DATE OF CLOSING

Started by Guillermo Rodriguez in sci.electronics.basics2 days ago

I WOULD LIKE TO KNOW WHEN THE SCHOOL CLOSED?

I WOULD LIKE TO KNOW WHEN THE SCHOOL CLOSED?


Controlling alot of LEDs from Arduino or AVR. Maybe 74HC595

Started by Sid 03 in sci.electronics.basics2 weeks ago 4 replies

I am trying to create a project much like like a Marquee sign, I want to be able to control hundreds of LEDs from a set of chips. From my...

I am trying to create a project much like like a Marquee sign, I want to be able to control hundreds of LEDs from a set of chips. From my research I found the 74HC595 chip and using a bunch of these would probably work, but it would be nice if I had the ability to change each intensity of each LED like each LED pin had its own PWM controller on each LED ? Is there a chip-set out there t...


Why A DC to DC Converter Will Not Increase Range of the $3 Voltmeter Either

Started by Bret Cahill in sci.electronics.basics3 weeks ago 2 replies

Guessing that there was no clever end run around the 30v maximum I tried a DC to DC converter set to 15v then measured the voltage between the...

Guessing that there was no clever end run around the 30v maximum I tried a DC to DC converter set to 15v then measured the voltage between the +38v and the +15v. Instead of 23 v it jumped around all over the place then settled on 3.x v. A cap between the terminals might not work either and may due to the fluctuating current short out the converter.


Why the $3 Voltmeter Cannot Work With Inline Resistance

Started by Bret Cahill in sci.electronics.basics4 weeks ago 1 reply

The lowest voltage it can measure is what powers the LED display so something must be acting like a DC to DC converter set at the display...

The lowest voltage it can measure is what powers the LED display so something must be acting like a DC to DC converter set at the display voltage. Additional resistance in series lowers the current too much to power the display. It only works on an ideal voltage source.


Jus Run the Voltage Backwars Thru a 8 v Battery

Started by Bret Cahill in sci.electronics.basics1 month ago 1 reply

The Fieri light runs on 4 rechargeable cells 2p X 2s. Just wire it so that the voltmeter always gets 8 volts less than the ebike battery.

The Fieri light runs on 4 rechargeable cells 2p X 2s. Just wire it so that the voltmeter always gets 8 volts less than the ebike battery.


Converting a $3 / 30v Voltmeter to A 45 v Voltmeter.

Started by Bret Cahill in sci.electronics.basics1 month ago 6 replies

The impedance is 100k Ω. Put a 50 kΩ resister in series with the voltmeter and map out the correction.

The impedance is 100k Ω. Put a 50 kΩ resister in series with the voltmeter and map out the correction.


220k Resistor Does Not Werk On 100 K Voltmeter

Started by Bret Cahill in sci.electronics.basics1 month ago 2 replies

Hit just flashes. Furst guess is not enuff nano amps gits thru that yuge resistor. I ben very luky in that California no longer picks up toxik...

Hit just flashes. Furst guess is not enuff nano amps gits thru that yuge resistor. I ben very luky in that California no longer picks up toxik elektrikal stuff. But all I got is 2 resistors wif leads, .24 Ω and 220K Ω.


Cheap Voltmeter Doesnt Fry Over Voltage

Started by Bret Cahill in sci.electronics.basics1 month ago

It simply loses linearity. At least up to 38 v where it reads 36 v. Who cares?

It simply loses linearity. At least up to 38 v where it reads 36 v. Who cares?


Free Energy or Energy Storage

Started by Tobias Gadelha in sci.electronics.basics2 months ago

Hi Dears, I watched this video and I'm very curious if this is a really storage or fake. I know that free Energy don't exist but this energy...

Hi Dears, I watched this video and I'm very curious if this is a really storage or fake. I know that free Energy don't exist but this energy storage is real? Video Youtube https://uii.io/Energy__Storager


anti-music "remote control"

Started by Eli the Bearded in sci.electronics.basics3 months ago 3 replies

https://www.vice.com/en/article/jg8wnb/square-dancing-noise-china Residents who are fed up with the noise from China's ubiquitous ...

https://www.vice.com/en/article/jg8wnb/square-dancing-noise-china Residents who are fed up with the noise from China's ubiquitous "dancing grannies" are resorting to a special device that could mess with the speakers that blast out loud music. They use an infrared remote control dubbed "anti-square dancing magical device" to silence the noisy dancing troupes that have ...


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