Author Topic: Power injection  (Read 317 times)

Offline Xmas!

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Power injection
« on: January 24, 2019, 07:09:23 AM »
Do Ray Wu's (and others) power injection T pigtails isolate the V+ while combining the V-? Thanks.


Currently I have 1 F8 powered by PSU #1, 1 F8 powered by PSU #2, and my F16 powered off PSU #3. Would it be better to combine 1 F8 with the left side of the F16 and 1 F8 with the right side of the F16 for power injection purposes?
« Last Edit: January 24, 2019, 07:20:18 AM by Xmas! »
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Offline Ulan

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Re: Power injection
« Reply #1 on: January 24, 2019, 01:37:46 PM »
I'm very new as well but I think he has both types of injection splitters.


for example this one, the diagram shows it shares the +V so it would only work if all the power is from the same supply.
https://www.aliexpress.com/store/product/3-2-3-xConnect-3-core-T-type-waterproof-splitter-the-middle-is-2core-with/701799_32947628043.html?spm=2114.12010612.8148356.16.25a54fefft0RwI


This one breaks the +V but shares a ground.  I think on this one you choose to push the power up or down stream based on which pin you wire to the +V of the power supply.
https://www.aliexpress.com/store/product/3-3-3-for-power-injection-13-5mm-series-3-core-T-type-waterproof-splitter/701799_32900104998.html?spm=2114.12010615.8148356.4.30d331dcK2cTfO


I'm pretty sure you don't want to mix +V from different supplies unless the power supply supports parallel chaining.   :)

Offline Todd

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Re: Power injection
« Reply #2 on: January 24, 2019, 06:59:07 PM »
I'm very new as well but I think he has both types of injection splitters.


for example this one, the diagram shows it shares the +V so it would only work if all the power is from the same supply.
https://www.aliexpress.com/store/product/3-2-3-xConnect-3-core-T-type-waterproof-splitter-the-middle-is-2core-with/701799_32947628043.html?spm=2114.12010612.8148356.16.25a54fefft0RwI


This one breaks the +V but shares a ground.  I think on this one you choose to push the power up or down stream based on which pin you wire to the +V of the power supply.
https://www.aliexpress.com/store/product/3-3-3-for-power-injection-13-5mm-series-3-core-T-type-waterproof-splitter/701799_32900104998.html?spm=2114.12010615.8148356.4.30d331dcK2cTfO


I'm pretty sure you don't want to mix +V from different supplies unless the power supply supports parallel chaining.   :)
d




You are correct. No v+ together v- is tied together
Todd L.
Kimberly, WI

Falcon F16V3 F48, FPP, X-Lights, LOR, Pi 3B

Offline JonB256

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Re: Power injection
« Reply #3 on: January 24, 2019, 07:42:14 PM »
My RayWu T's do NOT break the V+ and I use three different power supplies.

There are 96 or 144 pixels between injection points. With that amount of Pixels and conductor length between injections, breaking V+ is not needed.
I run a small gauge wire between all 3 V- outputs. Worked great for 4 seasons. (27 Boscoyo snowflakes, 48 pixels per flake)

I prefer this type of T because it balances voltage in both directions from the injection point.

 

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