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  1. Alec_t

    Help with compatability

    I've just had another look at the datasheet. You say that the model is a 2104-AR-100. From the attached section of the datasheet, if I'm reading it correctly, the 'AR-100' designates the output features as Analog/relay, dual relay, NO analog option, 12-24V supply. So presumably there is no...
  2. Alec_t

    Help with compatability

    The 1k would dissipate about 1/2 Watt.
  3. Alec_t

    Help with compatability

    The safest way to test the controller would be to connect a 1kΩ resistor between terminals 10 and 11 of the controller, set the meter on a range to measure VOLTS (over 20V), and measure the voltage between those terminals. You should get readings between 4V and 20V, depending what your...
  4. Alec_t

    Help with compatability

    Welcome to EP! That depends on the particular model and its jumper settings, from my understanding of the spec. What is the full product code? Which terminals are you using for output? If you're actually getting 4-20mA out, then that should be fine for the Watlow, which only 'soaks up' 6.2V of...
  5. Alec_t

    Powering an old smoke detector

    If you do tinker with that smoke alarm, don't forget it's mains powered and not isolated from the mains, so any part of it should be treated as LIVE and potentially LETHAL.
  6. Alec_t

    Capacitors

    For use as a coupling cap, as stated.
  7. Alec_t

    DPDT Latching switches

    How about the push-push switches here?
  8. Alec_t

    measuring the sound intensity of Ultrasonic Pest Repellent

    Does this help?
  9. Alec_t

    Capacitors

    Consider a couple of examples. 1) If a capacitor is used as a reservoir capacitor in a battery-powered DC power supply it will charge up to a peak voltage. If current is suddenly drawn from the supply, some current will be provided by charge in the cap and the cap voltage will drop until the...
  10. Alec_t

    Capacitors

    As no values are specified the only discernible difference is where tthey are connected in the circuit. No, to put it simply. It all depends on the circuit and what purpose the capacitor has in the circuit. Even cost or physical size constraints can play a part in choosing a capacitor value...
  11. Alec_t

    Marks dog door

    A much safer option would be a pet door which is pivoted and has a locking catch which is released by the presence of a coded tag on Fido's collar. This type is available off-the-shelf.
  12. Alec_t

    Marks dog door

    You will also need some way of preventing your dog from trying to pass through the doorway when the door is only partly open ;).
  13. Alec_t

    Help making remote control LED lights

    Conventional wireless doorbells might suffice. They usually have a selection of channels and tunes/tones. The sounders could be replaced by LEDs.
  14. Alec_t

    Simulating electronics on a PC

    +1 for the LTspice recommendation. For simple circuit sims with visual indications of current etc you might also find this tool handy.
  15. Alec_t

    Help making remote control LED lights

    What is the maximum distance from a meeting room to the monitoring point?
  16. Alec_t

    PLease help usa GE walk dont walk timer/sign repair/use????????

    The label does confirm the 110VAC, unless you're missing a power brick (AC to DC adapter)? It's odd/confusing that the instructions refer to "+ Person" and "+ Hand" though.
  17. Alec_t

    PLease help usa GE walk dont walk timer/sign repair/use????????

    Are you sure that module needs 110VAC? I think it is expecting two DC inputs: one +ve (orange) for the hand, one +ve (blue) for the person, and a common (white). The link says "1. Verify input voltage is within specified range on the back of the LED signal module before installation. Failure...
  18. Alec_t

    Newbie on a trimmer/trimpot watts and temperature for a laser driver

    I wouldn't recommend it. If you were to adjust the variable resistor to a low resistance value you would divert a lot of current through it and cook it. It would be better to make a constant-current source from a power transistor and use the variable resistor to control the transistor current...
  19. Alec_t

    Explain me how to make an "Electromagnet Solenoid" more powerfull

    A longer core would enable you to wind on extra turns. Magnetic field / pull is proportional to the product of current and number of turns so, if you keep the current the same the extra turns would help.
  20. Alec_t

    Gaming headset soundcard repair question

    Perhaps there's a fractured wire at the other end of the cable?
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