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  1. Externet

    I don't understand the meaning/relevance of output impedance.

    ----> https://en.wikipedia.org/wiki/Electrical_impedance ----> https://www.wikihow.com/Calculate-Impedance Somehow, the impedance unit was decided to be named also Ohm. It could had been whatever else, like 'acres' or 'blurb' , but we are stuck to Ohms, as in the Ohm's law. Do not let that...
  2. Externet

    I don't understand the meaning/relevance of output impedance.

    The output impedance rating is the one that will deliver more power transfer. You can connect 600 Ω speakers and it will work, but delivering much smaller power. Anyone who talks about the impedance of a device, MUST express "at such frequency". It does not happen. Marketing is who usually...
  3. Externet

    Car Radio Overheats, sound go out. Second radio same problem. Need help

    Disconnect all speakers at radio rear. After a while on, check if gets hot. No? --> Connect only one, any. Try for a while. Check if radio gets hot. No? -->Then connect another. Try for a while. Repeat... The one causing overheating has bad wiring or a problem. Are speaker lines fed...
  4. Externet

    What is name of this component? Thx b4

    Led array typically used as battery charge status indicator in tools Lithium packs.
  5. Externet

    1960? B.C. (before cassettes)...

    Found it. Its name is the Dictet. ---->https://www.ultimate-guitar.com/articles/features/little_piece_of_history_12_weird_and_forgotten_audio_formats-79216
  6. Externet

    Ok To Bridge Left & Right Channels Together?

    It will work fine as per schematic. Two of these And one of these
  7. Externet

    VU meter

    Or, Spk(+)----------|>|-------------/\/\/\/----------------VUmeter-----------------Spk(-) Potentiometer will need to be calibrated to read 0 VU at the level of your choice.
  8. Externet

    1960? B.C. (before cassettes)...

    Thanks. Took some effort but captured images, at time stamp ~33:28 on ----> Shows an indentation for pinch roller ?
  9. Externet

    Driving assist in modern automobiles...

    Some vehicles implement braking and adjusting speed from sensing traffic ahead. It that by optical, imaging recognition ? Or is it by radar that should work in fog ?
  10. Externet

    1960? B.C. (before cassettes)...

    Hi. Saw yesterday on an old television program, a short-lived audio tape recorder format NOT open reel-to-reel, NOT '8-track' type of recorder and tape cartridge, before the 'compact cassette' by Philips. Was not a wire reel either. May have been a Hollywood trick of the era, but I do faintly...
  11. Externet

    LED strips underwater

    What do you call 'short circuit' ?
  12. Externet

    LCD screen to wide ribbonImage control PCB

    Does not matter what kind of IC it is, you cannot probe traces for diagnostics, you cannot as a human replace it without million $ equipment, and the part is not available in quantity one from the corner store selling parts. To repair a broken trace you must be a magician, not a technician. It...
  13. Externet

    Charging a phone battery

    Then use that LiPo charging board you prefer for your phone 'battery' , which is not a battery, it is a single cell, and find out your way to mate the contacts. If you have the leftovers of your damaged phone, cut off and use its plastic craddle with proper contacts installed inside your...
  14. Externet

    Charging a phone battery

    ---->...
  15. Externet

    Charging a phone battery

    Check if there is (+), (-) polarity markings in the phone.
  16. Externet

    Charging a phone battery

    Determine which terminal is positive if not marked; apply +4.00 Volts and no more to it, and minus to (-) for a couple of hours.
  17. Externet

    Current rise in 12v pump

    Are you shutting off a tap at the suction hose end ? If so, the outlet pressure cut-out is not sensing pressure reached; will not turn off the motor unless the motor itself has a protection that trips after a while drawing 4 amperes.
  18. Externet

    Music playback

    ---->...
  19. Externet

    Low voltage indicator lamp of 110vac circuit

    If you plan to run light gauge cable; cat3+ cable is cheap and could provide several conductors for signaling, even control a remote relay to turn the thing on/off from inside the house. If the concern is running the well dry, a float switch in series could take care of that.
  20. Externet

    Led Disco Lights

    Led lamps on 230V may have a delay to turn on, messing up the intended effect. What is the behavior if you install one incandescent and the rest LED on each channel ?
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