Review: BenQ GP1 Joybee LED Projector, using portable power, 12v deep-cycle battery

I have a portable cinema set-up that is suitable for camping trips, festivals, parties, etc...

Here is the equipment list;
• Portable projector on a tripod
• External media player (USB)
• Self-powered speakers (AA batteries)
• Portable cinema screen
• 12 volt deep-cycle battery
• DC converters - 12v to 18v, 12v to 6v

The only snag is that the DC power supply seems to be creating horizontal lines on the projector output. This is my best guess as to the source of the horizontal lines problem you can see in the video as the problem does not occur when I run the projector from mains power. I can live with this snag, it is still an excellent experience to enjoy cinema in a remote location.

Category:

Howto & Style

Tags:

• BenQ
• GP1
• Joybee
• LED Projector
• portable projector
• pico projector
• tech review
• camping

[lvxonyx]

It was an old Western Digital media player.

[deelkar]

Your step-up converter internal frequency might cause those stripes. You might fare better if you use 2 12V batteries and use step-down converters or linear regulators (a bit wasteful, but no distortions) to get to the voltages you need.

[lvxonyx]

@deelkar Thank you, great advice!

[maikcook978]

What kind of external media player are you using?