Light up my searchlight super bright LED5306 power bank 3730 constant current chip

The current of a single LED lamp bead is 60mA. If there are 4 in parallel and 7 in series, the total current is 240mA. The current output capability of a single 3730 is I=0.25/R. A single 3730 needs to reach a current output capability of 80mA, so the total resistance must be controlled at 3.125 ohms. Only when it reaches the brightest level can it be burned out. Try not to overdo it

At present, the proofing test has been completed and the physical welding test has shown good results. However, a suitable adjustable resistor has not been found. If there is a single-turn adjustable resistor within 100 ohms, please leave a link. It needs to be easy to twist, not the kind that requires a screwdriver. This The only drawback is that adjusting the brightness is not convenient enough and the dimming is relatively slow.

In order to improve usability, a power bank function has been added. A better battery can reach almost 7500mah. Four LEDs display the power.

The other side is the USB power bank output function and brightness adjustment adjustable resistor. Remember to use a sample as a cover. There are 8 powerful magnetic beads attached to the top. However, according to actual tests, it can be hung vertically but the side magnetism is still not enough and it will fall down. Improvement If you suggest, just change the magnet to a bigger one.

Actual measurement picture - to be uploaded (it is still super bright in a small area, but the effect is average in a large area. It should be the problem of the adjustable resistor. In the end, it is not a short circuit but about 10 ohms, causing the overall brightness to not increase)