Optocoupler voltage control

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hello everyone,

i trying figure out how control input voltage. building i/o controller take range of voltages (5-30vdc) , of course
use trigger input on arduino.

i have built , works concerned resistor getting hot. 4n25 opto, 2.7k resistor inline led input on the
opto.

my thought cannot dissipate heat properly. otherwise works great.

my question is, there type of zener or other voltage limiting device can control voltage , clamp large range of
inputs not burn resistors up?

any suggestions appreciated.

lm317 in constant current mode

what makes think resistor going hot anyway?


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