Asked by: Rebecca
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Description
White 5mm Ultra bright Water Clear LED with a viewing angle of 15 degrees. Luminous intensity 5000mCd.
| Forward voltage drop: | 3.2 V |
| Viewing angle: | 15 degrees |
| Max forward current: | 30 mA |
| Luminous intensity: | 5000 mCd (@20mA) |
| Lens types: | Water clear |
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- If you spend over £200 (£240.00 including VAT, excluding large materials or lithium batteries) delivery is free within the UK.
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Further Information
- For information about all of the delivery options we offer see full delivery details.
DescriptionOne you've mastered starting and finishing off stitches you're ready for this tutorial which describes how to create a basic E-Textiles circuit using a standard through hole LED. This circuit...
DescriptionOne you've mastered starting and finishing off stitches you're ready for this tutorial which describes how to create a basic E-Textiles circuit using a standard...
Q:
How many of these will run off a 9v battery and will they need a resistor?
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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