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hi
in the below pic, with simulation, it is seen that the turn-on voltage of Q1 is decreased from approximately 640mv to below 100mv.
explain what is the reason for it. how does pnp bjt (Q2) effect on turn-on voltage of Q1?
thanks
hi
I discussed the matter of impedance calculation in #28
can anyone guide me on how to calculate(or measure) the impedance?
1704181221
hi
i read:
https://www.onsemi.com/download/data-sheet/pdf/lm358-d.pdf
thanks for reply
I read the datasheet of onsemi.com lm 358, twice, but not very carefully, and I did not find the things you said. ( in the second I explored vcc-0.7 and vcm, but I could not find them).
thanks again for the reply and your good suggestions
1704111832
thanks for reply
I read the...
hi
in the mentioned link in #6namely:
https://eng.libretexts.org/Bookshelves/Electrical_Engineering/Electronics/Operational_Amplifiers_and_Linear_Integrated_Circuits_-_Theory_and_Application_(Fiore)/09%3A_Oscillators_and_Frequency_Generators/9.02%3A_Op_Amp_Oscillators
, said that ( in the below...
hi
can I ask you how the common mode range is vcc-1.7 ?
1704008270
this 2v headroom, Where did this amount come from?
what is the meaning of PRIO?
how can I calculate vol and voh? plz, explain.
1704008609
how vcm is calculated?
1704008793
what is your meaning of ' LM358 asymmetric output...
hi
I found the below schematic in an Lm358 datasheet that belongs to www.onsemi.com.
by attention to the pic, in the datasheet is written that for R3=R1||R2 then the oscillation frequency is f=R1*Rc/(4*c*Rf*R1). but there is no Rc in the schematic.
1)how can analyze the circuit to obtain a...
hi
the file format is .png and its size is 60kB. with this info, does uploading the pic have a problem?
hi, thanks for your reply.
Although I read your reply twice, your details are more complex for me, I did not understand most of what you said. can you introduce to me a reference for theses...
I uploaded a schematic that was drawn in ltspice. I wanted to upload its pic and tried two times but the pic uploaded to 100% but paused on it. I also sent two messages to this site about this problem but I did not receive any response.
if it is possible for everyone, please upload the image of...
hi
in a bjt, if vbe<0.6 then is it possible that there is Ic? If your answer is positive in which condition? For example, if vbc is forward and vbe<0.6, is it possible that there is ic?
i
I think a bjt has current when vbe is larger than 0.6-0.7, but in this simulation, I saw that when vbe<0.6, there is current from collector to emitter. I want anyone to clear this with me and explain why there is a current when vbe<0.6.
1702109167
hi, thanks for your reply
please tell me if...
hi
I want to draw the impedance of the Twin_T circuit, so I run the above schematic in ltspice. I draw v(v1)/i(v1) to show impedance.
Twin_t impedance must show a figure like a bandpass filter.
namely, what I expect is that impedance rises and in f=1/2pi*r*c=25hz takes a pick and then falls...
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