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  1. (*steve*)

    ECG, IRF, 2N Transistor

    IRF and 2N (along with BC, TIP, 2SA, and numerous others) are just the prefix part of the manufacturers part number. On its own it gives you very little information (some tell you more than others. 2SA tells you more than 2N, but not much). The next part of the part number tells you enough...
  2. (*steve*)

    Solid State.

    I have no idea what you're talking about. (Don't bother explaining unless you have some factual basis for what you say)
  3. (*steve*)

    HOW TO ID-- A 12 VOLT ZENER DIODE --ONE WATT --

    No, I said that those the size of the small glass diodes are typically 400mW, with 1W zener diodes being larger.
  4. (*steve*)

    HOW TO ID-- A 12 VOLT ZENER DIODE --ONE WATT --

    I've just got a clip-on macro lens for my current phone. It cost less than $5. It's not great quality, but in the centre I can easily use it to read tiny writing on small devices.
  5. (*steve*)

    HOW TO ID-- A 12 VOLT ZENER DIODE --ONE WATT --

    Well, the first thing is to determine if any are zener diodes. The small glass diodes, if they are zener diodes are typically 400mW or so. 1W zener are a little longer and almost twice the diameter. But remember that the are many package types. If you can make out what is written on the...
  6. (*steve*)

    How ic fabrication is done?

    Designed, or manufactured? There's a big difference.
  7. (*steve*)

    Power adapter voltage drop/load

    Switch mode wall warts will output the rated output voltage under no-load conditions, and it will remain constant up to the maximum load. Wall warts with a transformer inside them often have a no-load voltage much higher than their nominal voltage. This will drop as the load increases, with...
  8. (*steve*)

    HOW TO ID-- A 12 VOLT ZENER DIODE --ONE WATT --

    Get 2 9V batteries, a 10k resistor and a multimeter. Connect the negative of one battery to the positive of the other. Connect one end of the resistor to one of the unused battery terminals. Using your multimeter on a DC voltage range, connect the probes to the other unused battery terminal...
  9. (*steve*)

    I cant find TL494 on my proteus 8 pro

    I googled for that exactly and the first two hits apparently had downloadable libraries for this part.
  10. (*steve*)

    I cant find TL494 on my proteus 8 pro

    Did you try googling for "Proteus 8 tl494"?
  11. (*steve*)

    Power adapter voltage drop/load

    Connect up a 7809 regulator. If it works, great. It is possible that under load the output voltage will drop to 7V under load, and this may be insufficient for the scope.
  12. (*steve*)

    is this correct!!! or there is any other way?

    Find a datasheet for the breaker. It might operate indefinitely at 25A, it it might break within some period of time at 25A. You need to know what it's supposed to do before you can start thinking about his to test it.
  13. (*steve*)

    Can anyone ID this inductor and the manufacturer?

    I'm not certain it is wrong, but it's not a value I'd expect to see. I'm pretty sure the 22uH inductors I have are marked 220, so your reading is also reasonable. I'm curious as to why the existing inductor can't be soldered back in place. Perhaps the pad has been ripped off (in which case a...
  14. (*steve*)

    Finite state Machine

    Level crossing/ boom gate controller. Air lock controller Bascule (or other moveable) bridge, gates and warning lights controller
  15. (*steve*)

    LCD 1602 or HD44780 mistake connect pin 1 to 5V

    It depends on what the other pins are connected to. Reverse polarity on Vcc and ground, and the Co gets hot, probably dead chip.
  16. (*steve*)

    Can anyone ID this inductor and the manufacturer?

    Yeah, I agree 22mH is unlikely. 22uH seems far more likely.
  17. (*steve*)

    Thevenin equivalent circuit

    No, this is the homework section. You show us what you've tried and we'll try to help you figure out what you did wrong.
  18. (*steve*)

    Thevenin equivalent circuit

    See if you can find a way to simplify the circuit. You have a voltage source with a series resistor. What can you convert this into? Does this suggest another conversion you can do? What about the current source? The resistor in question can be "absorbed" by one of these transformations as...
  19. (*steve*)

    computer problem

    I would beware of just trying any antivirus software you hear about. There is an awful lot that is actually malware. Google it first and find out if it is legit and then download it from an official source.
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