2 types of amperage sources

Nice.....Both circuits appear to perform the same general operation of keeping the output current similar to the input current regardless of altering the voltage. The slight alteration in design for the left circuit compared to the right circuit may be to do with one circuit being better than the other for small or large current values? The main thing is that each transistor base should receive an appropriate current to draw more current between its collector-emitter, which in turn will continue likewise to the base of the next transistor (although by doing so, the divider balances will be altered and more or less current will be drawn directly into a base as well as that from the previous transistor's output). We can't usually see the flow of current dots in E.C. where that flow is very small, but I think that it is important to be able to do that in order to get an overall idea of what is happening at any point in a circuit, especially regarding divider balance......so here is what I do: zoom well and stare at each resistor.....On close examination you may see the dim current dots slowly passing through. Then alter a resistor value somewhere and see how it effects the flow on close examination. If there is no resistor examination point, then make a temporary one wherever you wish with just one ohm. After doing that procedure in many circuits, you get to see all the relative current flows and develop a better awareness of the importance and alteration of dividers....having seen the 'invisible' small flows. I don't know whether that helps you, but it works for me and it is how I managed to get a previously non-working rectifier circuit in to a better state in my previous article here on E.C.

Also....try turning the volt supply up a little or to a rediculous amount of eg. 3000v on EC just to make the current dot flow visible, bearing in mind that such a temporary procedure may alter something untoward (goodbye LED).

Errata: read regulator circuit instead of rectifier circuit Pity we can't alter these replies, but then that facility could easilly be abused.

Cool. I try it. Thankyou, 2ctiby :-)