Jul 19, 2010 · Yes, you're right. I want to use the headphone jack on the laptop to drive the speakers. I was just wondering why the audio amp chip works best with a high impedance connected to it's headphone jack, but when nothing is connected (i.e driving the internal speakers) it works fine with the ~4Ohm internal speakers.

Jul 15, 2007 · my laptop can split the desktop between 2 screens, but i have to configure alot of stuff to get it to "clone".oh, my laptop is a acer aspire 3000, the only probs i have with it are the fact that the speakers have blown, and the battery life …

Jan 8, 2025 · When the reference voltage was less than 2.5 volts, the LED was lit, but dimly. I had "guessed" that this was because there was a slight leakage current through the TL431. When I increased the reference to 2.5 volts, the LED was lit normally. I left the reference set at 2.5 volts and disconnected the power. Then removed the 1k pull up and the LED.

Nov 21, 2024 · Hi All, This is a silicon Full Wave Bridge Rectifier and I shot all 4 diodes with my DMM. I'm getting .488V drop through each diode. I was expecting something much closer to .7V. Does anybody think .488 is a bit low and may warrant replacement? Thank …

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May 5, 2012 · Take each laptops requirement of voltage & current: most modern ones are 18-20+V @ 1.5-3A. Think diode drops as "spacers" 1N5400s are ~ .8V @ 3A, 1N5420s are ~ .2V @ 3A (schottky). I'd start with a couple more 5400s (And one set of 4X5420s) than it should run on... the lowest reliable voltage / current yields lowest power (duh).

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May 12, 2011 · When I get too warm the phone may back down or temporary terminate charging until things cool down. This is a common problem with large battery smart phones that can be 1200 to 1800 mAH batteries. (5.5v - 3.2v)/ 1000 mA charge rate produces over 2 watts in series pass device in phone that will heat up the phone's internal series pass regulator.

Dec 31, 2024 · Good day everyone. So, I'm working on a project of an automatic irrigation system using Arduino Mega 2560 and RTC DS3231, using an ILI9488 TFT 4 wire SPI communication screen for the interface. So far, everything works perfectly when simulating with Proteus 8 (but since there's no ILI9488, I...