The ones we are using are the 24 volt model. You can usually find them on ebay. I just bought one five minutes ago for $33, including shipping, and have a bid in on one for $15 plus 30 shipping.
Dave
Dave
…. there is a logical progression step by step even if it does seem a little insane at times. Being a Radio Amateur as well as an electrician perhaps I view things a little skewed . Or maybe I have factored in a few more outrageous possibilities I do know I have drawn those circuits by intention not accident
.. and the circuits and particularly the Wheatstone bridge you drew allowed me to see more of the picture.

but it also pulled me along by the nose ring too and vola! There's the next piece I didn't just stumble upon it … I was looking for it. And If you hadn't drawn the Wheatstone bridge I certainly would not have been.
… as for the control there are two ways to approach IMHO , the one I've drawn is I think the easiest and that is to make the impedance .. power transfer .. to the battery appear so huge as to be “infinite” - that is how I've drawn it and is one of the reasons for the air gaps. That is “the preferred method” IMHO however there are of course other alternatives using quite easy feed back loops with dirt cheap ICs a very simple book explaining all this with practical circuits and schematics is
… I'm quite sure they will prove equally useless now … Indeed I am a so called electrical engineer myself and I have had to spend hours and hours un - learning and trying to get rid of the stuff I was force fed,
so I think you can forget the Idea of a “really good electrical engineer” anyone who's classically trained is about as much use here as “tits on a kipper”

to my genius friends!


to my genius friends!



but it also pulled me along by the nose ring too and vola! There's the next piece I didn't just stumble upon it … I was looking for it. 


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