This is a circuit for a signal system for a large scale outdoor model railroad that was designed by someone else.
I want to upgrade the system using 10mm LEDs and they have a different Forward Voltage than the 5mm as designed.
I do not understand how to calculate needed resistor values since the circuit has LEDs in parallel with resistors.
Please help me understand the circuit and how to calculate resistor value for new LEDs.
Power supply is 12V battery with solar charger to keep it up.
*** Original LEDs
Forward Voltage = 1.9-2.02V
Forward current = 20mA
*** New LEDs
Forward Voltage = 2.4V
Forward Current = 20mA
Thanks in advance - http://www.csppry.org
I want to upgrade the system using 10mm LEDs and they have a different Forward Voltage than the 5mm as designed.
I do not understand how to calculate needed resistor values since the circuit has LEDs in parallel with resistors.
Please help me understand the circuit and how to calculate resistor value for new LEDs.
Power supply is 12V battery with solar charger to keep it up.
*** Original LEDs
Forward Voltage = 1.9-2.02V
Forward current = 20mA
*** New LEDs
Forward Voltage = 2.4V
Forward Current = 20mA
Thanks in advance - http://www.csppry.org
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