Recent content by Microa

fenix-store
  1. M

    Help me salvage a Litra Torch

    Did you examine the flexiable PCB was secured with the connecter?
  2. M

    best LED for DIY fixed lighting?

    The Cree XPG3 would be the best LED for the Job ( low price, high light output at 1 watt power ).
  3. M

    create a 2S6P battery with 18650

    The schematic looks like which the positive terminal of the upper row 6P is short circuit to the negative terminal of the lower row.
  4. M

    Tech help - identifying a charging chip?

    Yes, the link is for TP4057. The resister R2 is employed to set the charging current. Adjust the charging current according to the specifications of the battery.
  5. M

    Tech help - identifying a charging chip?

    The pins layout is the same as TP4057 which is a 500mA max. charger IC.
  6. M

    Heat sink for 3w leds copper soldered

    If you talking about the power consumption and assume the Vf of the LED is 3V driven at 500mA ( not including the power loss of the driver ), you are right. If you talking about the light output, a 40W standard bulb has about 400 - 550 Lm output, you need only about 6W for LED. Nowadays, the...
  7. M

    Please help me repair the swich on budget CREE light

    It looks like a 6x6 surface mount tactile switch which has variant of different push rod height. Measure the sizes of your switch and the push rod height before you place the order.
  8. M

    Heat sink for 3w leds copper soldered

    I think the LED would survive. It depends on the ambient temperature and application. I have a similar built which is very uncomfortable hot to hold by hand. The thermal path of my light is LED --> Al block --> Copper tube and End cap. If you solder the LED directly to the bottom of the end cap...
  9. M

    Mean Well LDD-1500LW driver and 4 Cree XMl's .... Wiring in series or parallel?

    A full charged li-ion cell is 4.2V and which should be cut off at 2.5 - 2.8V. So 5S li-ion cells should be adequate. 2.8V x 5 = 14V and 4.2V x 5 = 21V both values are higher than 14V mean that the LEDs are all in current regulated during the whole battery discharging period. 4S 2100mA each LED...
  10. M

    Mean Well LDD-1500LW driver and 4 Cree XMl's .... Wiring in series or parallel?

    I think you have three options. 1) 4S 1500mA each LED 306.9lm 3.14V 4.71W. Total 4 LEDs 1,227.6lm 12.56V 18.84W. 2) 2S2P 750mA each LED 166lm 2.92V 2.19W. Total 4 LEDs 664lm 5.84V 8.76W. 3) 4P 375mA each LED 85lm 2.77V 1.03W. Total 4 LEDs 340lm 2.77V 4.12W. If you want the brightest output...
  11. M

    How can I estimate the thermal resistance of the thermal grease layer?

    Thanks for your advice. I have omitted the "16" fudge factor:thinking:
  12. M

    How can I estimate the thermal resistance of the thermal grease layer?

    Thanks for your valuable information. I estimated the thermal resistance this way. If I am wrong, please correct me. Suppose the LED is an XML, the thermal pad area = 0.0028 x 0.0048 m = 0.00001344 sq. m. R = t / K * A = 0.0004 m ( thermal grease thickness ) / 6 ( thermal grease's heat...
  13. M

    How can I estimate the thermal resistance of the thermal grease layer?

    Hi CPF guys, I am going to mount a 20mm star MCPCB to a 37x37x23mm heatsink. The thermal grease's heat conductivity is 6.0 W/m*K. Suppose I can apply the layer as thin as 0.4mm thick, can I estimate the thermal resistance of the layer?
  14. M

    Max1757/8 Li-ion Battery Charger DIY

    Dear mohsin qau and ruben vleuten, Sorry for my late reply. Please find enclosed EAGLE files in the dropbox https://www.dropbox.com/s/iuirss44epjf24i/MAX1757_2-3_Cell_23x40.brd?dl=0 https://www.dropbox.com/s/vv2mjmo4zpiouwp/MAX1757_2-3_Cell_23x40.sch?dl=0...
  15. M

    About LED driver boards

    Here enclosed the data sheet of TP4056 in chinese. https://www.dropbox.com/s/vrq19sjdn95x8fr/TP4056.pdf?dl=0
See more

Latest posts

Top