Recent content by AzHole

I'll make the changes and add that transistor in (had a feeling he needed to go in the path). A motor is one type of attachment that may or may not go onto the connector. There are a few other devices that may go into that channel (there's 4 channels on the design), such as a relay or other...

http://www.micrel.com/_PDF/mic7111.pdf is the data sheet on the OpAmp. The info sheet says it handles rail-to-rail, but I can't find the datasheet entry you're looking for in it (either that or I'm just being blind again...). The LED in the schematic can be ignored. I was using Electronics...

I think the 250 Ohm output resistor was a left-over when I was trying something out so that one can easily be taken out. I wasn't sure if a pulldown was needed so I threw one in anyways, so again, easily removed (didn't notice the R2R was performing the same funciton as it as you point out). I...

One last try! The 741 is just what the workbench put there (it's from 1997). I'm actually looking at a MIC7111 OpAmp (25uA Supply to 100mA Current Output at 1.8V to 11V) for use in it. I apologize if this has been annoying for you, but I appreciate the responses. I've been doing some...

Ok, so something more like this schematic? My testing bench is telling me that with the R2R later setup this way, the mA coming out the output (heading to the LED) changes depending on which I/O port (A-D) is currenlty on. I'm not real sure if this is the case, or if it's just this very old...

Thank you for the R2R ladder info, that does look quite interesting. However, if my I/O can still only source 20mA, doesn't that mean the ladder itself can still only source that much? There's going to be 4 sets of these (16 I/Os total, 4 channels each), and the total output from my logic is...

Bah...just realized that with R6, when an I/O isn't firing, the Output Voltage line will have 5v on it because of R6. So that kind of screws it. All I'm trying to do is regulate that when no I/O is fired, there is not voltage on the Ouput Voltage line. Looks like I'll need another MOS or...

I'm working on a design that requires me to control the output voltage on a line that will be used to drive a motor or other item. http://www.az-prod.com/vregcheck.jpg" The above link goes to the schematic I have in mind. Please ignore the MOSFET symbols, I'm pretty sure I used a...