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  1. Alec_t

    Hall effect controlled fuel injector

    A fuel injector usually requires a high current pulse to get it to open quickly, followed by a reduction in the current to a holding level to keep the injector open for the required time without overheating its coil. There are dedicated ICs availble which facilitate this, e.g. LM1949, TPIC44L01.
  2. Alec_t

    Slip up!

    Hopefully CRC contact cleaner, not CRC silicone lubricant?
  3. Alec_t

    Voltage Regulation for charging Supercapacitor

    Here's a primitive regulator which might suit you :-
  4. Alec_t

    Voltage Regulation for charging Supercapacitor

    What picture? Use the 'Upload a file' button to post it here. A schematic of your setup would be helpful.
  5. Alec_t

    Voltage Regulation for charging Supercapacitor

    What is the mystery voltage source? What limits the charging current? Does the cap have a rated maximum charging current?
  6. Alec_t

    Cheap linear actuators

    Hiding something you don't want your other half to know about? :).
  7. Alec_t

    How do I get the switch off a SHARP microwave?

    Welcome to EP! Model? Picture? Post more info and someone here may know how.
  8. Alec_t

    Cheap linear actuators

    Well, we don't know what the platform size is or what is to be placed on it. The jack wouldn't have to be the size of a typical car jack :). I agree, strings and pulleys would be an option.
  9. Alec_t

    Square wave signal with ADC converter

    Why can't you use the micro's ADC directly to sample the voltage and deduce the peak value (if that is what you want) from the measured samples?
  10. Alec_t

    Cheap linear actuators

    A scissor-jack movement could work with a single motor.
  11. Alec_t

    Cheap linear actuators

    If you're going to use two motors you might need a toothed belt or other link to synchronise their rotation, to avoid the platform tilting.
  12. Alec_t

    N channel Fet v npn

    If you have only 3V to control the FET gate then the FET must be a logic level type with a Vgs(thr) well below 3V to ensure the FET turns on fully.
  13. Alec_t

    Cheap linear actuators

    The units in that link look just the job. I would have suggested the same method.
  14. Alec_t

    Flushing my Toilet

    What's wrong with the usual hand-operated lever/button?
  15. Alec_t

    Help me understand a 12V SLA charging circuit.

    Agreed, but why deliberately design something to run at higher than rated values (unless, of course, this is to ensure the unit fails just outside the warranty period :) ) ? Perhaps a 22Ω resistor was cheaper than a 75Ω one :).
  16. Alec_t

    Help me understand a 12V SLA charging circuit.

    The relay installed has a 9V rated coil with a nominal resistance of 225Ω. R18 should be 75Ω if the relay coil is to be driven with the rated voltage and current. It is currently 22Ω (pointing to poor circuit design), so the relay has been driven beyond its rated values. The coil current through...
  17. Alec_t

    Electric throttle

    If you have dual systems and their outputs differ, how will you know which one is right and which one is lying? It's my understanding that commercial airliners have triple-redundant systems and a majority-voting arrangement to resolve any discrepancies. Bearing in mind the number of components...
  18. Alec_t

    Subscript / Superscript in Editor

    Nice one, Ian!
  19. Alec_t

    Help with Amica WiFi board circuit

    :confused: I can see only two MOSFETs. The IRF7351 is an N-channel type, so Q1A is correct. Q1B shows a P-channel type, so it can't be an IRF7351 if indeed it is meant to be a P type.
  20. Alec_t

    ECU unit

    I guess that would depend on the characteristics of your octopus circuit. I've never used one. But leakage might occur only when the semi is under normal working voltage/current conditions, which I don't think it would be when testing with an octopus circuit. Tough one. Another possible culprit...
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