Worlds Smallest Power Supply !
Intro: Worlds Smallest Power Supply !
Have you ever wanted tiny sized power supply that still pack lots of power, here's world's smallest power supply you can make under 6$ !!! Following Features will impress you that's for sure so why not make one ?
# Features
1. 3-25v Adjustable Voltage Output
2. Built in 720mAh Battery Backup
3. 2 Amp Max Current
4. Built in Live LED Voltmeter
5. Built in Voltmeter For Quick Measurement
6. In Built 3.7v Battery Charger
STEP 1: Applications
1. Power Supply (OTG) on the go !
2. Measure voltage with it.
3. Do the Job of Many Power supplies 3v, 5v,9v,12v,19v,24v...
4. Charge 3.7v Batteries on the go.
STEP 2: You Will Need
★☆★ Buy Parts from your online local store ★☆★
1. 3.7v Li-po Battery http://geni.us/okAOH
2. TP4056 Lithium Battery Charger http://geni.us/f6uQJ
3. Micro Usb 2A 25v Step Up Converter http://geni.us/jbMwyB
4. LED Voltmeter http://geni.us/to6Ap9p
STEP 3: Watch Full Tutorial
Watch Full Tutorial Here
STEP 4: Making PCB's Compact
LED Voltmeter and Dc-Dc Converter has few leads which may puncture the battery and take up lot of extra space, so use dremel tool or sand paper to make these pcb's flat at the bottom so that battery can be effectively installed here
Or Yo can use flathead pcb wire cutter to do this job , just don't apply too much force otherwise pcb tracks will be damaged.
STEP 5: Make the Connections
Make The connections As Showed In This Block Diagram.
1. Connect the tp4056 board to the battery
2. Connect the negative terminal of the battery to the dc-dc converter
3. Connect switch between positive terminal of the battery and dc-dc converter
4. Connect LED Voltmeter at the output of dc-dc converter
STEP 6: Stick Togather !
Well Done Your Connections are finished !
Now Stick all the parts togather in a compact form factor as i've done in this picture.
If you like this instructibles ,then check out my Youtube Channel .
STEP 7: Some Extra Safety Tips
1. As you are dealing with li-po battery's , make sure not to puncture,smash,tear or casue any kind of damage to the battery it may cause fire hazard. Do it at your own risks.
2. Don't try to measure voltage grater than 24v with this power supply's voltmeter It can damage the dc-dc converter.
3. If you connect any inductive load ,there is chance of causing damage to dc-dc converter , so connect diode at the output. diode will drop 0.7v but save your power supply.
40 Comments
drherobrine01234 5 years ago
chiragjwl 6 years ago
GauravJ14 7 years ago
RexTexHM 7 years ago
If you use a 3 wire voltmeter, the output can go below 3V
bptjr 7 years ago
bptjr The tp4056 charge board comes stock to current limit at 1 amp . Is this too high current to charge the battery you describe ? Or did you change the current limit resistor on the board ? Great project I plan to build one Thanks
MirzhaK 7 years ago
can I use this power supply to charge my laptop?
Input : 100-240V ~ 1.8A
Output :19V - 3.42A
ovi20k 7 years ago
tonep 8 years ago
brianfit1 8 years ago
Love it. As an alternative to flat-sanding the board, you could press it into a slab of Sugru, and shape it around the Li-po for a nice finished look.
wstewl 8 years ago
1) does the battery get automatically disconnected from the circuit when the 'high power' USB input is used?
2) using just the battery, what output current is available from the circuit (at 5V, or at 12V)?
Kedar Nimbalkar 8 years ago
wstewl 8 years ago
When I build it I'll have to be careful about keeping the switch off when using external power.
jr2233 8 years ago
Is that small battery to be used for the charging circuit or is it for whatever I am turning on? Can I replace that small battery with a large 5,000 mAh battery? Will the 2 amp charger be enough to charge it> Hope someone answers me.JR
Kedar Nimbalkar 8 years ago
lmcwill 8 years ago
No. This will handle single cell lipo batteries. Charging a large lipo (multi-cell) battery requires a balancing charger to keep the charge rate under control.
ac-dc 8 years ago
He wrote nothing about using more than one cell, so "no" is premature and incorrect. There are ~ 5000mAh Li-Ion cells and you could use as large a cell as you want providing there is no minimum charge rate specified by the manufacturer.
Yes a 2A charger would, in most cases, be enough to charge a 5Ah battery, but the charger is not 2A, it is 1A max, but the input is USB so your source could be even lower at 500mA.
Even as low as 500mA could work but it would seem undesirable to have to wait that long so I would recommend that you find an alternate power source and charger capable of more than 1A, which will raise the build cost a little but so does the 5Ah battery.
shaheed 8 years ago
Kedar Nimbalkar 8 years ago
evdj 8 years ago
Kedar Nimbalkar 8 years ago