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Why OpAmp instead of transistor in dimming?
Posted: Mon Mar 24, 2014 10:27 am
by trunet
Hi,
Why did you choose to use an opamp instead of transistors to switch 0-5v to 0-10v?
Thanks,
Wagner
Re: Why OpAmp instead of transistor in dimming?
Posted: Mon Mar 24, 2014 10:34 am
by rimai
Current source capability and easy to adjust gain multiplier.
Re: Why OpAmp instead of transistor in dimming?
Posted: Mon Mar 24, 2014 10:42 am
by trunet
The gain is really an advantage. But why do you need current source capability for a simple PWM signal?
Re: Why OpAmp instead of transistor in dimming?
Posted: Mon Mar 24, 2014 10:47 am
by rimai
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.
Re: Why OpAmp instead of transistor in dimming?
Posted: Mon Mar 24, 2014 10:49 am
by trunet
thank you very much for the answers Roberto.