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As Steve said .... BTW when running your car puts out 13.5 volts !
The Power Loss math is analog voltage drop times current.
Power = 13.5v - 8.5v x current = 5v x 6amp = 30 WATTS of HEAT !!!
No it wont. pass transistor/Regulator circuits at <10 amps float around 80% efficiency if the input voltage is selected properly. sure, switch-mode will be more efficient, but for cost, linear is hard to beat.
That's why reading the question is SO important
Any circuit to drop 12v to 8.5V at 6amps.
Which he illustrated with a linear circuit, and Lo ! it dissipates 21W, because THAT'S THE SPEC. He CAN'T select the input voltage. Yes, as a PE for the last 30 years, I am very aware of the benefits of linear regulators in the right places.
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