How to shoot with multiple camcorders with just one audio source

[onewithtwo]

I have 2-HFG70's and 1-HFG50 and would like to record video from different angles with all three simultaneously. I'm most concerned for a single audio source. I've done a moderate amount of research and would like to avoid using software and spending a ton of money. Quality should be good but need not be the best that can be achieved. I'd like to hook up just a single boom mic to all three cameras. The cameras would all be within 15 ft of each other. Instructions, using a mixer or switcher are lost on me. Specific description of models and cables and inputs and outputs etc would be appreciated. 

[shadowsports]

Greetings,

"Using a mixer or switcher are lost on me. Specific description of models and cables and inputs and outputs etc would be appreciated".

A audio splitter / mixer / amp would be needed.  You need to do more research.  Here is some info that may help.  The G50 supports mic and line level inputs via 3.5mm.  the G70 supports mic only input via 3.5mm. For a single audio source, the Rolls DA134 4 channel amp might be a good option.  Check it out on B&H's website.  Other accessories may be needed depending on the brand and model of the mic.  This should get you started 😉.