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  1. (*steve*)

    i need someone to look at this circuit before my teacher will get it

    Clearly Dave has been reading our forums and has posted a video on this topic. Watch him complain about all the same stuff :-D
  2. (*steve*)

    mppt charge controller

    Generally speaking you have a buck or boost topology switch mode converter controlled such that you deliver the maximum power to the load. In the case of charging a battery, the output voltage will be held relatively constant, so the power is proportional to the current. Changing the duty...
  3. (*steve*)

    capacitor testing for novice please

    Whilst it is often quoted that a high voltage is required for testing leakage, at least one person (with a lifetime collection of faulty capacitors!) has determined that leakage can be measured at low voltage. Google "Mister Carlson's lab capacitor leakage". The videos and the circuit may...
  4. (*steve*)

    capacitor testing for novice please

    An ESR meter won't measure leakage, and leakage is likely to be the major issue for old high voltage capacitors.
  5. (*steve*)

    capacitor testing for novice please

    The yellow one is dead. It has high leakage. Just guessing, but if anyone is offering odds, I'm sure they favour that position.
  6. (*steve*)

    Switching between two batteries.

    You have 1.2V batteries. Do you have any idea what the forward voltage drop of the thyristors is?
  7. (*steve*)

    Does mAh rating of a battery affect the device at the same rated voltage?

    The "engineer" is making excuses.
  8. (*steve*)

    Unified power source

    Half wave rectified AC is harder to filter than full wave rectified AC. Use either/both larger filter capacitors and regulators on the output.
  9. (*steve*)

    Help with circuit design

    An inverter is the logic device that produces an output state opposite to the input.
  10. (*steve*)

    Comedy Thread

    Certainly not one leading an active lifecycle.
  11. (*steve*)

    circuit breaker switched off from distance ?

    I suspect the answer is no. Of course if your neighbour works for a three letter agency and you are an agent of an enemy state then all bets are off. But outside this, I would investigate: Intermittent earth leakage from something (assuming the breaker also incorporates earth leakage...
  12. (*steve*)

    Simple power supply that can be embedded in a wall socket

    The primary purpose of the resistor is to act as a fuse for when the capacitor eventually fails. :-)
  13. (*steve*)

    Hello from London

    Welcome Sir Kit. When you're finished in this thread, come up and meet us at the round table. A squire will be appointed to you. Oh, and welcome to Electronics Point :-)
  14. (*steve*)

    Equivalent Circuits

    In fact, since this is a linear circuit, showing that the output of both circuits is equal at any two different points is sufficient to show that it is the same at all points. Short circuit and open circuit are the conventional points to test because they are typically simpler. There's no...
  15. (*steve*)

    Ramping signals with op amps?

    As you have noticed, if the gain is set correctly so that the output voltage changes by 1.5V for each 1V change in input, you won't get 5V output for a 3V input. In order to get the correct gain, and to have the output voltages match, you need to offset what the op amp thinks is zero. If the...
  16. (*steve*)

    Ramping signals with op amps?

    If you want a change in input of 1 volt to produce a change in output of 1.5 volts, then the gain is 1.5. If that is the case, the output will be at zero volts when the input is at 3 - (5 / 1.5) volts. Therefore, you need to provide a -1/3 Volt bias.
  17. (*steve*)

    Equivalent Circuits

    For the purpose of the question, equivalence is determined by what happens at the output.
  18. (*steve*)

    Equivalent Circuits

    What is their open circuit voltage and short circuit current of each?
  19. (*steve*)

    Are these in parallel?

    The exception you suggest does not exist. So, are they in parallel or not?
  20. (*steve*)

    Comedy Thread

    Nice timing. I am currently introducing my wife to TOS. after they beamed down somewhere she predicted someone would die. I said "no, they're safe, nobody is wearing a red shirt". She looked at me as if I had horns. And why is Kirk wearing a green shirt?
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