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  1. Externet

    EMF Detector

    Electro magnetic field detector schematics : ---->https://duckduckgo.com/?q=emf+detector+schematic&iax=1&ia=images
  2. Externet

    50Mhz Square wave generation.

    Should be a couple of $ ----> http://img.alicdn.com/imgextra/i1/44075510/TB2qdSUaNfxQeBjSspjXXX4opXa_!!44075510.jpg
  3. Externet

    Stop false alarms

    False alarms are the headache of all security providers, as bring them out of their 'comfort zone' reading newspapers, having coffee, chatting and perhaps napping waiting for the phone call to act. False alarms are fought with past experiences and location/equipment used. I would say an 'AND'...
  4. Externet

    12v Wind turbine

    Get a 'whatever-volt-in' to a '14 volt-out' DC converter module for the power matching your generation set. Something like ----> https://www.aliexpress.com/item/QH86-LM2577S-LM2596S-4-35V-To-1-25-25V-DC-DC-Step-Up-Down-Boost-Buck/32772795058.html
  5. Externet

    How to power a phone with no battery

    Welcome. Make a dummy battery from a piece of wood or plastic with the exact dimensions and terminals to fit in the phone and bring their connection out to a 3.7V regulated wall adapter capable of the maximum current the phone may need; observe proper polarity. Perhaps 200-500 mA
  6. Externet

    ford GEM, detect if door is ajar

    Installing an additional reed/magnetic switch to the door(s) could leave alone and separate the GEM from your I/O device; ensuring longevity for both and to sleep well. ----> https://www.aliexpress.com/wholesale?SearchText=alarm+window+reed+magnetic+switch&opensearch=true
  7. Externet

    Optical Pickup

    Explore the use of a laser instead of infrared wide beams... Optical CD readers work well on reflection of tiny pits.
  8. Externet

    Portable Amp

    Many flavors at any musical equipment distributor : I have seen as small as a pack of cigarettes. ----> https://i.ytimg.com/vi/jSfLpa_B4SU/maxresdefault.jpg ---->...
  9. Externet

    Optical Pickup

    Yesterday I repaired an optical smoke detector. It has the assembly as you describe, with the proper mounting cradle for the IR emitter/receiver. Now, to optically read a vibrating string; perhaps you have ideas, project has merit, go for it. I do not know if a string will produce an useable...
  10. Externet

    Display prototype

    Pick your flavor of choice: ----> https://duckduckgo.com/?q=digital+photo+frame+keyring&t=canonical&iar=images&iax=1&ia=images
  11. Externet

    Faulty Popcorn Machine

    The heating element being healthy but not reaching temperature points to check the thermal limit switch or thermostat being faulty or its connections being not tight. Should be in series to the heating element. They look alike the one at third row, third column : ---->...
  12. Externet

    Ant Detecting Sensors

    It is so simple and common that did not find a suitable tutorial. Perhaps this ? ----> With extras at the right column. Take it as a customer entering a store chiming by interrupting a light beam by the door. Very shrunk to ant size.
  13. Externet

    Ant Detecting Sensors

    Forgot a computer, display, keyboard, operative system... ?
  14. Externet

    Faulty Popcorn Machine

    Hey Miguel ! Well, there is a hidden secret. Just in case, popcorn machines need to use only the corn variety that pops. Other common corn kernels do not. ;) Yes----> https://www.gimmesomeoven.com/wp-content/uploads/2009/08/popcorn-kernels.jpg No---->...
  15. Externet

    Ant Detecting Sensors

    Optointerrupters can detect them. Even count them passing by their tubular paths. There is several sizes to fit. ----> https://duckduckgo.com/?q=optointerrupters&t=canonical&iax=1&ia=images
  16. Externet

    Float Charger

    The manufacturer of the voltage/current regulator IC recommends the use of a capacitor in its data sheet for better behavior under input spikes or ripple.
  17. Externet

    Specific IC s used in solar circuit

    The LDR recognizes dark/lit ambient. The solar panel on a garden lamp does it too. Why do you need two ? To design the IC, make the solar panel double function and eliminate the LDR. ----> https://ez.analog.com/community/university-program/blog/2014/11/14/hacking-an-led-solar-garden-light...
  18. Externet

    Specific IC s used in solar circuit

    - Boosting/regulating the voltage from the solar cell to the charging voltage/current required by its 'battery' cell. - Turn the charging off when dark - Turn the LED on when dark - Turn the LED off when sunny. - Turn the LED off when dark if 'battery' is discharged.
  19. Externet

    magnetic switch/connector

    Yes, you can separate them. Each copper 'wrapper' has its wire. Wire1------------------------------------[magnet]/[magnet]----------------------------------wire2
  20. Externet

    magnetic switch/connector

    Never seen such already built, but where is the mystery ? Or a cylindrical magnet that fits inside a piece of copper pipe. Two of them. They will still attract/repel. Wires soldered to each copper pipes will
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