Why OpAmp instead of transistor in dimming?

trunet · Post by **trunet** » Mon Mar 24, 2014 10:27 am

Hi,

Why did you choose to use an opamp instead of transistors to switch 0-5v to 0-10v?

Thanks,

Wagner

rimai · Post by **rimai** » Mon Mar 24, 2014 10:34 am

Current source capability and easy to adjust gain multiplier.

trunet · Post by **trunet** » Mon Mar 24, 2014 10:42 am

The gain is really an advantage. But why do you need current source capability for a simple PWM signal?

rimai · Post by **rimai** » Mon Mar 24, 2014 10:47 am

Not all drivers are made equal.
You would be surprised how much current is drawn when you connect multiple drivers to the same port.
Besides, the port can also drive the LED moonlights without any other additional component.

trunet · Post by **trunet** » Mon Mar 24, 2014 10:49 am

thank you very much for the answers Roberto.

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