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Recent content by akbarza

  1. A

    circuit for reducing turn on voltage of bjt

    i saw it before, but i do not know how it works.
  2. A

    circuit for reducing turn on voltage of bjt

    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
  3. A

    analyze and find oscillating frequency

    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
  4. A

    analyze and find oscillating frequency

    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...
  5. A

    analyze and find oscillating frequency

    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...
  6. A

    analyze and find oscillating frequency

    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...
  7. A

    analyze and find oscillating frequency

    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...
  8. A

    analyze a Twin_T oscillator

    hi i did this.
  9. A

    analyze a Twin_T oscillator

    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...
  10. A

    analyze a Twin_T oscillator

    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...
  11. A

    [SOLVED] LTSpice Simulation error

    try: eliminate R2 and connect the bottom of v1 to ground(g in ltspice ) and if your problem exists still, refer to a ltspice group such as group.io .
  12. A

    colpitts oscilator questions

    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?
  13. A

    colpitts oscilator questions

    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...
  14. A

    determine impedance of Twin_T circuit

    hi as I said i want impedance vs. frequency for Twin_T circuit
  15. A

    determine impedance of Twin_T circuit

    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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