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  1. WHONOES

    Replace MOSFET AO4433 With FDS6679

    Are the packages the same or very similar?
  2. WHONOES

    Anyone know what type of resistor this is?

    That first band looks more brown than red. I then think that the gold band is a multiplier (0.1) which then makes the resistor 0.1Ω. Still, I could be wrong.
  3. WHONOES

    What's the working principle of this inverter circuit ?

    Yes but, I think the circuit is an example that said az has found and is not for a specific application. If it was just to power a lamp as seems to be indicated then a higher frequency is no problem.
  4. WHONOES

    Boost converter

    You don't need to resort to a microcontroller, it can all be achieved with a suitable PWM controller (even a 555) and some opamps.
  5. WHONOES

    MPPT charge control Project - LT3652

    I forgot to ask what the range of the reference voltage coming from the potentiometer is.
  6. WHONOES

    Why are actuators inductive?

    I think they are all variations on English English. But there again I would wouldn't I.
  7. WHONOES

    Thyristor as a triac

    A proper circuit diagram will be more illuminating.
  8. WHONOES

    MPPT charge control Project - LT3652

    At first glance, it looks as though you feedback resistors R3 , 4 and 5 are incorrect. Have a look at the datasheet schematic and text.
  9. WHONOES

    Boost converter

    Overshoot in the simulation could be caused by the lack of dc resistance in the inductor. A spice simulator will treat L1 as a perfect inductor with a correspondingly high Q.
  10. WHONOES

    Thyristor as a triac

    You have to drive each gate individually. The best way and also get galvanic isolation is to use a small pulse transformer between gate and cathode. This will also allow you to get the opposite polarity required. Sometimes, the trigger pulse is constructed as a series of pulses for the required...
  11. WHONOES

    Current flow in or out?

    Antenna length is calculated for of wavelength of received signal.
  12. WHONOES

    Question about active low pass filtering

    I have tried it out on my trusty simulator using a TL071 and an Ideal opamp getting very similar results. They vary a little from what others have done. See attached plot.
  13. WHONOES

    BUCK switching waveform ... problem

    I agree but, that generally affects their ability to regulate properly.
  14. WHONOES

    Sewing machine power supply/capacitor blown up

    I think the numbering on the capacitor is the old Philips components numbering system. The division was taken over by Rifa a number of years ago but they kept the Philips system as it was very logical. It is possible to determine exactly what the component is and its value from the number.
  15. WHONOES

    Driving a high power semiconductor laser

    Not too sure I like this one!
  16. WHONOES

    how to control a relay

    More information please.
  17. WHONOES

    Help with strobes!

    Could use a 555 a couple 4017 Johnson counters and perhaps a bit of logic.
  18. WHONOES

    BUCK switching waveform ... problem

    Loading the output will make the ripple worse.
  19. WHONOES

    What's the working principle of this inverter circuit ?

    Not so. The switching frequency is determined by U1.
  20. WHONOES

    BUCK switching waveform ... problem

    No, the waveforms shown are quite normal. The circuit shown is a Synchronous Rectifier type where the normal diode is replaced with Q2. Q2 would normally be on when Q1 is off. The output ripple can be caused by a number of things. Parasitic capacitance of the inductor windings. This allows the...
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