Hi all I need to build a bicolor led driver using a single input that alternates between 8-12V every 2 seconds. So at 8V, the LED lights to one color, and at 12V the other. Any ideas will be welcome.
- posted
16 years ago
bicolor led driver
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- posted
16 years ago
How about a diff amp: VCC VCC + + | | | | V -> V ->
- - | | | | | | |/ \\| In o-----| |-o 10V |>
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- posted
16 years ago
Sounds like a 555 project. D from BC
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- posted
16 years ago
How about with one bicolor LED and one resistor?
If the 8 and 12V are low enough impedance (can sink and source LED current), and if you can afford a little waste current (heat), and can supply constant 10V (is the 12V constantly available somewhere?), then tie one end of a bicolor LED to 10V through some current-limiting resistance, and the other end to your 8/12V source.
I've done this with an SPST switch and 4 resistors to operate a red/ green LED depending on the switch closure.