Hello,
I want to turn on 88 leds in two modes DIM and BRIGHT.
The mode DIM is specified by low voltage (25VAC to 35VAC) and the current consumption must be between 5mA and 15 mA.
the mode Bright is specified by hight voltage (98VAC to 132VAC) and the current consumption must be between 5mA and 50 mA.
I should use passive components so I try to calculate the adequate current limiting resistor but it does'nt work when the voltage increases the current also increases and becomes out of specification.
can anyone help me to do this with passive components.
thank you,
I want to turn on 88 leds in two modes DIM and BRIGHT.
The mode DIM is specified by low voltage (25VAC to 35VAC) and the current consumption must be between 5mA and 15 mA.
the mode Bright is specified by hight voltage (98VAC to 132VAC) and the current consumption must be between 5mA and 50 mA.
I should use passive components so I try to calculate the adequate current limiting resistor but it does'nt work when the voltage increases the current also increases and becomes out of specification.
can anyone help me to do this with passive components.
thank you,