I want to convert the Arduino PWM output that is in the range of 0 - 5V to an analog output in the range of 0-10V.
I have uploaded the circuit I have designed.
The circuit can be divided in two parts:
1) An RC filter to get an analog output from the PWM signal that Arduino outputs. I have read some information about this kind of filters and it's seems that there is a rule that establish the relation between the time constant of the RC filter and the period of the PWM signal: the RC time contant should be greater than the period. In my case the time constant is 100 times greater.
2) An operational amplifier with a gain of 2 to obtain the output in the range of 0-10V.
I have made some test with the circuit and seems to work properly but I don't have much experience with electronics so I would be grateful if someone can check if the design is correct.
Thanks in advance.
Edited by ghiro, 19 March 2010 - 02:16 PM.