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Recent content by orbanp

  1. O

    LC Meter -- colpitts oscillator

    Here is a more detailed explanation: **broken link removed** Peter
  2. O

    Help understanding the Spice and LTSpice macro model of opamps.

    Hi Alan, In schematic capture, if you pull down the "Edit" menu, somewhere in the middle there is a menu item called "Component", the shortcut is F2, the icon is a logic and gate, it gives the library selection. On the top, in the tool bar, there is also the logic and gate icon for selecting...
  3. O

    Help understanding the Spice and LTSpice macro model of opamps.

    Now you are asking a different question! The LT1026 is built into LTspice, it is in the PoweProducts directory. You do not need to include anything! Press "F2", then go to the "PowerProducts" entry there and you will find it among them. The reason you got that binary file for the LT1026...
  4. O

    LC Meter -- colpitts oscillator

    In the kerrywong drawing the L and C settings of the switch are mixed up. You should have a parallel LC circuit there to the ground for the oscillator to run. When measuring C, Cx is parallel with the 1nF cap, and when measuring L. Lx is in series with the the 221uH coil. But you still need that...
  5. O

    LM301A IC Simulation results by spice or LTSPICE

    This library has it: http://www.gunthard-kraus.de/Spice_Model_CD/Mixed%20Part%20List/Spice-Models-collection/opamp.lib Peter
  6. O

    Help understanding the Spice and LTSpice macro model of opamps.

    Hi Alan, If you include a .sub file into your circuit with the .lib or .inc directive, LTspice lets you open the file from within. If you right-click on the directive it will have an option to open it. Try it! But any external text editor would work, as mentioned before. As for making...
  7. O

    SMPS transformer testing

    Hi Chirag, There are lots of things wrong with that drawing! Assuming the 240VAC is the input, the bridge rectifier is not oriented correctly, the inputs and outputs are mixed up! Assuming the rectifier fault is corrected, you are going to get DC voltage on that 10uF filter capacitor. A...
  8. O

    Help understanding the Spice and LTSpice macro model of opamps.

    Hi Alan, There is some brief help in the LTspice help menu, help topics, under FAQ, and then third party models. There is also a very active LTspice Yahoo group, you should join up there. That is the primary support venue for LTspice. Good luck, Peter
  9. O

    2N3904/06 pair max dissipation on heatsink

    The datasheet states the max dissipation for the transistors is 625mW, and the max operating junction temperature is 150C. It also states that "These ratings are limiting values above which the serviceability of any semiconductor device may be impaired." If you plan to go beyond these ratings...
  10. O

    I2C interfacing with 8051

    Just do a Google search! There are libraries and applications notes around. Peter
  11. O

    P3A AC calculations problem

    Rereading the first reply, I was a bit terse, and not too helpful explaining what you were seeing there. C1 R5 is in fact a high-pass RC filter, "pushing it" meaning that it was not the intended purpose, but to separate DC voltages from the input. As a side effect it also acts as a high-pass...
  12. O

    P3A AC calculations problem

    Hi WebaldO, My apologies that you did not find the reply helpful, however, you might as well follow the advise, and go through some tutorials on electronics, it would serve you well! Simulation is a powerful tool only if you know how to interpret the results! Some points. Picture 1 is not a...
  13. O

    base current value of a transistor

    What you have drawn there, it does not make sense. The BE junction of the transistor gets 16V, assuming it is in the forward direction. A silicon diode in the forward direction takes only about 0.6V - 0.7V 16V surely will destroy the transistor. Peter
  14. O

    P3A AC calculations problem

    It is not clear what are you simulating. Here is the simulation in LTspice, and it is working fine. Suggestion is to go through some tutorials. Good luck, Peter
  15. O

    Design radio receiver

    Sony has an AM/FM radio chip that is running on 1.5V, the CXA1129, they also made a radio with it. It well documented here, even with paper on the chip by their designers: https://earmark.net/gesr/srf59.htm Peter

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