Search Results for: led circuits diagrams
LED flasher circuit can be built based on 555 IC. Using 555 IC, the flashing rate can be more flexible to adjust. This LED flasher circuit is similar to our transistor flasher circuit, but the flashing period of both LEDs won’t be same. The flashing frequency is determined by C1, R1, and R2. …
Read MoreLight Emitting Diode or LED is suitable for ON/OFF indicator since it has high durability, almost free of maintenance. The most common usage is in low voltage application since the operating voltage is low DC. Taking the benefit of its high durability of LED in high AC voltage from line voltage can be done using …
Read MoreThis simple LED flasher circuit will turn ON and OFF two LED alternatively. The first LED will turn ON when the second LED is OFF for some period, then the first led will turn OFF and the second LED will turn OFF. This cycle will be repeated as long as the battery is connected to …
Read MoreThis is a high-brightness LED-driver circuit. To provide a constant-voltage output we usually use DC/DC regulators. But constant-current output is the one that is needed in LED application. To provide a constant-current output, we can use this circuit. Here is the schematic diagram of high-brightness LED-driver circuit : This circuit uses …
Read MoreBelow is the simplest circuit you can get. We can use any NPN. Connect the 220 ohm resistor, LED and transistor as shown in the figure below. Touch the top point with two fingers of one hand and the lower point with fingers of the other hand nad squeeze. When you squeeze harder, …
Read MoreThis is flashing LED circuit emulate the turning of incandescent lamp. The characteristic of incandescent lamp is that they can’t abruptly change the luminosity. This circuit is used to fade in and fade out the on and off state change. Here is the schematic diagram of the circuit: The time constant of …
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