LED light strip dimmer circuits

Schematics

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RGB (3-channel) schematic

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RGB (3-channel) board layout

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Suggested parts

Resistors:

10×	1k 2W (R1-R10)
11×	1k 600mW (all others)
2×	10k 600mW
1×	100k 600mW
5×	100k linear potentiometer with LED Bournes PTL45-15O0-104B1

Capacitors:

1×	470pF (C1)
1×	3.3nF (C2)
1×	10nF (C3)
1×	47nF (C4)

Transistors:

7×	KSD5041RTA NPN BJT 20V 5A
10×	2N3906BU PNP BJT 40V 200mA
2×	SS8050CBU NPN BJT 40V 1.5A

Diodes:

8×	1N4148-T general purpose

LEDs (diffused):

1×	red (e.g. TLUR6400 15mcd 10mA)
1×	green (e.g. TLHG5405 15mcd 10mA)
1×	blue (e.g. TLHB5400 15mcd 10mA)
1×	amber (e.g. SSL-LX5093AD 30mcd 30mA)

ICs:

4×	LM555 timer
1×	LM2903 dual analog comparator
5×	8-pin socket (optional)

Power supply:

1×	LD1117V50-DG 5V 800mA LDO (non-LDO equivalent is OK)

Connectors:

9×	right-angle pin header
1×	2.1mm plug
1×	2.1mm right-angle jack (e.g. Adafruit 393)

Sensors:

1×	Phototransistor (e.g. OED-PCC-9PS-1L)
1×	PIR motion sensor (e.g. Adafruit 189) (see separate schematic below)

Circuit boards:

1×	Radioshack 276-168B
1×	Radioshack 276-158B

Case:

1×	Large hinged box Container Store 10054860

Mounting hardware (all nylon):

4×	⅝" 6/32 bolt (binding head)
4×	⅜" 6/32 bolt (binding head)
8×	6/32 hex nuts
4×	⅛", 0.14" ID standoff
4×	¼", 0.14" ID standoff

Wire:

22AWG stranded recommended for connecting the boards

All parts available from Mouser except where noted.

Monochrome (1-channel) schematic

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Monochrome (1-channel) board layout

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Suggested parts

Resistors:

4×	1k 2W (R10-R13)
5×	1k 600mW (all others)
1×	2.2k 600mW
2×	10k 600mW
1×	100k 600mW
2×	100k linear potentiometer with LED Bournes PTL45-15O0-104B1

Capacitor:

1×	3.3nF (C2)

Transistors:

4×	KSD5041RTA NPN BJT 20V 5A
4×	2N3906BU PNP BJT 40V 200mA
2×	SS8050CBU NPN BJT 40V 1.5A

Diodes:

2×	1N4148-T general purpose

LED (diffused):

1×	amber (e.g. SSL-LX5093AD 30mcd 30mA)

ICs:

1×	LM555 timer
1×	LM2903 dual analog comparator
2×	8-pin socket (optional)

Power supply:

1×	LD1117V50-DG 5V 800mA LDO (non-LDO equivalent is OK)

Connectors:

7×	right-angle pin header
1×	2.1mm plug
1×	2.1mm right-angle jack (e.g. Adafruit 393)

Sensors:

1×	Phototransistor (e.g. OED-PCC-9PS-1L)
1×	PIR motion sensor (e.g. Adafruit 189) (see separate schematic below)

Circuit board:

1×	Radioshack 276-168B

Case:

1×	Large hinged box Container Store 10054860

Mounting hardware (all nylon):

4×	⅝" 6/32 bolt (binding head)
4×	6/32 hex nuts
4×	⅜", 0.14" ID standoff

All parts available from Mouser except where noted.

Passive infrared sensor schematic and board layout
Used by both the monochrome and RGB designs.

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Suggested parts

Resistor:

1× 10k 600mW

Transistor:

1×	SS8050CBU NPN BJT 40V 1.5A

LEDs (diffused):

1×	amber (e.g. LTL-1CHA)

Connectors:

3×	right-angle pin header

Sensors:

1×	PIR motion sensor (e.g. Adafruit 189)

Case:

1×	Acrylic box, 2" × 2" × ¾" Container Store 60220

All parts available from Mouser except where noted.

Depending on the transistors that you use, you may need to change the values of the pull-up and pull-down resistors and/or add additional ones.

In addition to the parts listed above, you'll need hookup wire, heatshrink tubing (for shrouding the ambient light sensor), and various female connectors. For the latter, cables recycled from computer cases work well.

These designs are licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

LED light strip dimmer circuits

About

Schematics

Resistors:

Capacitors:

Transistors:

Diodes:

LEDs (diffused):

ICs:

Power supply:

Connectors:

Sensors:

Circuit boards:

Case:

Mounting hardware (all nylon):

Wire:

Resistors:

Capacitor:

Transistors:

Diodes:

LED (diffused):

ICs:

Power supply:

Connectors:

Sensors:

Circuit board:

Case:

Mounting hardware (all nylon):

Resistor:

Transistor:

LEDs (diffused):

Connectors:

Sensors:

Case:

Photos

Monochrome mixer

RGB mixer

Passive infrared motion sensor

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