- #1

Planobilly

- 440

- 105

Say I had a 10VDC supply and I need around 3.3VDC at 30ma. Let's say the 3.3VDC will power a LED.

V1= 10VDC

R1= 82 ohms

R2= 47 ohms

V2= 3.64 VDC from the junction to ground

I= 28.24ma....I guess

I don't know what effect the LED will have on the circuit and I don't understand how to find the resistance of a LED.

I ASSUME in general the value or R1 and R2 in a voltage divider is based on the needed current through the load. I have zero idea of the effect of other components that could be in a circuit passed the LED supplied by the same 10VDC supply.

I don't have a simple drawing program to draw the above circuit. Recommendations for a simple drawing program would help.

Bottom line, as a concept: I ASSUME a voltage divider can be used to control both voltage and current. Is this correct.

Cheers,

Billy

V1= 10VDC

R1= 82 ohms

R2= 47 ohms

V2= 3.64 VDC from the junction to ground

I= 28.24ma....I guess

I don't know what effect the LED will have on the circuit and I don't understand how to find the resistance of a LED.

I ASSUME in general the value or R1 and R2 in a voltage divider is based on the needed current through the load. I have zero idea of the effect of other components that could be in a circuit passed the LED supplied by the same 10VDC supply.

I don't have a simple drawing program to draw the above circuit. Recommendations for a simple drawing program would help.

Bottom line, as a concept: I ASSUME a voltage divider can be used to control both voltage and current. Is this correct.

Cheers,

Billy

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