richardworrall
Premium Member
Registered: 20th Sep 05
Location: Derby
User status: Offline
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Help, completely forgot everything learned at school about simple LED circuits.
I need to know what components and resistances etc to make a 9v two green led circuit work with a switch and the battery connector and the correct way round for resistors etc.
Can anyone help? 
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richardworrall
Premium Member
Registered: 20th Sep 05
Location: Derby
User status: Offline
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anyone?
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Bart
Member
Registered: 19th Aug 02
Location: Midsomer Norton, Bristol Avon
User status: Offline
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What's this for?
What's 9V your LEDs or circuit voltage?
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richardworrall
Premium Member
Registered: 20th Sep 05
Location: Derby
User status: Offline
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Doesn't have to be nine volts. Just need to put together a simple quick circuit to light up 2 green LEDs for a couple of mins.
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John
Member
Registered: 30th Jun 03
User status: Offline
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Just connect one to a couple off AA batteries then.
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Dan
Premium Member
Registered: 22nd Apr 02
Location: Gorleston on Sea, Norfolk
User status: Offline
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Depends what u buy, a lot of leds now come so that you can connect them straight to battery power.
Seem to remember back at school is was a 330ohm resistor for the leds then, but probably wrong
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ed
Member
Registered: 10th Sep 03
User status: Offline
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You need to calculate the size of the resistor based on the colour of the LED, the number of LEDs you're running and the input voltage. There are lots of calculators online: http://ledcalc.com (for example).
The voltage drops after each LED so you will probably find that you're limited to about 2 or 3 LEDs inline.
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Kyle T
Premium Member
Registered: 11th Sep 04
Location: Selby, North Yorkshire
User status: Offline
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I used this when doing the LED's in my car:
http://led.linear1.org/1led.wiz
Lotus Elise 111R
Impreza WRX STi
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