I have this portable rechargeable battery pack for charging smartphones. It is 5V, 2.4A, and 5000mAh. I would like to use it to power a wireless mouse that normally requires 2 AAA batteries, which is 3V and I'm not sure what is the A and mAh. I made a voltage divider that involves a 220Ω...
Hello,
First off, I'm a newbie. Not sure if what I'm looking for is doable, possible...
I have 8 battery powered light fixtures.
They come with 24v, 5a individual chargers.
I would like to make a charger where I can charge all my (8) lights fixtures at once without the need of plugging 8...
First the picture, because a picture is worth a thousand words.
Is this possible?
If the light is OFF, then the motor stops.
Low light brigthness = low motor speed.
High light brigthness = high motor speed.
Thanks.
Hello all,
I am intending to make a wearable device that have a GYRO, ACC sensors, monochrome display, BLE connection. the wearable will be powered with a rechargeable 50mAh (both wired and wireless charging).
I have checked multiple solutions from different semiconductor manufacturers but i...
I using the MOSFET IRFB3004PBF switching. 56.2V is a source voltage coming from the charger and 48 is the nominal voltage of the batter.
switch S1 is for switching Vgs.
Vgs=5 v.
Rgs=10k ohms (connected to the gate terminal and battery ground).
battery is 13s3p Nominal=48v Peak=54.6v
Will MOSFET...
I have a 8 AA batteries (12V total) that is powering a light that draws .0517A.
The light no longer outputs enough light when the battery voltage drops to 8Vdc.
Typically I'd calculate battery life via:
2.5Ah * 8 = 20AH.
Then:
20AH/.0517A = 386 hours.
Does this equation change if I want to...
I like to make things and I had an ambitious idea to make a small scale Griswold house and needed to wire together 100 1.5V 100mA (AC and DC compatible) pre-wired bulbs that are typically used for hobby train use. I am a complete newbie to anything that has to do with lights and wiring, but my...
hi,
I ask for your help to:
determine, if possible, the type of transistor T5, T7 (SMD code: MK3C).
help me to understand the operating role of the set T5, T7 and R23, R33 in the circuit (it's like a logical port type AND, but I do not understand how it works).
help me understand why the...
I'm new to circuit design. I'm using an Injoinic IP5306 battery charging IC (datasheet). I also use an AMS1117-3.3 (datasheet) to drop down the 5V power it produces to 3.3V. I've attached a picture of my schematic which shows the relevant portions, the IP5306 in single-LED configuration, the...
Hi,
I have to switch a high current(DC 12V@~60A approx.) for a battery-supplied circuit.
But its on-status resistance should be as low as possible. Because you know the Ohm's Law, the I is going to increase up to even 100 amps sometimes, so a very small resistance creates a big difference.
I...
Hello,
I want to design a battery simulator circuit to test my board. My board connects to a single cell li-on battery, 3.8V 2400mAH and it has a wireless charger circuit with up to 400mAH charge.
The battery simulator needs to provide up to 1A to the board and to be "charged" at 400mA.
I've...
hi
for a diving light, i need to create a 4s3p battery pack (lithium). I can have max 2 level of battery in a delrin cylindrical.
What could be the easier wiring for welding?
I put all battery on the same side... but it's not mandatory...
thanks
I'm building a mobile robot which is quite heavy and needs some serious HP. For this and other reasons I want to mount 4 induction motors to each wheel (for a total output of about 8kW) and power them via batteries. However, those motors need 3-phase current and I obviously can't plug them...
I have a sensor node containing an MCU & radio running at 3.3 V and a sensor running at 5 V.
What is the better approach for powering up the system (in terms of efficiency, stability, etc.) :
1. High Voltage Battery + Buck Converter
or
2. Low Voltage Batttery +...
I'm posting today hoping for some guidance on a project i would like to attempt. I recently came into a lot of 64 12v 7AH Sealed Lead Acid batteries from a backup UPS. The batteries are still good and take a charge and load like normal for the most part. Since i only have the batteries and...
Hi everyone!
I am building a robot that carries a drill to make holes in the ground. I have not been able to find similar size/power references regarding how to power the motors. I would like to know how to protect the battery and motor drivers, my specific questions are:
- Where to place...
I have 2 18650 li-ion cells, each at 3.7v
(in case you don't see the pictures, they are available here : https://raspberrypi.stackexchange.com/posts/121847 )
and this bay with this white connector
I saw on youtube that depending on the length of the cell, we can know whether they have...
Hello all,
First of all I'm a complete newbie about circuits and electronics.
I recently bought a 3D printer and I saw this project on thingiverse.
Quick sum up : LEDs (WS2812) lamp controlled by an ESP8266.
The main issue is that the firmware of the ESP8266 provided to control the LEDs do...
For the past few days I have been trying to buy a proper battery impedance measurement device that is good and also falls under my budget of 1000 dollars. I will be mostly using it to test 3.7V Lithium ion batteries. Could anyone suggest a good measurement device for that