6v බැටරියකින් LED දල්වන්නේ කොහොමද?

[Mr.Tom]

මම දන්න විදි‍යට නම් මචන් 7805 regulator එකෙන් කරන්නේ 5V stable output එකක් දෙන එක......(ඒකට 25V විතර දෙන්න පුලුවන්.....හැබැ‍යි අනිවා heat sink එකක් හ‍යිකරන්න වෙ‍යි සැහෙන්න රත්වෙන හින්දා.....)
සාමාන්‍ය‍යෙන් 3.3V වගේ LED එකක් හ‍යි කරනකොට 330R වගේ resistor එකක් series connect කරලා තම‍යි power දෙන්නේ....

අනේ මන්ද මචං ඕනෙ දෙයක් වෙන්න කියලා හෙට 7805 රෙගියුලේටරයක් අරන් හදලා බලනවා

 

[aruna1]

අනේ මන්ද මචං ඕනෙ දෙයක් වෙන්න කියලා හෙට 7805 රෙගියුලේටරයක් අරන් හදලා බලනවා

no no,
7805 will not work with 6V input. it requires atleast 7V input to work properly. If you really need a 5V output use an LDO like LM1085-5

 

[Mr.Tom]

no no,
7805 will not work with 6V input. it requires atleast 7V input to work properly. If you really need a 5V output use an LDO like LM1085-5

හොදයි සහෝ. ඔය සර්කිට් එකේ විදියට හැදුවම හරි යනවා ඇති නේද?

 

[Mr.Tom]

no no,
7805 will not work with 6V input. it requires atleast 7V input to work properly. If you really need a 5V output use an LDO like LM1085-5

හැබැයි සහෝ මට ගන්න ඕනේ 5V output එකක් නෙවෙයි 3V output එකක්

 

[cybernalin]

I'm an Electronics Engineer, so I know my stuff.
in your case,
P=V*I
P=(12-3)*(20*40)
P=9V*0.8A
P=7.2W

anyway good luck

Respect you bro... i got this from this user...

But it works perfectly

 

[aruna1]

හැබැයි සහෝ මට ගන්න ඕනේ 5V output එකක් නෙවෙයි 3V output එකක්

look for LD1117-33 , 1A version. it is a fairly common LDO

 

[Mr.Tom]

look for LD1117-33 , 1A version. it is a fairly common LDO

හොදයි සහෝ උදව් කලාට බොහෝම ස්තූතී

 

[aruna1]

buy one of these
http://www.ebay.com/itm/DC-DC-Buck-...t=LH_DefaultDomain_0&var=&hash=item33899195ea

then let me know, I'll tell you how to make the constant current part.

(above circuit can be made from parts available in local market,but if you dont know electronics, I suggest purchasing above module, and it is much cheaper to buy the ready made module)

 

[cybernalin]

buy one of these
http://www.ebay.com/itm/DC-DC-Buck-...t=LH_DefaultDomain_0&var=&hash=item33899195ea

then let me know, I'll tell you how to make the constant current part.

(above circuit can be made from parts available in local market,but if you dont know electronics, I suggest purchasing above module, and it is much cheaper to buy the ready made module)

machan me circuit eken 10W LED ekak use karanna puluwanda

 

[Mr.Tom]

buy one of these
http://www.ebay.com/itm/DC-DC-Buck-...t=LH_DefaultDomain_0&var=&hash=item33899195ea

then let me know, I'll tell you how to make the constant current part.

(above circuit can be made from parts available in local market,but if you dont know electronics, I suggest purchasing above module, and it is much cheaper to buy the ready made module)

 

[aruna1]

machan me circuit eken 10W LED ekak use karanna puluwanda

mmm yeah, sort of.

if LED Vfb is 3V then it requires 3.333333A to operate it fully. this circuit can give only 3A (IC can give 3A, but I'm not sure whther the inductor in the circuit can handle 3+ A current, chinese stuff ne).
oyin 2k parallel karala puluwan (through current limiting resistors)

 

[cybernalin]

mmm yeah, sort of.

if LED Vfb is 3V then it requires 3.333333A to operate it fully. this circuit can give only 3A (IC can give 3A, but I'm not sure whther the inductor in the circuit can handle 3+ A current, chinese stuff ne).
oyin 2k parallel karala puluwan (through current limiting resistors)

900MA thamai LED eka aulak nethi wei neda machan Thanks for link....

 

[Sonique]

Calculate karala daapan eka ekaa dena ewwa danna epa. Bulb wala life time eka adu wenawa max wattage eka pannoth. Use karana LED wala wattage eka balala 2.7-3V ena widihata wage current eka diyan

P=VI

6V batteryak nun thiyenne LED dekak eka branch ekata ena widihata branches parallel daanna. Hariyata danna ekekta kiyala design karaganin bun thawa ekekge ekak copy karanna giyaama kela wenawa LED wala life time ekatai brightness walatai

Eta passe branches gaana balala daana bulb gaana anuwa
V=IR daala resistor eka mokadda kiyala balahan. LED wala thiyanawa resistance eka constant slope kiyala aran hadaganin naththan hadala iwarayak na

 

[Silly point]

bumpz...

 

[dinchad]

b
u
m
p