White 5mm Water Clear LED - 15deg - 5000mCd

Stock code: 3524
filler

Pricing:Ex VATInc VAT
1+
£0.30
£0.36
10+ £0.25 £0.30
100+ £0.20 £0.24
500+ £0.16 £0.19
Stock:
In stock

Description

No of parallel LEDs:
LED forward voltage: V
Typical LED current: mA
Battery voltage: V
Resistance (calc): Ohms
Preferred value: Ohms
Resistor colour bands:
Enter the operating voltage, click calculate resistor and the resistor value to work with the LED described on this page will be shown.

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Further Information

Please note: Instructions for using this product (if available) can be found in the product description.
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Q:
How many of these will run off a 9v battery and will they need a resistor?
Asked by: Rebecca
A:
The forward voltage on the LED is 3.5V, this means that when the LED is lit there will be around 3.5V across it. If you put two in series then across the pair the voltage drop will be 7V. With 3 it would be 10.5V. So to answer the first part of the question you can drive two LEDs from a 9V battery. To answer the second part, as the battery is at 9V and the LEDs have 7V across then the resistor must have 2V across it. Depending on how bright you want the LEDs to be will depend on the resistor value. Lets suppose we go for 20mA flowing through the LEDs, then there will also be 20mA flowing through the resistor. So using Ohms law, if V=2V and I=0.02A then R=100 ohms.
Answered by: Geoff Hampson
05-Sep-11

Q:
Can these be powered by a USB source? (5volt?)
Asked by: Mike
A:
Yes you can drive this LED from 5V however you MUST USE A CURRENT LIMIT RESISTOR. On the white USB lamp kit we use a 150 ohm resistor, which is plenty bright enough, you can go down to a 100 ohm which will give you about 20mA. If you are unsure about which resistor to use we have a nice tool in the resources section. The USB port can supply 100mA without negotiation so could run up to 5 white LEDs.
Answered by: Geoff Hampson
05-Apr-11

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