Power Injection Techniques
Power Injection Techniques
Why Inject Power?
Voltage drop causes:
- Dim LEDs at the far end of the strip
- Color shift toward red (lower voltage means red looks brighter than blue/green)
- Flickering on bright scenes
- Random pixel glitches
Injection Points
| Strip length | 5V injection | 12V injection | 24V injection |
|---|---|---|---|
| 0-3m | Single end | Single end | Single end |
| 3-5m | Both ends | Single end | Single end |
| 5-10m | Every 3m | Both ends | Single end |
| 10-15m | Every 2-3m | Every 5m | Both ends |
| 15-20m | — | Every 5m | Every 8-10m |
How to Inject
At the end of the strip:
[PSU +] ─── Wire (18-14 AWG) ─── Strip end +
[PSU -] ─── Wire (18-14 AWG) ─── Strip end -In the middle:
- Cut strip at designated cut point (every ~1m or 3 LEDs)
- Solder injection wire to +, -, and D pads
- Connect wire back to PSU
Fusing
Every injection point must be fused! An unfused injection point is a fire hazard if a short occurs.
- Blade fuses (ATO/Mini) — easy to replace
- PTC resettable fuses — auto-reset, no replacement needed
- Fuse rating = 80% of wire ampacity (e.g., 18AWG = 10A, fuse at 8A)