Hi all -
I recently came across a design that specifies a 2.8v reference to bias a circuit.
I've traditionally used programmable voltage regulators, but I'd like to build the circuit and wait for yet another parts order.
I have some 3.3v zeners and it seems that putting a resistor between the cathode and V+ allows me to adjust the voltage to the value I need.
What I'm wondering is how "bad" is this? I think I read voltage dividers have a 5% accuracy and basic zener shunts have a 4% accuracy... Am I looking at a 4.5% accuracy?
Are there small, simple improvements to make? Would a trimpot in place of the resistor be better or worse?
I recently came across a design that specifies a 2.8v reference to bias a circuit.
I've traditionally used programmable voltage regulators, but I'd like to build the circuit and wait for yet another parts order.
I have some 3.3v zeners and it seems that putting a resistor between the cathode and V+ allows me to adjust the voltage to the value I need.
What I'm wondering is how "bad" is this? I think I read voltage dividers have a 5% accuracy and basic zener shunts have a 4% accuracy... Am I looking at a 4.5% accuracy?
Are there small, simple improvements to make? Would a trimpot in place of the resistor be better or worse?