Introduction: (written 5-26-2007)

This circuit is designed to be used with my rechargeable 12.5V outdoor Power Pack, and the Tent Light's Power Distribution Box is designed to act as a power hub, providing access points (DC power jacks) for other devices to connect to the 12.5V power buss.

*I customized a SONY stereo power supply to receive external DC from my Power Pack (or any other 11-40VDC source).  See my 9VDC Supply for SONY Stereo.

Tent Light - Halogen Bulb & LEDs

Devin R Ott
Design - May 2006
Final Assembly - May 2006

Description:

Tent Light employs 6V halogen bulb and multicolor LED array, mounted together in a Light Fixture.  The Light Fixture mounts to the inside roof of my 10'x10' tent, and is controlled by a hand-held Wired Remote conveniently accessible from nearly any location in the tent.

Tent Light has two modes of operation: Bulb or LED. 

• Bulb mode:  halogen bulb brightness is adjusted by the bulb brightness potentiometer. 

• LED mode:  LED brightness is adjusted by three potentiometers (one for each color: red, green, blue).

Wired remote: low-power design ― 24AWG, 9-conductor cable interface.

• Uses low-current logic signals to trigger high-current relays in Light Fixture. 

• Uses potentiometer reference voltages to control high-current supply voltages in Light Fixture . 

Power Distribution Box: establishes main power buss with access points (DC power jacks) for additional devices to receive power.

Requires 12VDC @ 1A max

User Operation: 

• Power Distribution Switch ― DPST ― connects main power buss to external 12VDC supply.

• Tent Light Power/Function Switch ― DPDT (center OFF) ― located on Wired Remote.

ON-Bulb:   turns ON halogen bulb ― triggers relay#2 and sends power to OPA4277 op-amp buffer circuit. 

OFF:        OFF

ON-LEDs:  turns ON LEDs (R,G,B) ― triggers relay#1 and sends power to OPA4277 op-amp buffer circuit.

• Bulb Brightness ― 5kΩ POT ― controls supply voltage of HPR50 halogen bulb.

*Bulb circuit is designed to have a minimum brightness limit.  Bulb can not be dimmed beyond this minimum brightness.

• Red LED Brightness ― 10kΩ POT ― controls supply voltage of 810JPF4D red LED array.

• Green LED Brightness ― 10kΩ POT ― controls supply voltage of 500TG4DF Green LED array.

• Blue LED Brightness ― 10kΩ POT ― controls supply voltage of 500TB4DF Blue LED array.

*LEDs in the Tent Light can be dimmed all the way down to their non-conducting (OFF) state so that any combination of the three colors can be achieved.

Tent Light Wiring Diagram 

Final Assembly: Tent Light  *click image for medium size, click hyperlink for large size (where available)

Complete Tent Light

    (Large)

Power Distribution Box

(Large)

Wired Remote:

Circuit Operation:

***coming soon***

Final Assembly: Wired Remote  *click image for medium size, click hyperlink for large size (where available)

  (Large)  (Large)

Light Fixture:

Circuit Operation:

***coming soon***

Final Assembly: Light Fixture  *click image for medium size, click hyperlink for large size (where available)

Fixture

Adjustable Voltage Supplies for LEDs & Bulb   

(Large)  (Large)  (Large) 

LED Array

(Large)  (Large)     

LED Array: schematics

All Photos:

Final Assembly: Tent Light  *click image for medium size, click hyperlink for large size (where available)

Complete Tent Light

    (Large)

Power Distribution Box

(Large)

Wired Remote 

  (Large)  (Large)

Fixture

Adjustable Voltage Supplies for LEDs & Bulb   

(Large)  (Large)  (Large) 

LED Array

(Large)  (Large)     

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