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  1. Alec_t

    Laptop lid sensor...

    That prompted me to look for the lid-close-sense magnet on my Lenovo Z50-70. It's at the bottom left corner of the display area.
  2. Alec_t

    guest connectcharge inlet

    We're not psychic :rolleyes:. Which two wires? We need more info about the switch and the counter. The charger manual should identify any relevant connections. Welcome to EP!
  3. Alec_t

    I want to make DC-DC voltage booster

    Suppose your modem draws 0.5A from a 12V supply. For any converter, power (current x voltage) out is less than power in. If you made a DC-DC converter to boost, say, 5V to 12V then the current drawn from the 5V supply would be more than 0.5A x 12/5 = 1.2A.
  4. Alec_t

    Unknown SOT23 - need help identifying

    Those meter readings suggest that the device is internally shorted, if it's out of circuit; or else give no useful indication of device properties if it's in circuit in parallel with low impedances.
  5. Alec_t

    PWM - Potentiometer ohm importance...

    That marking could indicate either a linear or logarithmic taper pot, depending on manufacturer and country of origin. You probably need a linear taper pot.
  6. Alec_t

    Hardware debouncing

    There are no Schmitt inputs on that expander.
  7. Alec_t

    How to use DC power supply to power AC powered appliances?

    You can't, unless the appliance will work with both AC and DC. Welcome to EP!
  8. Alec_t

    Fluctuating ADC Reading for 4-20mA Pressure transducer input

    If the UNO has a 10-bit ADC, the fluctuation is an error of ~1%. Noise on the ground rail could account for that. How close is the UNO ground connection to the 250 Ohm ground connection? Are you using twisted pair or screened cable for the inter-wiring?
  9. Alec_t

    I need someone to help identify the layout of this board.

    The problem may not be caused by the power button itself, but rather by the electronics which checks whether the button has been pressed. If the button is the normal 2-contact type you could try temporarily shorting the contacts together. If that switches the monitor on, then at least you know...
  10. Alec_t

    PCB MKL90W-02-C1 / 0500-0515-2180

    Maybe it's a camera artifact, but it looks as though the left-most coil of that 4-coil filter LF2 has a fried part at the top?
  11. Alec_t

    PCB MKL90W-02-C1 / 0500-0515-2180

    Welcome to EP! It may be a surge limiter rather than a capacitor. What are the board markings underneath it?
  12. Alec_t

    Missing Edit & Cancel Options on Posts

    Would a Captcha thingy keep them out?
  13. Alec_t

    How to make my thermocol incubator marketable?

    'Low cost' is indeterminate, but choice of material and cost would depend on what is obtainable in your area and, if you have enclosures manufactured for you, the number you order.
  14. Alec_t

    Easiest way to send a control pulse to a latching solenoid, for esp32/arduino

    Welcome to EP! How much current does the solenoid draw? How long is the 'short' pulse duration? What now provides the 16V? Are both pulses applied to the same input terminal of the solenoid? Does 'quad' mean there are 4 solenoids?
  15. Alec_t

    Noob seeking circuit advice - if 0v then 2.5v otherwise 0-5v

    Does that mean the closer to zero the faster the motor? If so, as Whonoes says, the problem ain't simple to solve.
  16. Alec_t

    volume/frequency activated gates/triggers

    LM3915 is obsolete, but may be still available somewhere.
  17. Alec_t

    Cannot connect to my router

    It will be cheaper to buy a new router than getting it fixed.
  18. Alec_t

    Cannot connect to my router

    Sounds like a faulty unit, unless it has some enabling/disabling function.
  19. Alec_t

    Help with an inductive heating circuit!

    I think the slugs would heat up and consume energy intended for the target. Is this a school/college project?
  20. Alec_t

    Back emf?

    The diode should have a current rating similar to the peak current that the motor draws.
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