Possible New Battery Solution?

Gap,
Not fully understanding such Electronics I am inclined ro say Wibble. However I do know that they work and would love to understand this even though I could make one if I managed to get the parts.
Some questions:-
1 However my rudimentary knowledge asks where is the Negative?
2 Are both connected to the little inverted Triangle at the bottom of the circuit?
3 What was the quality of Control like on the one you created?
4 Good Slow speed for Shunting?
Thanks for posting the concept of what appears to be a modest upgrade.
JonD

Replace the earth symbol (little inverted Triangle) with negative.
Vin is the positive and in the picture it is equal to or greater than 28V.

The voltage control on the ones that I built (three in all) was as good as if not better than the ones commercially available at the time (read 1990s), not as good as the PWM ones (which was the next step in control before DECC appeared) I built later but for the purpose they worked well.

Looking at the receiver again I noticed that their output is PWM, this will not work with the LM338 without the PWM signal being converted to an analogue output voltage. This simple circuit should work to do that.

dac_high.jpg
 
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