I am trying to use an arduino due to control the following http://www.vellemanprojects.eu/products/view/?id=354314 dc dimmer for an ac fan.As far as I understand it the dimmer requires a dc input between 0v and 12v to control the ac fan with 0v stopping the fan and 12v for max speed.I thought about using the DAC output and amplifying the dac output from the due.Is this the right way to do it and how do I amplify the signal?A quick search on Google makes me think that I need an op amp circuit to amplify the signal. Can somebody point me to a suitable circuit for this or suggest a better alternative?Thanks
Thanks for your replies.I will try stimmers idea number 2.Thanks again.
I've recently been experimenting with something similar. I need to convert the DAC output range 0.55V-2.75V (approx.) to 0V-5V. So the DAC output needs to be offset by -0.55V and have a gain of about 2.3 applied. The best results so far are with a differential op amp circuit. I can feed the DAC into one input, +0.55V into the other and get an output in the range 0V-2.2V. The overall gain of the amp can be adjusted to give a maximum of 5V. There are lots of examples of differential op amp circuits online.I prefer this to the summing circuit because I don't have -0.55V available.BTW, I would recommend buffering the DAC output when experimenting with it. I managed to kill one of mine somehow. I think I've read that they are not very robust.