tag:blogger.com,1999:blog-1543389024527713336.post6831227411283590377..comments2024-02-14T10:44:15.547+01:00Comments on ArduPicLab: 4-20 mA current output for Arduino DueGiovanni Carrerahttp://www.blogger.com/profile/04443703611514833137noreply@blogger.comBlogger4125tag:blogger.com,1999:blog-1543389024527713336.post-72832738394716173532021-02-13T07:19:00.784+01:002021-02-13T07:19:00.784+01:00Hi, thanks for the appreciation. To understand wha...Hi, thanks for the appreciation. To understand what happened,<br />first you have to see, using a digital multimeter, if the DAC output has the values indicated on the diagram (with N = 0 and 4095), with margins of error of about +/- 5%. If the values are greater, the Arduino Due DAC or power supplies have a fault. However, the same voltage value must also be read on the emitter of Q1.Giovanni Carrerahttps://www.blogger.com/profile/04443703611514833137noreply@blogger.comtag:blogger.com,1999:blog-1543389024527713336.post-87535676562921800712021-02-12T12:51:01.258+01:002021-02-12T12:51:01.258+01:00Hi, thanks for your great articles, I used this ci...Hi, thanks for your great articles, I used this circuit in one of our designs and it worked great for a few months but started outputting 25ma when input was set to 50%(1.65v), should I have protection on the DAC side of the op amp as the DAC is now damaged? Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-1543389024527713336.post-85717139220622084662017-09-08T07:41:34.774+02:002017-09-08T07:41:34.774+02:00Hello,
My circuit is analog and, if well wired, sh...Hello,<br />My circuit is analog and, if well wired, should not create noise. I think the noise that you see in the oscilloscope is produced by a switching power supply, or anyway by switching circuits. Check ground returns and shields. GreetingsGiovanni Carrerahttps://www.blogger.com/profile/04443703611514833137noreply@blogger.comtag:blogger.com,1999:blog-1543389024527713336.post-31412552182162156902017-09-07T09:11:25.415+02:002017-09-07T09:11:25.415+02:00Hi, thanks for the article. I build it and int wor...Hi, thanks for the article. I build it and int work perfectly. expect a problem that i get into it. At the output of my circuit there is 40khz noise in load resistor. with current set to 10ma and 150ohm resistor in load i have 50mv P-P noise on load at 40khz frequency. Could you help me with that? here is the oscope image:<br />https://drive.google.com/file/d/0B3Zjyba3q2mIbTFpNVZlYkJIbHc/view?usp=sharing<br />Contact me with nazarian@outlook.com if its possible. thank you.Anonymoushttps://www.blogger.com/profile/15289774795284298437noreply@blogger.com