Search results

  1. Externet

    Is this possible to do?

    Put a red? > 50mA led in series to either one MagicJack wire ? That I have not tried. Should lit when in use; off then not. -no zener- Come back with results/findings... ;)
  2. Externet

    Is this possible to do?

    Yes, very possible to implement. I did that 40+ years ago, hanged the led on the ceiling where was seen by personnel in a charity/philanthropy office that had only one telco landline and like 4 paralleled telephones to desks... But works in reverse: When line is available (not in use), led is...
  3. Externet

    Relay Type?

    Try the buzzer alone to 12VDC. If works, connect the switch in series, no relay. (-)------------12V-----------(+)-----------------C switch NO---------------red buzzer black ---------------(-)
  4. Externet

    Circuit to Spike 24Vdc then go to 0V

    Put a capacitor in series. When 24VDC is energized, a pulse will appear at the other capacitor terminal. 24 VDC----------------------||-------------------------24 VDC spike The capacitor value and the load resistance to the spike determines how long the spike will be. time = RC
  5. Externet

    Help needed - bilge pump alert

    The 'best way' for me is no light consuming no electricity and no relays, no more wiring, no splices, no more circuitry, no more contacts, no more switches... A tiny hose tapping at the pump discharge flow routed to an empty bottle above the sludge area. If you find water in the bottle, is...
  6. Externet

    Old module does not work

    I would replace the door actuator/servo with a 12V light bulb for test purposes and to rule out mechanical bindings.
  7. Externet

    What type li-ion battery use in cordless power tool protected or unprotected

    The 18650 is not a battery, it is a lithium cell that when using multiple wired in a pack become a battery. A lithium battery is usually protected; has circuitry that prevents mishaps and abuse in charging and discharging. When such circuitry is implemented, cells do not need to be...
  8. Externet

    Fat laser beams...

    Hi. Perhaps title should say 'Fat beam lasers'... Has anyone played with them ? From curiosity, bought a couple to evaluate. Chinese cheap DPSS; supposed to be 50mW at 1.8V / 300mA, ~14mm. Aiming for a 1 mile range beam visibility at night. Do you think that power will do it ? Blue presents...
  9. Externet

    Reduce LED Brightness

    Feeding LEDs with AC may become lethal to them. I would replace your 24VAC supply with a 5V usb (phone) type of wall transformer available at many forgotten drawers and evaluate brightness.
  10. Externet

    power supply to 1,5v (clock) AND 3v (LED)?

    +5 V -------------------|>|----|>|----|>|-----------------3V------------------|>|----|>|---------------1.5V Feed the 5V from a USB supply adapter to series of plain diodes as 1N400x to obtain 3 and 1.5 Volts.
  11. Externet

    50cm floor fan troubleshooting

    Check continuity in the wires entering the motor and continuity in the wires at the speed selector switch Some have a thermal protector in a 'spaguetti' tube joined to the motor windings that often fails open circuit. The switch can fail too.
  12. Externet

    Refrigerator compressor...

    Hi. Please confirm if the way it works is : When applying 120V to arrows, the PTC starter is cold and passes current to winding S (start) in addition to current flowing trough winding M (main or run) A few seconds later the PTC heats up and conducts much less current to winding S. Being the...
  13. Externet

    modified clothing dryer for low heat function?

    I would insert a light bulb socket (mounted on back of dryer unit in series with one heating element wiring; and screw-in a light bulb of the convenient wattage to yield the temperature desired. For normal operation, screw-in a lead fuse with edison base. What happens if you force the dryer...
  14. Externet

    tube/cord for small wires

    The AWG rating will tell the current capability. In stranded cable version will be much more flexible than in solid wire version.
  15. Externet

    tube/cord for small wires

    Already made for wiring a household thermostat, or for telephone wiring if thinner awg22 works, Or stuffed vinyl hose as for fish tank available in many diametres at the hardware store; or a section of defunct garden hose... Cat4 ----> https://networkencyclopedia.com/category-4-cabling/
  16. Externet

    Electronic Knowledge required for laptop repairing

    Takes maaaany years of experience learning all of it. After all you have experienced and learned through all those years, the technology, components, assembly, architecture, construction has changed so much that you are forced to keep learning the new developments or abandon the intention...
  17. Externet

    Toasted windings in 3 phase motor...

    Generator in airplane.
  18. Externet

    Toasted windings in 3 phase motor...

    Thanks. All windings are 'carbonized' , the open failed solder is at one relay pin. No fuses, no breakers in the assembly; perhaps very externally. Military equipment. IF protection circuitry was triggered, it was in the 'Murphy's law style' : "Expensive equipment blows itself first to...
  19. Externet

    Toasted windings in 3 phase motor...

    Hi. Replaced a burned 2HP 400Hz motor and after dismantling wiring, found one phase wire at the power relay with open solder joint. Would that be the cause for the motor failure ? The overcurrent at failure moment could have also had melted the solder, right ? Any other probable reasons that...
  20. Externet

    Electronic Knowledge required for laptop repairing

    A laptop repair course should probably be renamed to "parts replacing" until works if it is hardware related, and "tamper with software" until works if programs / OS related. The electronics knowledge should be very basic as for chargers, fuses, batteries, wiring, connectors, multimeter use...
View older results
Top