LED Dimmer

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STD LED Dimmer

License: Public Domain

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Update time： 2022-03-01 18:51:12

Creation time： 2018-04-03 10:28:58

Description

**555 timer based PWM LED dimmer** This project uses PWM to turn on and off a LED (or a strip of them) really fast and changes the duty cycle (Fig.1) so that the human brain perceive it as the dimming of the LED(s). This means that the MOSFET doesn’t have to drop large amount of voltage, this makes the device very energy efficient. **Fig.1** ![pwm1.gif](//image.easyeda.com/pullimage/0iJsTEAk49wUjvyXQzvTHPv1PzZTLuy3SAzGAvNu.gif) TODO: Calculate efficiency at different load currents and put a graph here.

Design Drawing

schematic diagram

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V1
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PCB

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V1_PCB
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V2_SMD
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BOM

BOM download Purchase Parts

ID	Name	Designator	Footprint	Quantity	Manufacturer Part	Mounted
1	LEDOUT	LEDOUT	CONNECTOR 5.0MM	1	2.54-1*2PFemale	Yes	C49661
2	NE555DR	U2	SOIC-8_150MIL	1	NE555DR	Yes	C7593
3	VIN	VIN	CONNECTOR 5.0MM	1	2.54-1*2PFemale	Yes	C49661
4	100R	R3	0603	1	RS-03K1000FT	Yes	C115420
5	NCE3018AS	Q1	SOP-8_150MIL	1	NCE3018AS	Yes	C163739
6	1uF	C1	0603	1	0603X105K160NT	Yes	C89188
7	1k	R4	0603	1	WR06X1001FTL	Yes	C112433
8	M4	D2,D1	SMAF	2	M4	Yes	C164158
9	50K	R2	RES-ADJ_EVM3X3	1	EVM3ESX50B54	Yes	C11962