I'm getting confused about how zener diodes are rated and could use some help.
I have a Motorola 2-way handheld radio that I need to wire for an external speaker. The connector on the radio has a pin which is used to select between internal and external audio.
The pin is tied high to +5V by a 20k Ohm resistor and needs to be pulled down to 1.24V to enable external audio.
So, am I looking for a 1.24V zener or a 3.76? Does the amount of current flowing through the resistor come into play?
I have a Motorola 2-way handheld radio that I need to wire for an external speaker. The connector on the radio has a pin which is used to select between internal and external audio.
The pin is tied high to +5V by a 20k Ohm resistor and needs to be pulled down to 1.24V to enable external audio.
So, am I looking for a 1.24V zener or a 3.76? Does the amount of current flowing through the resistor come into play?