Hello,
I require a very steady voltage reference of 2.5VDC. So I calculated a voltage divider using a 2.8K(R1-connected to ground) and 820ohms(R2-conmected to Vcc) connected to an approximately 3.34VDC VCC source. Please note R1 resistor value is approximate since I am really using a potentiometer in series to fine tune the voltage divider.
When I measure the voltage in the middle of these resistors I get an approximate 2.5VDC BUT very unsteady.. voltage varies from 2.489VDC to 2.540VDC... Why does it dance around like this? Voltage is voltage... shouldn't the VR1 and VR2 Vdrops be steady. What's going on?
I am thinking of using a voltage reference, but does this mean that to keep a very steady voltage of 2.5 VDC, the voltage reference component will be working like mad to achieve this?? Also won't that be bad for the voltage reference in terms of its durability.
Also, would I be able to use a simple transistor with a feedback configuration and fixed bias to 2.5VDC as a voltage reference... just asking!
thanks for all comments.
r
I require a very steady voltage reference of 2.5VDC. So I calculated a voltage divider using a 2.8K(R1-connected to ground) and 820ohms(R2-conmected to Vcc) connected to an approximately 3.34VDC VCC source. Please note R1 resistor value is approximate since I am really using a potentiometer in series to fine tune the voltage divider.
When I measure the voltage in the middle of these resistors I get an approximate 2.5VDC BUT very unsteady.. voltage varies from 2.489VDC to 2.540VDC... Why does it dance around like this? Voltage is voltage... shouldn't the VR1 and VR2 Vdrops be steady. What's going on?
I am thinking of using a voltage reference, but does this mean that to keep a very steady voltage of 2.5 VDC, the voltage reference component will be working like mad to achieve this?? Also won't that be bad for the voltage reference in terms of its durability.
Also, would I be able to use a simple transistor with a feedback configuration and fixed bias to 2.5VDC as a voltage reference... just asking!
thanks for all comments.
r