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  1. KlausST

    multiple bjt switch circuit interpretation

    Hi, You are not cooperative, don't answer questions, don't confirm my doubts, don't follow my recommendations. I hope you don't mind when I leave now. No, not "Vbe" But "V_in" No, "Vemiter-Vbase" is posititive. V_BE is negative. No, Vb > Vc It is an emitter follower. R8 makes the base...
  2. KlausST

    multiple bjt switch circuit interpretation

    Hi, Please confirm: "vdd_3" means "+3V" Also mind that on schematic usually the most positive supply is on top and the most negative supply is on bottom af a sheet. So +3V should be on top, GND on bottom. Your PNP symbol should be rotated that emitter is on top, collector on bottom, base on...
  3. KlausST

    AD9833 doesnot obey my code

    HI; Did you follow Figure 26 flow chart ... especially after change of frequency registers? Klaus
  4. KlausST

    Using timer in PIC18F

    Hi, Eventually read some documents??? read the code you posted in post#7: The interrupt executes the TMR0_ISR(). (every related C tutorial, every library tutorial will tell you this) ...within the TMR0_ISR the counter is handled an on match/overflow the TMR0_CallBack is executed. Before you...
  5. KlausST

    Using timer in PIC18F

    Hi, The benefit of the interrupt is that you usually don`t need to care about it. The interrupt is triggered automatically and the callback function is executed automatically. So please tell us why you think you need to wait for it .. or check for it? * TMR0IF does not work. * TMR0_CallBack...
  6. KlausST

    Using timer in PIC18F

    Hi, That´s the key benefit of the interrupt: You don´t need a function to wait for it to come. --> Read most basic tutorials about interrupts. Klaus
  7. KlausST

    Soldermask under QFN

    Hi, Show pictures of the footprint and the soldermask. What's the exact part name? Klaus
  8. KlausST

    multiple bjt switch circuit interpretation

    Hi, A BJT never can work the same as a MOSFET. A BJT has different states with different operation modes. Why do you refer to an internet page with explanations, but neither use the example circuits ... nor use the given math? What should I do now? Copy the pictures and the text? Please ask...
  9. KlausST

    multiple bjt switch circuit interpretation

    Hi, All the tutorial circuits show resistors. Yours not. Add them. Mind V_BE polarity Switch open --> no current flow Switch closed --> current flow Klaus
  10. KlausST

    PAE Graph

    Hi, show us what you did. We just see the curve consisting of maybe 7 points. Surely not enough.. Klaus
  11. KlausST

    [SOLVED] How to determine the small-signal voltage gain of Common mode BJT amplifier?

    Hi, The discussion is "measured results vs simualted results". While the simulation does not care about capacitor polarity, in the real circuit a wrongly oriented capacitor may shift DC operating point of the BJT.... modifying the AC measurement results. You have a simulation tool, so use it...
  12. KlausST

    [SOLVED] How to determine the small-signal voltage gain of Common mode BJT amplifier?

    Hi, C2 polarity seems to be wrong. .. then it's a good idea to tell us * the simulation results and the * the measured results And how you measured them. AC measurement is not a simple as DC measurement. There are different AC measurement and calculation methods with different results. Klaus
  13. KlausST

    multiple bjt switch circuit interpretation

    Hi, The circuit (upper of post#5) is called "high side open collector" * "high side" because it is switching the positive (high) supply voltage (+3V) instead of GND. * "open collector" because the collector is the output....and it's left open ... so the end user may connect whatever he wants to...
  14. KlausST

    Implementing data transfer protocols in VHDL

    Hi, Implementing means you design (or prepare) the physical interface. (Shift registers, address registers, data registers, acknowledge, data direction switch...) And you design (or prepare) the protocol. (In parts already mentioned above) SPI is simplest ... basically just shift registers ...
  15. KlausST

    PAE Graph

    Hi, Please follow the recommendations that memers gave at your other thread: https://www.edaboard.com/threads/how-to-make-pae-graph-smoother.397839/post-1710955 Still the step size is too coarse. Klaus
  16. KlausST

    Using timer in PIC18F

    While post#9 is correct it still does not fit to your code. The code of post#7 uses a C library, while your explanation is raw silicon behaviour. Decide whether you want to use C library or not. Yes or no. Then focus on your decision, read the regarding document, give us the link. Don´t mix...
  17. KlausST

    Using timer in PIC18F

    Hi, You don´t understand how it works. May I ask which tutorials you´ve read which videos you watched ... to get to this conclusion? Please provide links to them, so we can discuss about it. Step by step. Klaus
  18. KlausST

    Lm2907 circuit design

    Hi, We need technical informations. What frequency is the PWM? What source impedance is the signal? (Type, datasheet....) In simplest case an RC filter should work. Maybe two RCs, maybe an active circuit with Opamps. Klaus
  19. KlausST

    LTC4020 board troubleshoot

    Hi, I guess there are layers missing Klaus
  20. KlausST

    Wireless power bank project

    Hi, The coil is used as transmitter, receiver, or both? What overall efficiency do you expect? Klaus

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