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  1. Externet

    Need help with my project ... Heating

    For a 1m x 2m target to be heated perhaps is better using warm/hot air, turned on by a relay from the Arduino led buffered output. To be portable, perhaps a car/motorcycle battery and a heating blower ? ----> https://duckduckgo.com/?q=12v+hair+dryer&t=canonical&iax=1&ia=images
  2. Externet

    Misprint HARMAN / KARDON Receiver?

    About 10 years ago, I went redface at a Fry's electronics store when I found a receiver faceplate with its silkscreen printed as "Harman/Kradon". (or something like that) Took a picture, but cannot find it now. Seems it was immediately recalled and corrected. I worked at a Harman factory...
  3. Externet

    Watts chart

    For only two plants, this should be more than enough, 14 Watts. ----> http://www.ebay.com/itm/225LED-Grow-Light-Lamp-Full-Spectrum-Blue-Red-Orange-White-Quad-band-Plant-Panel-/380792689599?hash=item58a90353bf:g:QQcAAOSwA4dWGHcz
  4. Externet

    3.85 V li-ion battery to replace 3 V lithium cell in bathroom scales?

    Just use two diodes in series... 4.2 minus 0.6 minus 0.6 = 3V +4.2--------|>|--------|>|----------+3V
  5. Externet

    Finding the smallest possible actuator, or a new solution. Help massively needed!

    I can see another simple way to accomplish the task, but at the first post we see one 'riser', no 7mm 'base'. Later we see three, a 7mm base Will there be multiple and more ? Will each riser have independent action/control, or all be simultaneous ? Will there be other adyacent chambers ? Were...
  6. Externet

    Finding the smallest possible actuator, or a new solution. Help massively needed!

    Adding to the questions above; the material rising/extending has to be metallic or not ?; how many cycles are expected as life time ; how slow or fast to extend ? I would put a cell phone micro motor (shaft horizontal) inside the 7mm diameter base and unwound a copper?* wire from its shaft...
  7. Externet

    electronic speed control for drill motor

    I still have one of these somewhere : ---->...
  8. Externet

    No Longer in distance sense

    Common device used to keep children within reach distance; typical brand is 'Guardian Angel' Same for luggage : ----> https://duckduckgo.com/?q=luggage+distance+alarm&t=canonical
  9. Externet

    I'm new here, looking for help

    Go to an appliance parts store. They should have the equivalent in perhaps Klixon brand, from their interchange tables. That thermoswitch allows current to flow when cold until the heated attached part reaches a preset temperature, then opens circuit. If you have an idea of what temperature...
  10. Externet

    Electromagnet with strength controlled by photoresistor

    Perhaps adapting one of these will be a better choice. You get the proper matched parts for a reasonable price : ----> https://duckduckgo.com/?q=suspended+globe+magnetic+toy&t=canonical&iax=1&ia=images
  11. Externet

    Building a rechargeable LED flashlight.

    Come on ! .... To build that rechargeable flashlight you will need the rechargeable cell(s), the LED(s), the circuitry, the switch, the magnet, the hook, and the hardest, a proper housing. Just buy one of these ---->...
  12. Externet

    Braking Resistor

    IF I understand correctly without an schematic, a braking transistor health is in risk to drive that much power. If the resistors are in series to the motor???, well, they will be on. A contactor as you say sounds to be a safer implementation. Troubleshoot/test the transistor, and the motor...
  13. Externet

    Smartphone transmission

    Nothing said about peer-to-peer nor receiving the video transmission somewhere standalone else. Video chat to be received with another smart cell phone via the service provider towers/systems...
  14. Externet

    Help with 3v relay

    Hoping there is not an undisclosed built-in diode paralleled to the coil, and being reverse fed...:rolleyes:
  15. Externet

    Smartphone transmission

    The smart telephone has a radio transmitter built-in. And there has to be an application as in real time video chat that will be received and displayed on another smart telephone that you have called to previous take-off.
  16. Externet

    Help with 3v relay

    The two AA rechargeable cells are likely 1.2V each. That sums 2.4V with no load. Still when fully charged, are uncapable of reaching 3V under load. If the relay is encapsulated, you will not see or able to weaken its spring. Try D non-rechargeable cells instead to confirm. The best option is...
  17. Externet

    59 ohm resistor

    Que pasaaaa Edddddd...:)
  18. Externet

    Help with 3v relay

    Welcome. The 3 Volts source in not capable of delivering the current that relay needs to overcome its spring * A weaker/weakened spring may help. If not, a power transistor stage powered by the same 24VDC supply of the solenoid may be necessary to do the relay activation. The same weak 3V...
  19. Externet

    Soldering iron trouble.

    I will add something unusual for all to know... :eek:"hot melt glue" is an excellent tip cleaner ! I found one type/formula of that glue that does not work, but most do a superb job. Found such by re-melting/removing adhered components with the hot iron.
  20. Externet

    59 ohm resistor

    Welcome. Use two 120Ω paralleled, or any values that sum your needs in series. Discarded switching power supplies or other equipment may have suitable values. Canibalize.
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