Category: led lamp
Automatic White-LED Garden Light
| May 9, 2011 | Posted by admin under led display, led lamp |
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This white-LED driver circuit is ideal for use in a garden light. It automatically turns the LED on at night and runs from a single 1.2V nicad cell which is recharged by a solar cell during the day. The prototype used the existing casing and solar cell from an old garden light but you could…
Driver For 20 LEDs
| May 9, 2011 | Posted by admin under led lamp |
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If we wish to use a step-up switching regulator to run several LEDs from, for example, a 3 V battery, we find that the maximum usable mark-space ratio limits us to driving just a few LEDs in series. If we have seven white LEDs in series the total forward voltage will be about 7 times…
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