Diy Christmas lights: Difference between revisions
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(Created page with "== Introduction == Make a simple battery powered Christmas light with seven (7) leds. == Theory == === LEDs and wiring === === Photodiode and transistors === == result ==") |
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== Theory == | == Theory == | ||
Use leds in series, as parallel leds might light on uneven brightness. | |||
=== LEDs and wiring === | === LEDs and wiring === | ||
* Red and yellow led: 2 V | |||
* Green and blue led: 2.9 V | |||
* White: 3.3 V | |||
Seven blue leds makes <math>2.9\times7=20.3 V</math>, and white blue leds drops the voltage by <math>3.3\times7=23.1 V</math>. | |||
If we use simple AA batteries, we will need <math>14\times 1.5= 21 V</math> or <math>16\times1.5 = 24 V</math>. Quite many. . . | |||
=== Photodiode and transistors === | === Photodiode and transistors === | ||
== result == | == result == | ||
Revision as of 20:44, 13 November 2022
Introduction
Make a simple battery powered Christmas light with seven (7) leds.
Theory
Use leds in series, as parallel leds might light on uneven brightness.
LEDs and wiring
- Red and yellow led: 2 V
- Green and blue led: 2.9 V
- White: 3.3 V
Seven blue leds makes , and white blue leds drops the voltage by .
If we use simple AA batteries, we will need or . Quite many. . .
