Monthly Archives: May 2010
Temperature controlled LEDs by LM358
| May 26, 2010 | Posted by admin under led display, led lamp |
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The circuit is nothing but two LEDs (D1 and D2), whose status are controlled by the temperature of the surroundings. The famous IC LM35 is used as the temperature sensor here. Output of LM35 increases by 10mV per degree rise in temperature. Output of LM35 is connected to the non inverting input of the opamp…
Delayed ON LED
| May 25, 2010 | Posted by admin under led display, led light |
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Here is very simple circuit in which the LED becomes ON only after a preset time the power supply is switched ON. When the power supply is switched on the transistor will be OFF. The capacitor now charges via the preset R3 and when the voltage across C1 is sufficient, the transistor switches ON and…
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