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  1. Audioguru

    Coronavirus transmission prevention device.

    Last night i looked but I did not see the meteor shower.
  2. Audioguru

    Coronavirus transmission prevention device.

    The lockdown has caused air pollution to be much less than before. Yeah, the virus is thinning the herd, only the strong (and smart) humans will survive.
  3. Audioguru

    Coronavirus transmission prevention device.

    Many Super-Spreader occurrences happened all over the world when people crowded around at religious gatherings. Aren't the crowded beaches in Florida religious gatherings? Yesterday I drove past a "Halal" food store that had hundreds of "different" looking people outside in a lineup passing the...
  4. Audioguru

    Coronavirus transmission prevention device.

    The church pastor who kept his church open because "god will save us" has died of the Covid-19 virus. Now most of his church-goers have the virus. Trump has a golf course and hotels that are closed. He want to ...., never mind.
  5. Audioguru

    Searching for Solder

    My hands have not turned black from handling solder with lead in it all my life and my soldering iron has controlled temperature so it does not incinerate the rosin making smoke, instead it makes a pleasant aroma. The many guns in the USA might cause all the shot people to have lead poisoning...
  6. Audioguru

    Question CR2032 battery

    My Duracell Ni-MH batteries are made in China and my Energizer ones are made in Japan. Guess which ones are poor quality and leak?
  7. Audioguru

    Question CR2032 battery

    If you use a cheap battery that was made "over there" then of course it will leak. High quality batteries are guaranteed not to leak.
  8. Audioguru

    Question CR2032 battery

    The datasheet for an Energizer CR2032 says "Lithium / Manganese Dioxide (Li/MnO2)". "They are guaranteed not to leak or they will replace your device". They have a "Do Not Eat It" warning. 8 years storage life.
  9. Audioguru

    Question CR2032 battery

    There two qualities of batteries: 1) Good ones made by name Brand companies in Europe or North America. 2) Cheap ones made by no-name-brand companies in China. Guess which ones leak.
  10. Audioguru

    Frustrated

    Many foreign electronics YouTube videos and websites "over there" have many errors. Some Instructables confess that they are made by a 10 years old kid who knows nothing about electronics.
  11. Audioguru

    Frustrated

    How can anybody understand what the guy in the video is saying?
  12. Audioguru

    Frustrated

    Breadboard circuit always look like a tangle of wires all over the place. You cannot which connects to what.
  13. Audioguru

    Dual DC motor wiring help

    Nothing limits the current to the LEDs so they will instantly burn out. 30,000 RPM is a VERY high speed, isn't that when the motor has no load? Then when loaded, the RPM of the motors and speed of the car will be much less than you calculated the gearing to do.
  14. Audioguru

    does anyone understand microphone wiring

    Cheap switches like that have silver contacts so that they can pass come current. What happens to silver? It corrodes and turns black but high current burns off the corrosion and no problem. A microphone does not produce a high current so the corrosion prevents the switch from shorting away the...
  15. Audioguru

    Dual DC motor wiring help

    Yesterday I stood on the rear axle of a shopping cart and rode it downhill fairly far in the parking lot. No brakes and no steering! Yes, it was FUN.:) My RC airplanes pulse the motor as a warning when the battery voltage is becoming low then shuts off the motor (but allows the servos to work...
  16. Audioguru

    Dual DC motor wiring help

    The over-powered car might do a wheelie and the boy falls out the rear on his head. Or the sudden acceleration might break his neck I wonder how quickly the motors, wiring and speed controller will catch on fire. The car was designed for much less current. Don't do it.
  17. Audioguru

    Understanding my mysterious power supply

    If the output current exceeds the setting of the current-setting dial then the power supply reduces the output voltage until the current is what you set, according to Ohm's Law. The LED lights as a warning that the current is limited and the voltage is reduced. Example: Set the voltage to 30V...
  18. Audioguru

    bmw dvb-t2 tuner

    I think it is an LED and it or its resistor is intermittent.
  19. Audioguru

    Ebike battery

    Reviews are also easily faked.
  20. Audioguru

    Phase Shift Oscillator Puzzle

    Here is a simple Cmos squarewave oscillator using an MM74C04 which is the same as a CD4069. It has a fairly low output current. A 74HC04 can be used with reduced resistor values if you want and it has a higher output current but it might get hot. An even simpler Cmos Schmitt Trigger squarewave...
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