Some time ago, I bought an electric bell for the baby to play, and after using it for a while, I found that this thing consumes a huge amount of electricity, and the two No. 5 batteries can't last for two days! Change it accordingly!!!!
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Coincidentally, when I was idle and shopping for a treasure, I actually gave a 3 yuan red envelope, and then I needed to specify the goods, and more coincidentally, there was a pressure relief module! Hi ~ Buy it!
It's a white prostitute
Wait, wait, it's here! Change it immediately!
Turn over the box and find an old data line, as long as the positive and negative lines are on the line, distinguish between positive and negative poles, weld it! The output end uses a network cable, because it is "hard" enough not easy to fall off!
Then use a multimeter to adjust the voltage, as shown in the following figure
Use a word change cone to twist the copper-colored screw on the blue adjustable resistor and adjust it to fit the voltage!
5v input, 3v output
Then take the test on the machine
The voltage after the load is about 2.98v, as shown in the following figure
Measure the current, as shown in the figure below, the pointer is on 20A, and the electric tiger is alive and free
Then install the unit
The line at the output end is squeezed on the contact, so use a hard wire
All USB adapters can be powered directly, saving you money on batteries
In fact, there is another way to change, that is, the AMS1117 chip can output a fixed 3.3v, which requires the front and rear ends to add capacitors, but for long-term use, it is still convenient to use the module