Ravingsofthesane
New Member
Hello everyone ,
Hoping someone can give me a little assistance .. My knowlegde of the component designing process is very limited.
My goal in this is pretty basic .. I want to light 2 L.E.D's but with the following specs.
1. Using Pots to control the LED brightness
2. Use a Photocell to turn on the lights automaticlly at dark.
I am using a wall wart with 7.5 incoming voltage ... going off of some basic information I am seeing that to light a red LEd with with a forward voltage of 2.0 I will need a resistance of 330ohms and to light A white LED with a forward voltage of 3.3 I need resistance of 220ohms.
The first few questions are how to use the Pots to to control this .. do I use it in series with a resistor , or will the pots alone work? and what should I look for in buying the pots?
I am attaching a simple graphic to how I "think" this circuit needs to be done .. it was a quick work in MS Paint so please be kind
thanks in advance to anyone who can offer some assistance.
-R
Hoping someone can give me a little assistance .. My knowlegde of the component designing process is very limited.
My goal in this is pretty basic .. I want to light 2 L.E.D's but with the following specs.
1. Using Pots to control the LED brightness
2. Use a Photocell to turn on the lights automaticlly at dark.
I am using a wall wart with 7.5 incoming voltage ... going off of some basic information I am seeing that to light a red LEd with with a forward voltage of 2.0 I will need a resistance of 330ohms and to light A white LED with a forward voltage of 3.3 I need resistance of 220ohms.
The first few questions are how to use the Pots to to control this .. do I use it in series with a resistor , or will the pots alone work? and what should I look for in buying the pots?
I am attaching a simple graphic to how I "think" this circuit needs to be done .. it was a quick work in MS Paint so please be kind
thanks in advance to anyone who can offer some assistance.
-R