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  1. Alec_t

    Pulses to flow rate in kg/h

    Flow rate = 100mS/measured-pulse-period kg/hr.
  2. Alec_t

    Security for Newer Vending Machines

    Considering the relatively low speed at which the typical spiral rotates, there is almost certainly a reduction gearbox between the spiral and its motor drive. This means that to force the spiral to rotate you would have to overcome very high frictional torque. But as the spiral is symmetrical...
  3. Alec_t

    Hep needed to ID vintage tube

    Looks like a double diode.
  4. Alec_t

    How to connect a newer Shaded Pole Motor in my oven?

    Welcome to EP! The old motor has only two male terminals; so does the new one. Their physical positions on the motor do not matter. Just tape/tie the existing group of three wires (top of the picture) together and connect them to one terminal. Tape/tie the existing group of two wires (bottom of...
  5. Alec_t

    Securing LED to heat sink?

    Just take care not to short the + to the - with the heatsink!
  6. Alec_t

    Display instability for temperatore sensor

    What is the power supply for the device? Perhaps the device is sensitive to supply variation.
  7. Alec_t

    Fast Switching Relay for High frequency Signals

    What application requires you to switch a power amp on or off in 'a few uS' ?
  8. Alec_t

    Fast Switching Relay for High frequency Signals

    Do you mean the change-over time of the relay contacts must be fast, or energising the coil results in almost immediate contact closure, or the relay will be activated repeatedly in a short time?
  9. Alec_t

    Gcse project NEED HELP

    When doing the maths for this project, bear in mind that LEDs will have a longer life if run at a current less than their rated maximum current. Reduced current will also give a longer battery life.
  10. Alec_t

    Bee venom collecting device

    The freeware simulator LTspice, from Linear Technology.
  11. Alec_t

    Boxes. Cases. I need simple coverings for my projects! What do you use?

    Plastic cable trunking, available in various sizes, can be used for housing small projects.
  12. Alec_t

    Interfacing a NTC thermistor to a PIC

    No. An analogue circuit to do that would be complex. Much easier to do linearisation in software.
  13. Alec_t

    Need cover housing for a speaker of 30mm

    As dave suggests, container lids? The lids of plastic milk bottles here are ~35mm ID.
  14. Alec_t

    Power won’t turn on

    Welcome to EP! Not many of us own a crystal ball :rolleyes:. You'll have to provide a lot more detail. Model? Power supply voltage/current rating? Have you tried using an alternative, correctly rated power supply? What exactly happened between it working and not working? Has it been...
  15. Alec_t

    What circuit makes a HIGH by detecting LAST pulse

    A re-triggerable monostable circuit should do the job.
  16. Alec_t

    Sewing machine power supply/capacitor blown up

    Good to hear.
  17. Alec_t

    Sewing machine power supply/capacitor blown up

    My interpretation of the PME code number is that it's a X2 type 68nF metallised paper cap, 275VAC.
  18. Alec_t

    Logic mosfet pwm

    You should really be driving the LED with a controlled current, not a fixed voltage. What is the rated maximum current for that LED? Can your power supply cope with that current? Is the LED mounted correctly on a BIG heat-sink?
  19. Alec_t

    Sewing machine power supply/capacitor blown up

    The yellow label in the last pic has 'C104' on it, which could relate to a 100nF capacitor. Can you show us the whole label?
  20. Alec_t

    LED light: 120V and 25watts vs 12Volts and 25 watts: whats the difference?

    Your horse must be lame :).
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