Can someone tell me the most easy and cheaper method?
thank you~
Can someone tell me the most easy and cheaper method?
thank you~
Transistor with the collector load connected to 10V. Switched by a PWM output pin and then filtered with an RC.
Op-amp configured as non-inverting amplifier, gain of two.
can you tell me what should i buy? and the circuit diagram? Thank you..
because I am a beginner in electronic..
arduino no enough voltage to control k8064 dimmer...so I need 0-10v DC....but I don't know how to do it....
help~ :-[
For non inverting op amp you gain is (Rf/R1)+1
To get a gain of 2, Rf/R1 has to equal 1
Therefore you should use 2, 10k resistors
V+ has to be greater than 6+ volts and V- goes to ground.
Vin goes to you PWM pin out on the arduino
THANK YOU THANK YOU~ But what is that triangle?
thxthx~
That's the opamp, as discussed in the link you posted yourself earlier.
Sorry, I know you're new...you'll learn. Have fun
my last question...Which model opamp should i buy? thank you...
LM741CN OK??
I was about to say it would be fine, but the 741 is not rail to rail. You will not get all the way to zero, and you will need about 12 volts for the V+ line. If you use something like the LM324 op-amp, you will get much closer to 0V, you'll still need a source of 12V (good quality, filtered) for your 10V range. You will also need to filter your PWM output.
Thank you so much~~
but I don't know what is "filter your PWM output"?
"but I don't know what is "filter your PWM output"?"
OK. What you have to realise is that the 'analogue' out on the arduino is not really a true analog source. Think of it as a squarewave with variable mark space ratios. To send out a low voltage, the mark space if very small and the space is large, for a high voltage, the mark space is long and the space is very short. This is what is known as PWM (pulse width modulation).
You need to filter this. If you can use a resister capacitor network to filter out the on/off components such that the signal is smooth. When the mark space is high, the capacitor is charged up via the resistor. When the low 'space' appears (remember mark/space) the capacitor slowly discharges. The higher the resister value, the slower the capacitor charges which may have inpact on how quickly you can change control voltages. If the resistor is too low, the output will resemble a kind of sawtooth wave and not be smooth at all.
So you have to work out your resistor/capacitor values depending on the frequency of the PWM output.
But really, you should pop down to your local library and get a few books out on electronics. It would help you in the long run.
Thank you~~
I should buy some resister and capacitor~~ Thank you so much~~ :-[
Check out this link. It will help you understand about RC networks.
http://www.st-andrews.ac.uk/~www_pa/Scots_Guide/experiment/lowpass/lpf.html
The Triangle: http://focus.ti.com/lit/an/slod006b/slod006b.pdf
I used LM324N applied in this diagram...
but the voltage cant down to 0 V....(between 6V-11V)
why?
hello~~