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  1. crutschow

    Diode substitution

    Generally yes, but it would be good to know what the diode is being used for.
  2. crutschow

    Low voltage drop diode

    What will you use the diode for? For certain applications MOSFETs can be used as diodes with very low forward drop, equal to the current times their on-resistance.
  3. crutschow

    RL Filter for a Grid side converter in a Wind turbine

    Well your big problem, as noted, is you can't use an RL filter for power filtering. Until you resolve that, all the other problems are moot.
  4. crutschow

    RL Filter for a Grid side converter in a Wind turbine

    What is the purpose of the filter?
  5. crutschow

    Mechanically latched solenoid?

    What does the solenoid do? How large is it?
  6. crutschow

    Can I replace cr2032 powered devices with AAA or li ion?

    But isn't it often used to find the keys at home? Why would you need it when you are out, where the keys are usually in pocket or purse?
  7. crutschow

    Can I replace cr2032 powered devices with AAA or li ion?

    It may be the receiver part, which always needs to be on.
  8. crutschow

    Can I replace cr2032 powered devices with AAA or li ion?

    Those are not rechargeable.
  9. crutschow

    Can I replace cr2032 powered devices with AAA or li ion?

    How about a CR123A 3V lithium? It has a 1500mAh capacity vs. the CR2032 225mAh rating, so should last at least 6 times as long. Alternately the largest coin cell is the CR2477 with a 1000mAh capacity, for about 4 times the life of the CR2032
  10. crutschow

    Op amp comparator troubles

    No. The LM2903 comparator (not an op amp) has an open collector output, so can operate fine with the output connected to a voltage different from its operating voltage. I suspect a wiring error. Double check all your connections as compared to the wiring diagram.
  11. crutschow

    Op amp comparator troubles

    The pull-up resistor (e.g. 10kΩ) needs to go to the +12V to turn off the P-MOSFET.
  12. crutschow

    Convert 1 phase to 3 phase by using an old washing machine

    The output frequency of those is much higher than 50Hz, so would not work to power the pump.
  13. crutschow

    Convert 1 phase to 3 phase by using an old washing machine

    I don't see anything from the washing machine that would generate enough power for your well motor. So you had three live power lines to your property from the power company, since that's the only way you could have 3-phase power? It's rare for a home to have 3-phase power. Are you sure it it...
  14. crutschow

    shaded pole evaporator fan motors

    But what airflow is the motor housing exposed to?
  15. crutschow

    shaded pole evaporator fan motors

    Since most of the mechanical energy goes into moving the air, which is then converted to heat, I fail to see how that would be a "small portion"?
  16. crutschow

    shaded pole evaporator fan motors

    But isn't there an outside air connection for the condenser? There's no free lunch. That mechanical energy is converted into heat by the fan moving the air, which heats the air.
  17. crutschow

    shaded pole evaporator fan motors

    I assume some of that is for the compressor motor that generates the cooling. And depending upon the design, the fan motor heat is likely dissipated in the outside air flow, not the cooling flow.
  18. crutschow

    Increase the amperage fo PNP transistor

    You only need two transistor to form a Darlington, why are you using three?
  19. crutschow

    Increase the amperage fo PNP transistor

    But that's not with the transistor in saturation. BJT's are typically specified for saturation with a base current 1/10th of the collector current.
  20. crutschow

    Increase the amperage fo PNP transistor

    For 350mA (not mAh which is battery capacity) through the collector, the base-emitter current should be at least 35mA. If your circuit cannot provide that much base current, then you will need to add another transistor (for example to make a Darlington stage).
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