I have been looking at the diagram for the 3CU injection and the amplifier.
I 've noticed that both wires for each injector are connected to the ampli.
Why does one have to design an ampli in the way to take control of both power lines for an injector. Normally one would expect that controlling the current over one of the power lines to each injector could deliver full control of the current through it? (which is normally done over the negative wire over a power transistor). Any thoughts??