Single supply op amp LM358 astable multivibrator circuit with flashing LED demonstration circuit
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- Опубліковано 9 вер 2024
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Using positive feedback going back to a fixed resistor voltage divider plus negative feed back going to a capacitor, the single supply LM358 op amp output starts oscillating high and low. If an LED and protective resistor are added as a load, the LED will flash on and off as the output changes high and low.
#electronics #LM358 #LED
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THANK YOU SO MUCH! I WASNT ABLE TO GET ANY OSCILLATIONS FROM GOOGLE AND I SAW YOUR VIDEO AND IT WORKED THANK YOU!
Cool, I am interested in this topic of the op amp after seeing another youtuber mentioned it but I haven't had the time. I like your take on it better since I get a better view of the breadboard.
Glad to hear that! Thanks for watching!
@@Electronzap , no problem. Thank you for the content.
It works I test it and it works thanks for this test circuit 👍👍👍
Glad to hear, thanks for watching!
Very nice video. Nice explanation.
Thanks!
Thanks for the video, finding it tough to understand the effect of the positive feedback in this circuit.
so say we start with 2.5v at non inverting input, as inverting input tries to match the 2.5v the capacitor charges and the output is positive.
But when the inverting input reaches 2.5v the output of the op-amp goes low and thus pulls the non inverting input low also through the positive feedback loop?
Thanks.
I feel like I have this wired right...but led just stays high...no flashing...also there is no voltage difference between pins 2 and 3...which would explain I think why it’s not flash but don’t understand why there is no voltage difference
@electronzapdotcom is the formula for your timing 10μf x 100k. Cause that is what I did and it seems to match the timing of your circuit? I.E. τ = 1 Second.
I probably just guessed what values would give me the timing I need, and adjusted them as needed to actually get the speed I wanted. :)
@@Electronzap Thank you, I have found if the capacitor is less than 1000μf you get accurate outcomes by doing resistance × capacitance. For example 1M * 1μf = 1 second which is correct when you breadbord it at 6V
@@Electronzap What if that 5v supply is removed, and it's adjacent one 10K resistor is removed?
Will I still get POSITIVE SQUARE OUTPUT VOLTAGE OR POSTIVE SQUARE OUTPUT WITH NEGATIVE SQUARE OUTPUT?
Please explain the uses of this 5V supply?
What if that 5v supply is removed, and it's adjacent one 10K resistor is removed?
Will I still get POSITIVE SQUARE OUTPUT VOLTAGE OR POSTIVE SQUARE OUTPUT WITH NEGATIVE SQUARE OUTPUT?
Please explain the uses of this 5V supply?
You will get a diffrent voltage outputs depending on the refrence voltage so you can try other resistors and see how they work out for you
Please Sir could you modify this circuit for charging 3.7 lithium ion battery with three led charging status?
can I use lm348 it is a quad op amp but can I use one of them
You can use any op amp for an op amp circuit as long as it is capable of doing what you need it to do. Just need to check it's datasheet. You can always use just 1 of the integrated circuit's 4 op amps.
I check it's block diagram and it's almost the same but it has 4 op amps inside