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  1. Externet

    In search of a brain...

    My last brain transplant did not go well. They gave me a refurbished one. Not recommended... Am looking for a mechanism assembly that will release a string across a 3mm plastic wall. An actuator inside a hermetic sealed 'bottle'; the mechanism outside holding/releasing the string. -NO...
  2. Externet

    Magazines

    I had to let my complete Popular electronics magazine collection from volume 1 issue 1 let go to a friend when moved overseas. He did not take good care of it. Included the later Electronics now issues to about 1990. Same with my Popular science magazine, collection since about 1970. Huge...
  3. Externet

    Ohms law chart from radioshack.. vs ..home made ohms chart

    Am not as good as Radioshack; can you improve my home made triangles ?
  4. Externet

    Faulty Charging Circuit

    Correct. For the relay to deenergize, the transistor must stop conducting and for that to happen the output voltage of pin 1 must go to a lower than 0.5V. The change of pin 1 from high to low is commanded by comparing the voltages at pins 2 and 3. The resistors to the right of the IC create...
  5. Externet

    Faulty Charging Circuit

    On the schematic, pin 8 of the LM358p is supposed to be its Vcc supply for the IC to work. Has no supply. On the picture, appears fine, but pins 5,6,7,8 bridged ?
  6. Externet

    Faulty Charging Circuit

    To start without going deeper, are the top two pins in the schematic the relay coil ? The relay shows both coil pins bridged together to Vcc. If the coil pins are the central ones, they are also bridged. If that is the way it is built, it will never energize. The title for your post could be...
  7. Externet

    Sensor circuit

    ---->...
  8. Externet

    12 volt relay to start a 24 volt motor

    A relay with 12V coil is perfectly useable to power a 24V trolling motor. Just power the relay coil with 12V, which may be tapping only to one 12V battery.
  9. Externet

    Charger for 2S LiPo

    Change "needs to be charged at" with "can be charged up to". You do not push the throttle pedal to the floor all the time while driving, even when there is a couple of inches clearance left under it. Its 150 horsepower engine is its maximum power capability; not the typical 20HP it yields in...
  10. Externet

    Rechargeable torch explaination

    It is a 'feature' The charge controller has an 'enable' pin that allows to charge only if senses it is plugged in, and disables the lamp turn-on switch. Otherwise, most of the wall power would be used to turn the lamp on instead of recharging the battery in short time. It is a rechargeable...
  11. Externet

    The new types of IOT

    I can see the government telling to dump your car and buy a new one as any functional fart will be automatically reported to the smog check department.
  12. Externet

    Charger for 2S LiPo

    Cheapest ? Pick the flavor of your choice : ----> https://www.aliexpress.com/wholesale?SearchText=7.4v+lithium+charger&opensearch=true
  13. Externet

    Cell phone accepting external video ?

    Thanks. Yes, I was evaluating others alike : ----> http://www.ebay.com/itm/Micro-USB-Endoscope-Waterproof-Inspection-Camera-for-Android-OTG-Smart-Phones-/361533300065?hash=item542d105d61:g:feYAAOSw0QFXDSRM And unsure from the description if I can get real time video into an Android smartphone...
  14. Externet

    Cell phone accepting external video ?

    Hi. Anyone knows how to display a video signal on a cell phone screen in real time ? Point is to see a surveillance camera with sort of virtual reality goggles, NO internet involved, no video coming trough the air, just wiring-in a composite signal. In other words, using the phone as a monitor.
  15. Externet

    Question

    ----> Just call anyone on your cell phone and say nothing. Or text no typing. Radio operator licenses are the saddest joke. The idiot FCC mandates to inoffensive ham radio operators to have a license and 99.9% of illegal criminal content radio traffic is on cell phones that do not need license...
  16. Externet

    What trends of Electrical Engineering Market that will make good money in 5 years.

    Industrial robotics. Farming robotics.
  17. Externet

    Anyone know what this is?

    Minder : they are used for instrument panel illumination, blinkers/brake/rear lights burnt bulb monitoring, in other vehicle brands. They called those ´ĺight pipes´ My '79 GM vehicled surprised me having those.
  18. Externet

    How To Make A Up And Down Mechanism Like A Grabbing Machine By A Single Push Button

    Some clues : ----> http://www.instructables.com/id/Makeblock-Crane-Machine/ ----> https://duckduckgo.com/?q=crane+claw+parts&t=canonical&iar=images&iax=1&ia=images ----> https://www.moneymachines.com/cranemachineparts.html
  19. Externet

    Connecting two batteries to one phone through the case

    Paralleling two batteries of dissimilar chemistries/ages/capacities/wear/state of charge is not recommended, but, you can do whatever you want with your stuff. Bringing a wired connector out of the housing to use larger capacity cells can work, if the phone does not requiere sensing terminals on...
  20. Externet

    Looking for portable projector under $500

    I have an Epson EMP-74 ; if that is what you are after.
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