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  1. (*steve*)

    Beginner question : 555 timer pin 4

    Perhaps you should read the thread from the beginning.
  2. (*steve*)

    Beginner question : 555 timer pin 4

    The capacitor in series with the resistor means that the 120Ω resistor only dominates until the capacitor charges.
  3. (*steve*)

    Beginner question : 555 timer pin 4

    Aaaagh. If you're doing that, it may pay to place a 120Ω resistor in series with a 100uF capacitor in parallel with the thermistor. That will ensure that the fan starts at full speed. It may help if you find the fan doesn't start at all on a very cold day.
  4. (*steve*)

    Beginner question : 555 timer pin 4

    You don't need the voltage regulators. You can just compare the voltage you let from a potential divider using a thermistor with that obtained from a trimpot. In both cases you are comparing the ratio between a voltage and the supply rail. The comparison remains valid even if the supply rail...
  5. (*steve*)

    Timer circuit wont turn off V output

    My bet is that you have the MOSFET around the wrong way. Thus, when it is on, it is on; when it is off, conduction is via the body diode.
  6. (*steve*)

    My brand new oscilloscope

    And some more information about it.
  7. (*steve*)

    My brand new oscilloscope

    As you all know, I'm a sucker for "new" test equipment. How's this: It only has a few faults: The beam doesn't focus very well The focus changes over time Changing the X gain changes the X position slightly The cal signal doesn't seem to work The graticule illumination seems non-functional...
  8. (*steve*)

    fluctuating magnetic field generator design

    There are a bazzilion ways to do what you want. See here for one. If you can't give us any more details then I will probably close this thread.
  9. (*steve*)

    fluctuating magnetic field generator design

    How about 0402 inductors?
  10. (*steve*)

    Something zapped it

    I'd it possible that the cause of the fault also cleaned the beer out of your fridge and filled your bin with empties?
  11. (*steve*)

    Circuit design

    Multiply all the values by 1. That should be close enough.
  12. (*steve*)

    Heartbeat/pulse lighting effect

    Check this out. You'll have to figure out the synchronisation though.
  13. (*steve*)

    Identify blown IC without circuit diagram

    If you're really lucky, the top of the IC will be rattling around in the case somewhere. You may be able to read some markings.
  14. (*steve*)

    Td(on) and Td(off) parameters of a MOSFET

    Googling for "mosfet td(on)" is a remarkably good start. See here. Page 8 has the information you require.
  15. (*steve*)

    Td(on) and Td(off) parameters of a MOSFET

    Without a dataset to refer to, Td probably refers to the time between the gate voltage changing and it's effect on the channel.
  16. (*steve*)

    How an electromagnet can calculate kilogram

    A Kiligram is a kilogram in any gravity field (whereas a pound is not). Kg is a measure of mass, lb is a measure of weight. The force could be exerted perpendicularly to the gravitational field.
  17. (*steve*)

    How to use up hi voltage power

    Your question doesn't make any real sense. You need to tell us more about what you are trying to do, rather than trying us how you think it should be done if you want useful help. A literal answer to your question is "a 12.25kΩ resistor"
  18. (*steve*)

    Can anyone identify this chip?

    It looks like a voltage regulator to me too. I'd recommend you determine if one lead is connected to ground, then measure the input and output voltages in operation. It's not unusual for voltage regulators to run quite warm, but if you find the output voltage drops over time, this may be an...
  19. (*steve*)

    New components tests, vs Old components tests

    They're not diodes. That comment reads as an insult coming from someone who knows little and directed toward those who seek to help you. I would be very careful about buying the hand that feeds you.
  20. (*steve*)

    Question contact slot and contact conector snes

    I don't think there's any meetings in the argument that you need to use it once a month. If it has a rechargeable battery on board, that might be a reason, but not for capacitors. Store it with a cartridge plugged in, and don't removed it. That way there won't be any additional wear to the...
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