My problems started when I bought things without having enough information. I didn´t know about this forum yet! But it´s my fault.
I have a good shotgun mic, sony C-74, and I bought the ma-100 adapter for my xl-1. I tried to get batteries for this mic but I learnt they were too expensive and hard to obtain. I looked for phantom suppliers in my city and I found a cheap one that I thought it was enough.
Result: with my xl-1, this mic, the ma 100 and the phantom supplier the input sound level is very low. I think everything is ok with my camera configuration.
What is wrong? preamp is the problem? (my ignorance about sound is remarkable but I want to learn!) Reading through the forums I have learnt about mm-1 sound device, beachtek products and so on. What can i do? Throwing away all what I bought (and the money with it)? Is there any solution?
Thank you for your patience to read this

I'm curious, what sort of phantom power supply are you using?

It´s a black box, XLR input output connections, fed by a 9V battery, 12-15V AC/DC supply....
as I am reading...perhaps my mic needs higher power than 12-15V?
Another question: I have used the mic twice. The first time I used it, it was fed by a mixer with phantom power. The sound level was acceptable. The problems came when I used this phantom power supplier.
The power or the preamp? The mixer had preamp for the mic I guess. Maybe the preamp of the camera is not enough for my mic?
Sorry if I am saying nonsense. Thank you for your patience

its not good, the 74 need 48v ph , you cant work with that box

Yeah you probably need a phantom power supply that supplies
48V... AKG & Shure have models that run off a 9V battery.