Reply to "PS2/3 smoke unit input voltage"

Vernon BarryOGR Forum Member SUPPORTING MEMBERDIGITAL SUBSCRIBER

@Darrell posted:
I looked up the regulator on the 6v board, it's rated at 1 amp.

Right, but it's a linear regulator. That means it wastes a TON of heat proportional to the load. Example, 18V DC, 6V regulator, it's dropping 18-6=12V. More appropriate wording is converting 12V and proportional load current to HEAT.

Example Williams regulator from the Baldwin. 780X series with 1A diodes as the rectifier

Smoke Regulator [O Baldwin 4-6-0) - Click Image to Close

Using an online linear regulator heat/power calculator:

18V source

6V linear regulator

750mA load current

= 9 Watts of heat from the regulator (12V times 750mA)

Meanwhile, the smoke resistor only sees 6V times 750mA= 4.5 Watts

2/25/231:44 AM

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