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why not 6V battery? even the bias of last transistor can be shifted to regulated voltage, leaving collector only to unregulated. Value of R8 can be re-calculated for the same collector current.oh crap, I forgot about that. what if I take out the lead acid battery?
will the 12V work then?
That shouldn't kill it unless there are high voltage spikes.
Was this a vehicle power supply by any chance?
Would you recommend adding an emitter resistor for 12V operation?
May be 10R will do.