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  1. (*steve*)

    Latching circuit with enable/disable latching mode.

    What is the nature of your input signal?
  2. (*steve*)

    Switching between mains power supply and 12v solar system

    The best solution is probably an MPPT regulator with a max output voltage above that of your DC supply but below the max for the cameras. If you isolate both using diodes, the solar panels will provide the most power they can with any gap being delivered by the dc source.
  3. (*steve*)

    Magneto Resistor Supplier

    I guess the simple answer is Panasonic who make the EZMPL series of devices. A magneto resistor is a resistor which changes value in response to a magnetic field. Interestingly they are often (apparently) used in a bridge arrangement to yield a voltage having some relationship with the...
  4. (*steve*)

    Hello, Welcome! (Introduce yourself)

    Hi fvuiya, welcome to Electronics Point.
  5. (*steve*)

    GY512 Diode

    I have just acquired a semiconductor curve tracer and a device for measuring the capacitance of semiconductor junctions. When it eventually gets unpacked and checked, I'm planning to see if I can duplicate the published values for normal (I.e modern, easily replaced) devices before I try it on...
  6. (*steve*)

    transistor equivalents

    Do you still have the zener diodes you removed? How did you determine what the replacement should be????? I asked you to measure the voltage across them in order to determine if the voltage reference was working. Now you've replaced them we cant do that test, unless you either read the part...
  7. (*steve*)

    transistor equivalents

    Did you measure the voltage across the zener diodes? I hope you didn't replace them... What about the diodes you replaced? What did you replace them with and why?
  8. (*steve*)

    Why is diode necessary in buck converter?

    But how would the stored energy get from the inductor to the capacitor without some path through ground? Draw the inductor as a battery with the positive terminal nearest the capacitor. (its actually more like a current source, but I assume you're not familiar with those)
  9. (*steve*)

    Why is diode necessary in buck converter?

    you need to review inductors. The reason is that there is energy stored in the inductor. The diode allows that energy to be dumped into the capacitor while preventing it from flowing from the cap back into the inductor.
  10. (*steve*)

    Why is diode necessary in buck converter?

    No, the current flow is from ground, through the diode and then the inductor to the capacitor. The diode is forward biased. It is reverse biased when the switch is closed.
  11. (*steve*)

    Why is diode necessary in buck converter?

    Draw an arrow showing the way the current is flowing through the inductor. Where does it flow when the switch is open (hint, the diode is involved)
  12. (*steve*)

    Why is diode necessary in buck converter?

    What happens when there is current flowing in the inductor and the switch is opened? Remember that you cant quickly change the current in an inductor.
  13. (*steve*)

    Easy Machine To Wind Transformer

    For an E core, you typically first wind the coil on a former then slide this on to the core
  14. (*steve*)

    Russian electronics help needed.

    Give it a try. If they're currently burnt to the point you can't read them, replacing them with a value that is too high (not saying 10k is too high, but that's the conjecture) is unlikely (I.e could, but most likely will not) to make things worse. And a reasonable general rule is that 1206...
  15. (*steve*)

    nRF24L01+ PA LNA - Seems that the PA (power amplification) portion of the module is failing?

    Do you have multiple ground pins on your module? Have you connected all of them to ground? Or maybe it is as simple as them having very dodgy soldering. Are they used in an environment that has lots of vibration?
  16. (*steve*)

    help connecting 555 timer

    If the sensors have a digital output (on or off) then you can use a fairly simple circuit to read them all at once and transfer them one at a time to a microcontroller (or whatever) then a 74HC165 may be what you're looking for. 1 chip for each 8 inputs and 3 data lines to your microcontroller...
  17. (*steve*)

    LED pucks getting hot

    Heh, I agree about the three LEDs in series, but there is no evidence of a resistor :-) (which is not to say there is not one)
  18. (*steve*)

    LED pucks getting hot

    Yeah, sounds like neither the LEDs or the power supply are current line limited.
  19. (*steve*)

    can't figure what the hell is wrong !

    A pain, but it's probably the best solution
  20. (*steve*)

    Proper procedure for reducing ripple on DC power rail? (e.g. oscilloscope reading -> filter design)

    Connecting the ground to the tip should give you a nice clean trace without noise. When you're measuring the noise in the circuit, connecting the ground to the right place is important if you have significant ground currents
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