https://imgur.com/a/b8l5qKQ Look at the circuit diagram. The positive of the battery is only connected through a capacitor. How can a...

https://imgur.com/a/b8l5qKQ Look at the circuit diagram. The positive of the battery is only connected through a capacitor. How can a capacitor possibly pass DC current to allow the battery to charge?

I bought a 6V, 6Ah battery from Home Depot to power my 3-year-old's toy electric car (the kind that a kid can ride). The previous...

I bought a 6V, 6Ah battery from Home Depot to power my 3-year-old's toy electric car (the kind that a kid can ride). The previous battery didn't hold a charge when I bought the car. One reference from batteryuniversity.com mentioned something about 2.50V per cell for SLA batteries. I'm assuming my battery has 3 cells. Another website mentions use of an L200 voltage regulating chip (http...

I have a 75332P MOSFET on a cordless drill controller heatsink. I guess it's part of a pulse width modulator. The drain (flange) connects...

I have a 75332P MOSFET on a cordless drill controller heatsink. I guess it's part of a pulse width modulator. The drain (flange) connects directly to one of the battery terminals. Does the MOSFET drain go directly to the battery minus/ground terminal? Or does it go to the battery plus terminal? Thanks. -- My application... I'm desperately trying to develop a better inline ...

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.

My neighbor has a solar powered outdoor decoration light that cycles through several colors but only runs for maybe an hour at night. It has a...

My neighbor has a solar powered outdoor decoration light that cycles through several colors but only runs for maybe an hour at night. It has a single 1200 mAh 1.2 volt rechargeable battery and a couple small solar cells to charge the battery. I measured the load current at 15 milliamps and the charge current at only 1.3 milliamps so it appears the solar array is not charging the battery ...

I was looking at the schematics of the first transistor radio, the Regency TR-1, and noticed that it uses a 22.5v....

I was looking at the schematics of the first transistor radio, the Regency TR-1, and noticed that it uses a 22.5v. battery. http://people.msoe.edu/~reyer/regency/schematic.jpg Later models use a more normal battery such as 9v. -Ramon

I want to replace this 3.7 Volt Lithium Ion battery. The dimensions are 1 14/16 x 8/16 inch. Can some help me find a...

I want to replace this 3.7 Volt Lithium Ion battery. The dimensions are 1 14/16 x 8/16 inch. Can some help me find a replacement? Thanks, Andy https://imgur.com/a/w5v2dHI

1. If I shorted the +5V and +12V in the molex connector, would I get +17V? What's the max. current? 2. Could I use 17V to charge a...

1. If I shorted the +5V and +12V in the molex connector, would I get +17V? What's the max. current? 2. Could I use 17V to charge a notebook battery rated 16V and 3.8A? Would it hurt the battery? -- @~@ Remain silent. Nothing from soldiers and magicians is real! / v \ Simplicity is Beauty! May the Force and farces be with you! /( _ )\ (Fedora 18 i686) Linux 3.9.6-200....

I have a 9V 180 ma discharged Nimh battery that I am charging at 25ma. How long will it take to charge? Thanks, Andy

I have a 9V 180 ma discharged Nimh battery that I am charging at 25ma. How long will it take to charge? Thanks, Andy

I need to generate sparks between two pieces of brass, about a half inch apart or slightly more. I want each spark to be triggered by a logic...

I need to generate sparks between two pieces of brass, about a half inch apart or slightly more. I want each spark to be triggered by a logic line going high (going low would work, too.) The voltage supply is 6v or 12v from a battery. The problem is that I need the circuit to fit inside a 1.5" inside diameter PVC pipe, and not take up more than, say, 3" of the pipe length, discounting battery...

Working on a gadget that uses a 12 volt motor (10 amp peak) and misc electr= onics running on lower voltages. It is powered from an external PSU...

Working on a gadget that uses a 12 volt motor (10 amp peak) and misc electr= onics running on lower voltages. It is powered from an external PSU like a= laptop supply, but 12 volts. There is also a sealed lead acid battery for= backup when the power fails. =20 This design uses pairs of pFETs to route the power from the 12 volts input = when present, or the battery when the line is not p...

Daimler and others already pointed out that the battery upon which Tesla's e-Semi is based does not exist. Tesla isn't just hoping a better...

Daimler and others already pointed out that the battery upon which Tesla's e-Semi is based does not exist. Tesla isn't just hoping a better battery will appear, however. They have good information on it and it isn't all that insider: http://www.businessinsider.com/new-discovery-could-be-death-blow-to-traditional-lithium-ion-batt eries-2017-12 https://www.theguardian.com/environment/2017/dec

I want to calculate approx run time of a D cell with a capacity of 13,000 Mah. I assume that Time(H) = Capacity(Ah)/Current(A) equals a final...

I want to calculate approx run time of a D cell with a capacity of 13,000 Mah. I assume that Time(H) = Capacity(Ah)/Current(A) equals a final battery voltage of 0 volts which will not work in my case. I need a calculation for an ending voltage of around 2.0 volts. (At 2.0 volts, my clock starts losing time.) Thanks

I have a solar charging I am using with my car battery. The current voltage of the battery is 12.7 volts. And the charger is still...

I have a solar charging I am using with my car battery. The current voltage of the battery is 12.7 volts. And the charger is still charging. Here are some specs for the charger. Rated power output = 5W Operating power voltage = 18V Operating power current = .33A Trickle charging current = .2A Floating charging Voltage = 13.8 Overcharge Protection Voltage = 14.1 Voltage At what ...

Hi All, I want to test out an in-line aerial amp and have supplied it with 12V battery and circuit for testing as below glummed from the web...

Hi All, I want to test out an in-line aerial amp and have supplied it with 12V battery and circuit for testing as below glummed from the web and spares. I can build things but am no shakes on real theory. It works well but seems a bit noisy (hiss on stereo) but I have it down at the RX end of the co-ax at the moment prior to going up the roof with it, so that might make quite a difference t...

I'm curious about what happens to an LED when it is exposed to a moderate overcurrent situation. This question came about as I was...

I'm curious about what happens to an LED when it is exposed to a moderate overcurrent situation. This question came about as I was troubleshooting some small white LED lights I built using 3 5mm LEDs and a current limiting resistor to run on 12Vdc (supplied by a lead-acid battery charged by solar). After some time, many of these strings would start to flicker or blink. I was about to po...

Hi all, I am trying to implement a very simple solar charged night garden light. Schematics is here:...

Hi all, I am trying to implement a very simple solar charged night garden light. Schematics is here: https://www.jameco.com/Jameco/workshop/JamecoFavorites/solarled.html Basically a solar panel charges a battery. When the solar panel output is low (at night), a joule thief circuit lights a led. The joule thief part works just fine, the problem is that the dark detector (2n3906 + 4.7K resis...