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  1. AnalogKid

    will this really give me a triangular wave?

    Inversely proportional - twice the frequency, half the amplitude. ak
  2. AnalogKid

    will this really give me a triangular wave?

    For a constant amplitude input squarewave, as its frequency increases the output triangle wave amplitude will decrease. This is because the integrator is a constant slew rate circuit. you don't say what the value of R5 is, but the larger it is, the straighter the triangle sides will be. ak
  3. AnalogKid

    Problem on Radio Energy Harvesting circuit- Is Cockcroft Walton circuit fail?

    You are using power diodes, which have a relatively large capacitance, slow response time, and large Vf. Change to Shottkey signal diodes. To rectify an ac signal at 2.4 GHz frequency, you need exceptional diodes, ones with very low junction capacitance and fast response times. ak
  4. AnalogKid

    Just how

    It works like a dc/ac inverter, just like the blog title says. Here is a concept drawing of the design: https://en.wikipedia.org/wiki/Power_inverter#Advanced_designs To learn more about inverters, follow the advice in post #4. ak
  5. AnalogKid

    will this really give me a triangular wave?

    Turning a ramp or sawtooth wave into a symmetrical triangle wave is much more difficult. ak
  6. AnalogKid

    Selection of Op Amps

    Relying on the peak output voltage capability of the opamp to set the signal amplitude is not a good approach. That parameter varies significantly from one device or lot to another. You have no choice with the relaxation oscillator, but you do with the output buffer. Between the 1208 and the...
  7. AnalogKid

    Hovering Drone....W/Kg Calculation.....

    EDIT: Twice in post #4 I said thrust instead of lift: "In this scenario, another term for force is lift." "As the air stream leaves the trailing edge of the wing at a downward angle, the vertical component of that vector is the lift." ak
  8. AnalogKid

    Methods to reduce wall power current?

    Don't knock the 3-months. In my first 2 weeks on this forum, his minimum required background to understand his wisdom was 40 years and 20 years (separate posts on two different threads). Which raises a question - since quality is not a requirement, what does it take to be a VIP member? ak
  9. AnalogKid

    Selection of Op Amps

    Reasonable questions, but woefully short on details. Please post a schematic of your ideas so far. There are 1000 different opamps that can be used as a voltage follower. What frequency? What output voltage range? What output current? Also, "a ±5V supply [not V- or V+]" doesn't make sense...
  10. AnalogKid

    Communication vs Electronics

    With nothing to go on but the lists of courses, Electronics is much more hands-on-the-hardware stuff - components,circuits, test equipment, etc., while Communications is much more about the information or data, with a higher-level awareness of the characteristics of the various media structures...
  11. AnalogKid

    Hovering Drone....W/Kg Calculation.....

    F = m x a Force equals mass times acceleration. Force is the dead weight of the drone. mass is the mass of air being displaced by the rotors. Acceleration is the acceleration of the air being displaced. - or - F = 1/2 m x v^2 Force equals one-half times mass times velocity squared. In...
  12. AnalogKid

    Can we charge a battery using a power supply?

    Nope. You can measure the battery terminal voltage while it is being charged by connecting the battery terminals to a voltage monitor circuit. Also, if you put a small resistor in series with the battery, you can measure the voltage across the resistor and determine the charge current...
  13. AnalogKid

    Digital volt meter doesn't like a power supply?

    In post #1 it powers "anything else". ak
  14. AnalogKid

    Digital volt meter doesn't like a power supply?

    Is it a linear or switching power supply? ak
  15. AnalogKid

    Home made inverter...

    Actually, there is nothing in the original question or in my response that mentions or implies class D operation. While his first schematic has two transistors operating in their saturation region, they are approximating a low frequency sine wave with a stepped square wave approach. There is...
  16. AnalogKid

    why not odd number microcontrollers

    Standardization and conformity. A small number of data path widths limit some options, but the cost drops dramatically when millions are made. Using 16-bit wide RAM data is wasteful for 12-bit values, but cost 1/1000th the price of a true 12-bit wide data system. Honeywell mainframes has 36...
  17. AnalogKid

    Driving both N and P mosfet with same power supply

    An NPN transistor switch such as a 2N4401 will delay the signal by less than 1 us, probably closer to 200 ns. If you need less delay than this, you can use any inverting CMOS logic gate. If you don't want to add a 14 pin package for only one gate, some CMOS functions are available in...
  18. AnalogKid

    Home made inverter...

    There is a fundamental and very large difference between driving two power transistors as saturated switches (your first schematic) and driving them as linear amplifiers from your second schematic. You are correct that the 8038 sine output has to be level-shifted, but that's the easy part...
  19. AnalogKid

    Question about double layer capacitors

    "The rich are different" - F. Scott Fitzgerald So are ultracaps. ak
  20. AnalogKid

    Question about double layer capacitors

    You don't say what meter you are using, but if you look up its specs it probably has a max-min range for the capacitance function. I doubt that 0.1 F is within its range. ak
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