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  1. (*steve*)

    Whirlpool L1373 repair attempt

    Are you sure that the is not a mosfet or something that has failed short circuit? The resistor may be there to act as a fuse. Please post the schematic.
  2. (*steve*)

    Calculate radius of a copper wire

    Because we (the world generally) owe them an answer, and because being polite adds a few keystrokes and takes a few seconds that they'll never get back. The same argument applies to why they fail to read the bold print indicating what we will and will not do in this section.
  3. (*steve*)

    Driving this MOSFET with PIC

    I thought his claim was that a 2kV pulse would appear on the primary?
  4. (*steve*)

    How to measure the power of antenna (RF)

    Is this to compare antennas and then decide which one to use, or will the device have multiple antennas that it will dynamically chose from? If the former, you could simply try them one by one and see which one allows reliable control at the longest range.
  5. (*steve*)

    Bipolar Junction Transistor Configurations

    Whilst LvW's answer is accurate, a general answer would be that if the bias point is sensitive to variations in the characteristics of the transistor, then the biasing is likely to be unstable. An example would be biasing a common emitter stage using a high value resistor from Vcc to the base...
  6. (*steve*)

    Project Kickoff - Variable Frequency Generator WITH interrupts (gaps)

    I think the answer I'd give to that is to use a microcontroller. Starting out by prototyping something using an arduino would be a way to see how viable it is.
  7. (*steve*)

    Project Kickoff - Variable Frequency Generator WITH interrupts (gaps)

    I was going to replay that I completely fail to understand what you need. Then I decided that my response wouldn't be helpful so I deleted it. Then I decided to post something so that you know that if you don't get any useful replies there may be a reason.
  8. (*steve*)

    Mini Camera/LED/Power supply research project

    Congratulations. Not sure how this helps the OP though.
  9. (*steve*)

    160 KHz Oscillator Transmitter

    AM for 1600kHz, FM for 88MHz if you want to receive it on a regular radio.
  10. (*steve*)

    Mini Camera/LED/Power supply research project

    Let me try to remember all the questions.... That looks like 6V, not 12V. Yes, a resistor in series with the led is fine. Do you really want to use a green LED? For more light you can place a couple of LEDs in series with a single resistor. See out resource on driving LEDs for more...
  11. (*steve*)

    160 KHz Oscillator Transmitter

    160kHz, or 1600kHz? The former is very low frequency, the latter is at the upper end of the broadcast band.
  12. (*steve*)

    How do constant current loads work and how to make one

    Are you wanting to produce a load for testing batteries? If so, what is the maximum and minimum voltage you would want applied to it, and the maximum and minimum current you'd like to set it to sink?
  13. (*steve*)

    How to measure the power of antenna (RF)

    Or if it's the received signal strength you want to measure, provide a fixed gain to both, and compare the amplitude of the signals. Assuming the antennas have the same impedance, the amplitude week be proportional (not directly) to power. For received signed it's normally about the amplitude...
  14. (*steve*)

    MOSFET Sub-Nanosecond Switching

    Interesting. It was just a few days ago that I read about semiconductor devices using avalanche mode to increase the speed of electron flow in a junction, reducing the transit tine and thus increasing the speed of operation. I might go back to that text and read it again :)
  15. (*steve*)

    Ive just bought US$155,000.00 of test equipment :-O

    Here is a picture of a small amount of my haul that I either converted to 240V or otherwise checked today: I've done some other items, but I'm only now getting into the more interesting stuff...
  16. (*steve*)

    Driving this MOSFET with PIC

    OK, if it's purely resistive then I can't see how you get 8kV spikes unless you're powering it from 8kV. I can't see how the power rail would fall to zero, especially if it has a resistive load across it. And if it's resistive you can't charge it. Oh hang on, it's a flyback transformer...
  17. (*steve*)

    Capacitor charging

    I wouldn't bother. It's clear that the device tops out at 250V. We can tell that because you bought it and that was the rating of the capacitor. There's all sorts of stuff you could try. larger batteries (D cells instead of AA), a higher voltage (try adding one more cell), or even a voltage...
  18. (*steve*)

    Driving this MOSFET with PIC

    The internet is also full of graphic sex videos. The owner and moderators of this site have reached a consensus not to host information about weapons and other highly dangerous stuff. If it ever came up, we would also probably decide not to produce our own explicit sex videos either. Not all...
  19. (*steve*)

    Capacitor charging

    That's better, but remember that leakage exists even when there is a load. In fact it's a load all by itself. In many cases it can be considered to be a resistor in parallel with the capacitor.
  20. (*steve*)

    "random" blinking LEDs: purpose-built circuit, or Arduino or =

    He's coating them with something phosphorescent (and presumably with a long decay time)
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