I got a couple of these, to maybe cure UV-set...

I got a couple of these, to maybe cure UV-set epoxy. https://www.ebay.com/itm/High-Power-Purple-405nm-Pointer-Burning-Light-Beam-Pen-with-Battery-Cha rger-USA/383162483108?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649 It came with a big lithium battery and a charger. Two weird things: If I shoot it at a white wall, I can see the spot with my right eye, but not with my

Hi all, I have a device which is powered by a solitary 1.2V 800 mA NiCd cell. An AC wall charger (5VAC @ 180 mA) is used to charge the cell. ...

Hi all, I have a device which is powered by a solitary 1.2V 800 mA NiCd cell. An AC wall charger (5VAC @ 180 mA) is used to charge the cell. This is done via a simple half-wave rectifier that is built in to a small circuit board inside the device. The battery sees about 90 mA (true RMS). It seems strange to use a hard-to-find AC power source rather than a commonly available DC wall ada...

Every time I turn around I have to repair (or attempt to) some piece of crap. This time a Troy-bilt string trimmer (20V Lithium...

Every time I turn around I have to repair (or attempt to) some piece of crap. This time a Troy-bilt string trimmer (20V Lithium battery). Battery is good, motor is fine but what I thought might be a switch is a rather sophisticated circuit the has an 8 pin IC, quite a few passive components and an IRF3205 mosfet. This "switch" has a low resistance across the battery so it's shot.

My latest project is a battery management system (BMS) that can accurately measure cells in a lithium battery pack, and also perform shunt...

My latest project is a battery management system (BMS) that can accurately measure cells in a lithium battery pack, and also perform shunt balancing and possibly charge shuttling to balance the pack. I would also like to be able to use it for a pack of four 12V SLA batteries. A DG408 could be used to select up to 8 cell voltage taps from nominal 3.2V (LiFePO4) or 3.7V (Li-Ion), with a ma...

https://www.cnsnews.com/article/national/susan-jones/buttigieg-electric-vehicles-could-be-very-useful-during-power-outage Of course, EVs don't...

https://www.cnsnews.com/article/national/susan-jones/buttigieg-electric-vehicles-could-be-very-useful-during-power-outage Of course, EVs don't "generate" anything, they are just a big battery. At best, they can be called a "reserve power source." Of course, once you have drained the EV's battery it won't MOVE. Using it as a power source means it must be connected to the charger whic

Disclaimer: I'm not looking for the best drone power supply. I enjoy using high quality branded products. Of course it's all made in China....

Disclaimer: I'm not looking for the best drone power supply. I enjoy using high quality branded products. Of course it's all made in China. That is IMO a good reason to pay close attention to branding. I intend to pay VERY close attention to my battery pack temperature, and to take the endeavor very slowly. I have a spare Dewalt 20 V Max 6 amp hour battery, and a load of new 18650 bat...

OT: Solar Charging 12V Car Battery... My son, Aaron, software engineer turned farmer, has acreage in the San Tan Valley with no source of...

OT: Solar Charging 12V Car Battery... My son, Aaron, software engineer turned farmer, has acreage in the San Tan Valley with no source of electric power. He'd like some artificial light for his chicken coop to increase the egg output. Lighting and timers are easy to find off-the-shelf, but I need some pointers toward finding a good quality solar panel that can charge a 12V car batter...

I have a battery charger that is rated at 2, 15, or 100 amps. It's a Everstart WM-1510 ma model. (Walmart). I found that Schumacher has...

I have a battery charger that is rated at 2, 15, or 100 amps. It's a Everstart WM-1510 ma model. (Walmart). I found that Schumacher has an identical charger model SE-1510 ma. That says these Everstart chargers are made by Schumacher. Anyhow, the 12v circuit breaker has died and will not reset. That seems to be the most common problem on all chargers. My question is this. The Schu...

Marco Reps has an interesting article on low noise amplifiers: Ultralow Noise Tester: 9V Battery vs. 7805 vs....

Marco Reps has an interesting article on low noise amplifiers: Ultralow Noise Tester: 9V Battery vs. 7805 vs. LTZ1000 https://www.youtube.com/watch?v=XpbDMo8an5w - uses ADA4523: $3.030 Mouser, Digikey, 4.2 nV/sqrt(Hz), RRIO, 100pA Ib - Datasheet https://octopart.com/search?q=ada4523 Cross-correlation would improve noise floor. Hard to get down to Gerhard's level, but maybe doable. ...

Could some electronics guru please shed some light on this ? Several Web sites(please check list below) have schematics and flashy color...

Could some electronics guru please shed some light on this ? Several Web sites(please check list below) have schematics and flashy color photographs of single white led light powered off a single 1.5 Volt AA battery. http://cappels.org/dproj/ledpage/leddrv.htm http://www.electroschematics.com/6195/high-efficiency-led-with-1-5-volts/ dinspirations.com/appliedcontent/Projects/Proj-WhiteLED...

LONG BATTERY LIFE - High-powered battery combined with low-energy LED lights provides up to 60 hours of non-stop light up playtime. The Cipton...

LONG BATTERY LIFE - High-powered battery combined with low-energy LED lights provides up to 60 hours of non-stop light up playtime. The Cipton Impact-Activated LED Golf Ball remains lit for 5 to 8 minutes after first impact, with a strong LED light visible from 100+ yards out. Light up your Golf game with spectacular color-changing LED lights any time of day with the Cipton Illumini

I am wiring up 4 banks of batteries with dip40 pin & zif. Considering 4 battery banks: Min 360V, Max 400V _A_ _B_ _C_ _D_ 370 380 390...

I am wiring up 4 banks of batteries with dip40 pin & zif. Considering 4 battery banks: Min 360V, Max 400V _A_ _B_ _C_ _D_ 370 380 390 400 400 390 380 370 connected with X ohm at Y duty 1. what Z AWG do i need? X Y Z 1 10 5 25 10 50 ohm % AWG 2. What is the equiv. W AWG for pin headers and 3M zif sockets Z should be < W Y can be lower

This and a second assembly plant in Tennessee are a huge investment. Looks like most of the money is coming from SK Innovation, a South Korean...

This and a second assembly plant in Tennessee are a huge investment. Looks like most of the money is coming from SK Innovation, a South Korean giant that supplies EV batteries for a multitude of automotive manufacturers. https://www.reuters.com/technology/sk-innovation-invest-43-bln-us-battery-production-with-ford-m otor-2021-09-27/ https://www.wkyt.com/2021/09/27/ford-build-electric-vehicle-

i just want to remove the battery body and let my phone boot normally. but no luck, when i removed it and plug in usb power, the...

i just want to remove the battery body and let my phone boot normally. but no luck, when i removed it and plug in usb power, the phone boot but seems like low power and shutdown. thank

Bit of electronics for a change, 800V automobile systems cicuits ...

Bit of electronics for a change, 800V automobile systems cicuits https://www.electronicdesign.com/markets/automotive/article/21249715/power-integrations-whats-d riving-evs-to-higher-battery-voltages What's Driving EVs to Higher Battery Voltages? Electric-vehicle makers are turning to 800-V systems to solve range and charging time issues that have created barriers with consumers and slowed

Great AA/AAA Battery Test 2022 by Gough Lui https://goughlui.com/ Could you ask Gough Lui to use the same number of cells by brand name for...

Great AA/AAA Battery Test 2022 by Gough Lui https://goughlui.com/ Could you ask Gough Lui to use the same number of cells by brand name for tests not promoting 100 Amazon Cells, since Amazon is not brand name for AA or AAA cells and stays for seller. So limiting number of cells for tests to 2 pieces we don't have to test 316 cells 23 x 2 = 46 reducing testing time 6 times Inje

Just stick a needle in it to release the pressure. There are more than a few such videos on YouTube.

Just stick a needle in it to release the pressure. There are more than a few such videos on YouTube.

This is way worse than any electric car situation could ever be...

This is way worse than any electric car situation could ever be...

What do you folks think about this gem: https://www.youtube.com/watch?v=cpaWCedoptA I like the special high reluctance transformer and...

What do you folks think about this gem: https://www.youtube.com/watch?v=cpaWCedoptA I like the special high reluctance transformer and kindling used as insulation.