Really depends on the LED.
The purpose of having the LEDs opposite polarity of each other is that LEDs
have a finite reverse voltage limit. By placing them back to back the
'on' led protects the 'off' led from getting too much voltage, since the
'on' led will be limiting the voltage to whatever
20mA is a safe assumption
Sent from my iPhone
> On Apr 12, 2018, at 8:02 PM, Bill Prince wrote:
>
>
> We have an electric gate for our little neighborhood. The keypad uses a
> little circuit board with a pair of white LEDs mounted on a tiny circuit
> board to light the keypad. The little cir
