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  1. Alec_t

    Trans hum

    Another possible cause of hum is the common-mode choke at the input of the power supply. This gets pulsed at twice the mains frequency. One rated for higher current might reduce the hum, but its larger physical size would prevent it from being fitted in the supply.
  2. Alec_t

    LTC1050 to NJM2904D circuit

    This will tell you all. Whenever you propose to use an unfamiliar component, always check its datasheet.
  3. Alec_t

    Trans hum

    Can you confirm whether the LED dimmer is connected to the power supply input or output ?
  4. Alec_t

    German translation

    Courtesy of Google Translate :)
  5. Alec_t

    Air Pump

    Re post #8, I've just noticed that Google gave me info for the MAC9706. Could the component marking be that?
  6. Alec_t

    Air Pump

    Ok. Looks like the semiconductor is a 0.6A 400V sensitive gate triac. If it's fried, a suitable replacement (perhaps with a higher current rating) should be easily obtainable.
  7. Alec_t

    MOSFET burning up but similar circuit on another board is fine

    If the circuit layout differs in any way from the ok one, then perhaps the FET goes into spurious oscillation. That could account for excessive heating.
  8. Alec_t

    Air Pump

    What markings are on the semiconductor device (the black three-legged component)?
  9. Alec_t

    Ultrasonic Cleaner Isonic P4820 not working

    If it's a piezo transducer its impedance will be very high.
  10. Alec_t

    MOSFET burning up but similar circuit on another board is fine

    Why the caps on the FET gates? They will slow down the switching action and increase the heat generated.
  11. Alec_t

    Help copying program from C167CR Chip

    Is the big blue cylindrical thing, top left in the last pic, a memory back-up battery or supercap? If so, is its voltage correct?
  12. Alec_t

    Is it possible to use two LED with a 3-pin non-latching Hall effect sensor?

    The size of the magnet is irrelevant: it's the magnetic field strength which is relevant. Any small modern magnet should do. You will need to think of a circuit to condition the sensor output to enable the LEDs to be driven. Depending on the circuit it will possibly require a supply voltage...
  13. Alec_t

    Is it possible to use two LED with a 3-pin non-latching Hall effect sensor?

    According to the datasheet, the drv50553 output as a function of the sensed magnetic field is like this :- This should give you a clue as to how you can distinguish the magnetic field direction. Note also that the output voltage range is 0V-1.8V for this field.
  14. Alec_t

    Square wave to DC level

    The circuit is unclear (to me, anyway). Can you post a schematic showing the divider and following components?
  15. Alec_t

    Current sensing circuit help

    That may be so, but the charger draws the current you are measuring (about 30mA) from a 50/60Hz AC mains supply, so the CT sees only 50/60Hz.
  16. Alec_t

    Capacitive Force Sensor Circuit Project

    It often helps to find a solution if we know the end purpose of the system. Exactly what will the force sensor and display be used for?
  17. Alec_t

    Solar Drone

    Welcome to EP! 0.5V seems very low for a cell, or is that a typo?
  18. Alec_t

    Help needed with a levitating speaker (its not levitating !!)

    Looks like there are 4 button magnets on the base. If these are easily removable, try reversing the magnet on the side that drops.
  19. Alec_t

    Three Tank Control System

    Sounds like you need valves with a wider bore.
  20. Alec_t

    Forgive my ignorance...

    The 12A current rating for that MOSFET applies only if you can heatsink it well enough to keep its base pad <=25C, which may well be near impossible in a practical application. I'd go for a FET with at least twice that rating.
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