These Low voltage regulators Circuit Diagram short-circuit protected regulators give 6, 7, and 9 V from an
automobile battery supply of 13 V nominal; however, they will function
just as well if connected to a smoothed dc output from a
transformer/rectifier circuit. Two types are shown for both positive and
negative ground systems. The power transistors can be mounted on the
heatsink without a mica insulating spacer thus allowing for greater
cooling efficiency. Both circuits are protected against overload or
short-circuits. The current cannot exceed 330 mA.
Under normal operating conditions the voltage across R2 does not rise above the 500 mV necessary to turn Q2 on and the circuit behaves as if there was only Q1 present. If excessive current is drawn, Q2 turns on and cuts off Ql, protecting the regulating transistor. The table gives the values of Rl for different zener voltages.
Low voltage regulators Circuit Diagram
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