All Questions
8
questions
0
votes
1
answer
95
views
What is the "best" way to make a diy 7v rechargeable battery?
I have a device (the wii "sensor" bar, basically an IR LED array) that the literature says takes 7v. I can't find any battery offerings that come in 7v, but many that are 3.7v, so I am stuck ...
- 141
0
votes
2
answers
415
views
Boost converter single cell AA battery not delivering enough voltage when connected to Wemos D1 mini
I must power a Wemos D1 mini at 5V (more on that below) (along with 4 LEDs and a DC motor) with a single cell AA battery. I have tried 2 boost converters (Vin 0.9V-5V) and none worked.
I need 5V for 2 ...
- 263
-1
votes
1
answer
216
views
Help understanding a circuit (li-ion charger with 5v step-up) [closed]
In the circuit below, as well as in the typical application schematic for the tp4056, bat+ connects directly to bat- with a 10uF capacitor in between.
Why doesn't this connection end up shorting the ...
- 103
1
vote
2
answers
257
views
3.7V to 7.5V step up circuit
I need a circuit which can step up the voltage from my 3.7V Li Ion battery to 7.5V.
The current requirements are pretty small (up to 50mA max), but I have a latching solenoid which requires a short 7....
- 37
2
votes
1
answer
98
views
Generating +65 V (positive) and -65 V (negative) voltages from two 12 V batteries using cheap step-up converters?
I need to power a 300 W class D amplifier with positive and negative 65 V.
As I'm a do-it-yourself guy, I didn't know about positive and negative voltage and ordered a bunch of these normal step-up ...
- 21
0
votes
0
answers
654
views
Use multiple batteries in series vs Using a boost converter
I have encountered a circuit that totally confuses me:
I have a simple LED flash light that came with my electric bicycle. The flash light is designed to work with a range of 24V-36V so it can be ...
- 293
1
vote
2
answers
2k
views
Using a 36V battery with step up converter for 48v kit
I have an e-bike motor ( bbs02 48v 750watts ) which requires a 48v battery. I also have a 36v 13ah e-bike battery. Opening the battery and changing cells connection to make it 48 takes a lot of effort....
- 171
0
votes
1
answer
604
views
5V Step Up Converter Drops Voltage to 2.3 Volts when Connected to Device
Recently I combined two 18650 batteries in Parallel, and attached the output of the Paralleled 18650 batteries to a 5V Step UP Converter.
Device draws 5V 4a.
Here is a picture to the step up:
...
- 412