially: Daasheet having trouble following.


That would destroy the op-amp.

Delay using LM356 as comparator

I assume LM op amp? Jan 11, 5. Interestingly enough though I had a little time to play around with the circuit and found that if I changed R to keep the cap from discharging below. See common mode range in the data sheet. I couldn’t find a datasheet for LM Also, I am trying to stay away from IC’s so I can get a better handle on transistor switching first time using them but any ideas with them are welcomed so i know for future use.

LM356 Datasheet PDF

And everything is great with the split supply, but you get odd behavior when V- is ground? Sep 9, 15, 5, Nov 12, 3, 2, All references gave me LM; which wouldn’t make a good comparator.

Jan 11, 26 0. No, create an account now. Wayneh, this is the configuration in which it is currently operating. Nov 23, 8, 6, Boy, is that an ugly IC.

I think your problem may be that the inputs can only work at 3 volts above the negative supply. Any info you can give me on operation is much appreciated as well as any other circuit ideas.


Delay using LM as comparator | All About Circuits

Dec 29, 1, You May Also Like: Do you already have an account? Do you mean LF? I don’t understand what you mean about setting Vcc to -9V. Right now I’m just using LEDs to test the circuit and will get adequate components to run the motor, and I removed the resistor from the output to the base. Op amp as comparator Posted by nickyoko21 in forum: Aug 12, 2, Jan 11, Could you draw in the resistor values and show how the power is applied? Most of the resistor values are or less, the drain resistor R is 33k, C is uF, op amp output when switch is open is 7.

Thanks for all the replies, I’ll order some proper comparators in the morning. Jan 11, 4.