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  1. (*steve*)

    Standard Incandescent Bulb Salvaging

    I wouldn't try to recover solder from circuit boards either. You don't know what mixture of soldered you'll get. Aside from the flux issue mentioned previously, your recovered solder will be a mix of potentially many types of solder. It's not impossible to get a mix that is unsuitable for use...
  2. (*steve*)

    Low power distance detection

    A 1MHz difference in clock speeds at 900MHz is indistinguishable from a relative velocity of about a million kilometres per hour. Of course that velocity is unlikely, but even tiny changes in frequency can introduce huge errors. How will you know it takes 1000 rising edges to reach the...
  3. (*steve*)

    Low power distance detection

    Much of your theory is wrong. Especially that part concerning the effect of frequency drift and the required wavelength. I'll expand later when I'm not on a phone.
  4. (*steve*)

    Standard Incandescent Bulb Salvaging

    And I bet you're going to tell me that all the hair I've been collecting from hairbrushes isn't going to be useful either! It's made of GOLD I tell you! (More like silver in my case...)
  5. (*steve*)

    Standard Incandescent Bulb Salvaging

    If about as special as the aluminum used in the ring pulls on soft drink cans.
  6. (*steve*)

    Problem in inverter circuit

    Bad designs are like conspiracy theories. The more arguments there are against them, the more people hear about them. And if so many people are trying so hard to suppress them, they must be really good!
  7. (*steve*)

    Hello, Welcome! (Introduce yourself)

    Hi Matt,. A warm welcome from the city furthest from you.
  8. (*steve*)

    Low power distance detection

    The problem is that drift in the clocks would be indistinguishable from them moving with respect to each other. Also, if you have many of these devices, you're far better off having a few independent transmitters than each one of these devices transmitting to each other. In theory, if you have...
  9. (*steve*)

    Transistor pair to switch between Voltages

    Using N channel mosfets like you have, the power can't be switched off. The current will be conducted through the body diodes. You are high side switching. Use P channel mosfets. You currently have resistors R2 and R4 pulling the gates low. Change them so they pull the gates high. Then use...
  10. (*steve*)

    Using a MOSFET instead of a BJT

    That's really low speed. I wouldn't be too worried about the speed of switching. Also the current is well within the capability of the device.
  11. (*steve*)

    Using a MOSFET instead of a BJT

    It seems a reasonable option, however with such a low Vgs(th) the turn off time may be longer than you expect. What frequency is this operating at, and what is the peak current demanded by the load?
  12. (*steve*)

    Transistor pair to switch between Voltages

    That circuit will always have 12V present at the output. Also the LEDs across the Schottky diodes will never illuminate. You should use P channel mosfets, and if the purpose of the LEDs is to show the activity of the 5 or 12 volt channels, place the LED between the Schottky's anode and ground...
  13. (*steve*)

    Signal amplifier

    What is the instrument you are connecting this signal to and what is the output level from your headphone output? Will the headphones be connected? Do you require an accurate level signal? I.e. does this instrument measure the amplitude of the signal or something else?
  14. (*steve*)

    Electronics vs Temperature

    Be careful, them might be fighting words. :-)
  15. (*steve*)

    Problem in inverter circuit

    It must be terribly discouraging to get an answer you don't like in one forum, post on another forum, only to get the same person giving you the same advice. :-D
  16. (*steve*)

    MLI using IR2110

    Draw in the body diodes for the mosfets and you'll see the problem. I prefer using symbols which have the body diodes shown for this very reason.
  17. (*steve*)

    detect solids levels in a box

    Have you considered an ultrasonic range sensor like an HC-SR04? You might want to use several so you can detect the vertical rather than slant distance.
  18. (*steve*)

    Electronics vs Temperature

    "For every 10°C rise in temperature the lifetime of semiconductors is halved." Whilst I'm not sure you'd want to bet your life on this statement being exactly correct, the correlation exists. At high temperatures, ions are far more mobile and can migrate to places where they'll do bad things...
  19. (*steve*)

    Soldering wire to metal

    Hopefully you are using solder with a flux core. If not, yes you will need flux.
  20. (*steve*)

    Low power distance detection

    Yeah, the advantage of GPS over your proposed method is that accurate clocks are not required at the receiver end.
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