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  1. Externet

    magnetic switch/connector

    Magnets wrapped in copper foil. Wires soldered to the copper.
  2. Externet

    Wall heater thermostat

    Look at the application notes and data sheet of the integrated circuit in order to properly modify the older to your requierements. If that is possible.
  3. Externet

    TV Device Question

    Did you read the "Product description" in that link ?
  4. Externet

    TV Device Question

    Welcome. Your television does not have a USB port ? Some that do can play videos. Some are just service ports. Read its manual. Does it have HDMI port ? Here is a gadget that may help---->...
  5. Externet

    what's this component??!!

    Seems the missing component is above the S/N bar code in first picture. What is printed on the smaller black component (resistor) in the second picture ?
  6. Externet

    New apartment getting shocked on light switch screws.

    Replace with nylon screws...
  7. Externet

    Connect remote TV to satellite cable

    Connect the new TV to its 'Ant' in jack from the 'RF' satellite tuner output jack. Or, if the tuner outputs composite or HDMI, feed those signals to the corresponding inputs of the new TV. On the new TV, the input used should be selected on its menu. Have you read the user manuals ?
  8. Externet

    Help needed about ICL7135 pinout

    Hi. The Altera chip TQFP does not have 'J' pins; it is meant to be soldered as a surface mount device. The 'J' leads in the Maxim PLCC are meant to use a socket but can also be soldered as in the video above. It is possible to straighten the 'J' pins to be soldered flat to pads in outer...
  9. Externet

    Help needed about ICL7135 pinout

    Hats off to your work, as always...
  10. Externet

    Connecting up very small, curved pins.

    Soldering "J" pins instead of using the socket ---->
  11. Externet

    Help needed about ICL7135 pinout

    Hola ! It may need this carrier ----> https://www.picclickimg.com/d/l400/pict/282309866260_/PLCC28-28-Pin-SMT-SMD-Socket-Adapter-PLCC.jpg or adapter board, looks like ----> http://www.beldynsys.com/Q28-32front.jpg They have trough-hole pins underneath. And some extra help ---->
  12. Externet

    Finding a good soldering iron....

    All soldering irons work. Some better for some uses, some better for others. Skills and experience are more questionable than the item itself. $1 irons or hundred$ irons have a place. Focus on your skills. To solder properly, the pad, the pin and the solder should be at the same heat level...
  13. Externet

    Help me design a water heater circuit that automatically turns-off when the heater reaches a boiling

    It is already designed, and available at industrial supplies, appliance parts places, and inside coffee makers. Come in maaany flavors. ----> https://www.alibaba.com/product-detail/custom-electric-heating-element-with-temperature_60460496077.html
  14. Externet

    Wireless ECG electrodes

    Get other opinions than mine, in other forums or professionals in medical electronics.
  15. Externet

    Wireless ECG electrodes

    "i guess those issues could be solved." Perhaps, with blood, sweat, tears and years. I would venture to say the expertise/expert you need is in medical electronics engineering. -Softwaring is not electronics- And too complex subject to tackle on a forum. Your "dont have the faintest idea...
  16. Externet

    Solar Based Handheld Led Light

    1.- A solar panel can work recharging any battery chemistry. 2.- Less charge time is done with higher charging current, which means more sunlight or more current yielding panel. 3.- Charging battery voltage + series diode Vf drop should be less that panel voltage output.
  17. Externet

    Wireless ECG electrodes

    Does not smell viable to me. A power source like coin cells on every adhesive probe, with a transmitter... Highly sensitive amplifiers to pick weak signals built in each electrode... Several adhesive probes transmitting in close proximity on the same band and the interference within themselves...
  18. Externet

    Help design a very simple momentary on/off circuit

    Use a push-on push-off switch ! Nothing simpler than that. ----> https://www.mgsuperlabs.co.in/estore/image/cache/data/MGSL/push%20to%20on%20off%20switch-500x500-500x500.jpeg
  19. Externet

    Solar Based Handheld Led Light

    A solar panel of about 12cm x 10cm could still be called handheld; and nine AA size Ni-metal cells also. There is cell holders for nine AA cells. The LEDs can be better series-parallel, each series string sum to be fed with 12V, the number of parallel branches you want. The Vf voltage/color...
  20. Externet

    How to make a mains detection unit using an optocoupler

    Done that, and as I was unable to find it on the market, took : - 1 phototransistor - 1 neon bulb - 1 resistor for the bulb - superglued together and - wrapped in black shrink tubing.
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