I don't use these to build chargers but to transform old flashlights that use big expensive 4.5 batteries to LED flashlights that can work with one or 2 normal AA batteries. I thought that I have to use a resistor between the output of the DC-DC unit and the LED, but the LED works well without such resistor. I recover the LED ships from dead LED bulbs. I noticed that when a bulb dies, it is often because that one or few LEDs died. The other LEDs on the bulb still OK. Not easy to unsolder and re-solder such small smd LEDs but you can do it with time I haven't tested all 5 modules but the 2 I used worked well. Notice that when the module is alimented by only one AA battery at the input, the red LED does not work and still off

I don't use these to build chargers but to transform old flashlights that use big expensive 4.5 batteries to LED flashlights that can work with one or 2 normal AA batteries. I thought that I have to use a resistor between the output of the DC-DC unit and the LED, but the LED works well without such resistor. I recover the LED ships from dead LED bulbs. I noticed that when a bulb dies, it is often because that one or few LEDs died. The other LEDs on the bulb still OK. Not easy to unsolder and re-solder such small smd LEDs but you can do it with time I haven't tested all 5 modules but the 2 I used worked well. Notice that when the module is alimented by only one AA battery at the input, the red LED does not work and still off

I don't use these to build chargers but to transform old flashlights that use big expensive 4.5 batteries to LED flashlights that can work with one or 2 normal AA batteries. I thought that I have to use a resistor between the output of the DC-DC unit and the LED, but the LED works well without such resistor. I recover the LED ships from dead LED bulbs. I noticed that when a bulb dies, it is often because that one or few LEDs died. The other LEDs on the bulb still OK. Not easy to unsolder and re-solder such small smd LEDs but you can do it with time I haven't tested all 5 modules but the 2 I used worked well. Notice that when the module is alimented by only one AA battery at the input, the red LED does not work and still off

ottimo oggetto per poter elevare la tensione da 1 volt fino a 5 volt totali

ottimo oggetto per poter elevare la tensione da 1 volt fino a 5 volt totali

ottimo oggetto per poter elevare la tensione da 1 volt fino a 5 volt totali

I test it with a 18650 3.7v battery for a cellphone usb charger and it works!

I test it with a 18650 3.7v battery for a cellphone usb charger and it works!

I test it with a 18650 3.7v battery for a cellphone usb charger and it works!

Güzel parçalar. Sağlam teslim alınmıştır. Tavsiye edilir.

Güzel parçalar. Sağlam teslim alınmıştır. Tavsiye edilir.

Güzel parçalar. Sağlam teslim alınmıştır. Tavsiye edilir.

it great module for step up 3.3v to 5v from CC3D to use telemetry.

it great module for step up 3.3v to 5v from CC3D to use telemetry.

it great module for step up 3.3v to 5v from CC3D to use telemetry.

Cheap as can be, works like a charm. I used it on a Li-Ion i ripped out of a GPS and rigged it to this and one of the Li-Ion charging boards. no issues ive seen yet.

Cheap as can be, works like a charm. I used it on a Li-Ion i ripped out of a GPS and rigged it to this and one of the Li-Ion charging boards. no issues ive seen yet.

Cheap as can be, works like a charm. I used it on a Li-Ion i ripped out of a GPS and rigged it to this and one of the Li-Ion charging boards. no issues ive seen yet.

Good product.

Good product.

Good product.

Perfect woks well

Perfect woks well

Perfect woks well

ok

ok

ok

Good product and work as promised

Good product and work as promised

Good product and work as promised