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  1. Alec_t

    2N2222A

    Then get googling.
  2. Alec_t

    Using this magnetic sensor as a wakeup sensor

    I think R19/20 could each be at least 10k without any adverse effect. If you use the LMV324S, it has a shut-down feature which would conserve a bit of energy.
  3. Alec_t

    Printing on cartoon box with industrial printer

    That would depend on several factors, e.g the programmer's skill, EM screening, electrical noise in the vicinity, power outages, supply decoupling, cooling, component tolerances and stresses, ........
  4. Alec_t

    Using this magnetic sensor as a wakeup sensor

    Typically, but only for the 1021/1022. Which IC do you have? Probably. Then the 10mA figure would relate to a supply voltage closer to the maximum.
  5. Alec_t

    Using this magnetic sensor as a wakeup sensor

    There's no way you can reduce the IC's10mA per bridge current requirement significantly. Can't you use a different IC? It doesn't look suitable as a wake-up sensor, unless you are really forced to sense very low magnetic field strengths.
  6. Alec_t

    Printing on cartoon box with industrial printer

    And your definition of 'best' is ........? Most reliable, easiest to program, simplest to service, ...... or what?
  7. Alec_t

    Automatic watering

    More info needed. Water pressure? Flow rate? Using moisture sensors, timer? Budget? Electronics experience?
  8. Alec_t

    Help with circuit

    Depending on the inductance of the solenod, 50ms may not be long enough to allow the current to build up sufficiently for the solenoid to pull in.
  9. Alec_t

    Relay That Toggles On & Off With No Hold Current

    I bet the relay module shown requires continuous current to keep it in one of its two states :(.
  10. Alec_t

    9v oscillator to dc motor

    Welcome to EP! If you had a DPDT relay you could eliminate the H-bridge :). A relay with a 5V rated coil should operate correctly at 5V. Sounds like yours is incorrectly rated or faulty.
  11. Alec_t

    Fix A Noisy Refrigerator

    What sort of noise? Rattle, buzz, hum, squeal, squeak ...... ?
  12. Alec_t

    Help with a very simple rc circuit..

    I think you'll find the base current needed to switch the transistor fully on will drain the cap rather too quickly, unless the transistor is a Darlington type..
  13. Alec_t

    Cheapest bank checks?

    Surely cheques other than those from Bank of America won't work for debiting your Bank of America account?
  14. Alec_t

    Building an analogue wind direction meter

    Agreed. Otherwise there could be a 180 degree ambiguity. I wonder if a tunnel closed at one end but with a non-axial vent might do the job, like this : Any aerodynamiciists out there to confirm if air-flow inside the tunnel would be different if air externally, of a given speed, were in...
  15. Alec_t

    Building an analogue wind direction meter

    Perhaps a bit of non-linearity of directional response when using an array of sensors would be no big deal for the TS's purpose. A bit of signal processing could probably correct it to some extent if required. I was thinking a bunch of thermistors in respective 'tunnels', differently oriented...
  16. Alec_t

    Building an analogue wind direction meter

    Then they will all be cooled the same amount. Ok if you are interested only in wind speed, but how would this arrangement enable wind direction to be determined? I think you'd have to shield them so that they are exposed differently.
  17. Alec_t

    Help with a very simple rc circuit..

    Here's an alternative :-
  18. Alec_t

    Mouse over image to zoom USB-LCD-Detector-Voltmeter-Ammeter-Power-Capacity-Battery-Current-Meter-Te

    Welcome to EP! The green thing is the circuit whose current/voltage is being measured.
  19. Alec_t

    Facing problem in 0 to 5 v furnace control

    Welcome to EP! Then probably there's a software bug or a wiring error. Can you post your schematic?
  20. Alec_t

    Panasonic cordless phone kx tg4441 unable to receive incoming calls

    Welcome to EP! Have you checked the battery is ok? Can you make calls?
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