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  1. (*steve*)

    At a resistance cut power

    What you want is a window comparator and tho either poised a known current through the resistor or to place it as one leg of a voltage divider. A window comparator detects a voltage between 2 limits, which can be set as close as you desire.
  2. (*steve*)

    It's 1890!

    1890 is a bit late for witch burning in most of the civilized parts of the world. But I agree on the technology bit. Sorta. Along with the sports almanac I would take a book describing the inventions of the 20th century and use my betting proceeds to fund an industrial scale R&D company. One...
  3. (*steve*)

    Help amplifying a tiny current

    Ok LED off, relay on :) That board should be fine up to about 30V ish. 5, 6, or 7.5 should not be a problem.
  4. (*steve*)

    Can I Modify this Relay switch?

    The original relay is NO (normally open). The replacement has NO pins which appear to be in the same locations. I recommend you measure the resistance between these pins without power connected to the coil (it should be open) and then with the relay energized (it should read closed). The new...
  5. (*steve*)

    Help amplifying a tiny current

    I believe he wants the relay to turn on when the LED does. Thus the SSR is between Vcc and the output (with a series resistor)
  6. (*steve*)

    Help me with LIN regulator Tester

    I really need to review each and every post by Colin. Sorry @Nikhilesh D R that I didn't do that earlier. He was being typically unhelpful.
  7. (*steve*)

    Help amplifying a tiny current

    This is what I would advise (note it's simply the first result for the search SSR, not a specific recommendation). Note that it requires 3-32V and 3 to 25mA which is waaaaaay less than your relay! So yeah, it will save heaps of current. 5mA vs 120mA? No question.
  8. (*steve*)

    Peltier cooler

    Lars, you need to be very careful with A and Ah -- they are not the same. It's like me giving you the capacity of a fuel tank in km/h or a speed in km. To get the current (A) of your peltier, divide the power (W) by the voltage (V).
  9. (*steve*)

    electromagnetism

    You would need to start reading the datasheets of SMD inductors. You'll need to find one that's "wound" the right way (I.e. The axis is correct) and has an open magnetic circuit (I.e. Is not manually shielded -- a toroid is unlikely in a small form factor) and can withstand a significant DC...
  10. (*steve*)

    Help amplifying a tiny current

    Yeah, and you would have only read half the post. Don't you love autocorrect.
  11. (*steve*)

    Help amplifying a tiny current

    A lot of excellent replies while I was sleeping. I was heading along the path of a PNP transistor (which is just the evil twin opposite of an NPN transistor). This will require a base resistor. On hearing the load you are switching, a solid state relay (SSR) is also exactly what I would...
  12. (*steve*)

    Help amplifying a tiny current

    Do you want the relay energized when the led on that module is on or off?
  13. (*steve*)

    electromagnetism

    An inductor with an air core is not going to make a good electromagnet. An inductor with a toroidal core will not act like an electromagnet (neither will one with any other form of closed magnetic circuit). An electromagnet will be designed with sufficient resistance to limit the current when...
  14. (*steve*)

    Help amplifying a tiny current

    Is it behaving better?
  15. (*steve*)

    Hello Everyone

    Not much, just kicking back in Ludhiana
  16. (*steve*)

    Help amplifying a tiny current

    2.12V is really low. can you try the circuit you have using a stiffer 3V supply, say 2 x AA batteries?
  17. (*steve*)

    Help amplifying a tiny current

    ok, the next step is to connect the battery to the relay and read the voltage across the battery when it is connected.
  18. (*steve*)

    Help amplifying a tiny current

    It's best not to edit your posts to add stuff because we don't get notification and it becomes harder to read the thread. It would be useful to get some information about the "temperature switch". The circuit you've drawn *may* be ok, but since it doesn't work there's more we need to know.
  19. (*steve*)

    Peltier cooler

    Alternatively, you can start with an insulated container and some ice. The problem with peltier cooling is that you need to get rid of the heat generated by the peltier as well as that taken from the cold side. Let's say you have a 12V 2A Peltier device. You need to get rid of 24W of heat...
  20. (*steve*)

    Help amplifying a tiny current

    This may be helpful.
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