Reply to "Powering 1.5v lights for billboards"

Dale ManquenOGR Forum Member MEMORIALIZED MEMBER

quote:
if you have 1.5 volts bulb 15mA X 2
the total will be 3.0 volts 30 ma.

Not so. You will have 3.0 volts and 15mA for a series connection, or 1.5 volts and 30mA for a parallel connection. Your 300 ohm resistor is incorrect. It should be 600 ohms - 600 x .015 = 9V of drop for a series connection.

For a parallel connection, 350 x .030 = 10.5V of drop.

12/27/1110:56 AM

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