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Thanks VolkerR! That certainly clears things up. I was looking at it from the perspective that it was a digital output and so current flowing out would be marked "+", kind of like nodal and mesh equations. BrianG, Thanks also for your input. It's certainly interesting to see how...

I have a relatively simple question: Today when looking over some datasheets for digital buffers (74als652) I ran across specs for I(OH) and I(OL). For this particular device, I(OH) is -15mA and I(OL) is 24mA. I take this as meaning I can "source" a load (connected between my output...

Thanks again for the info! I've had a chance this week to implement the Burr-Brown REF102a part. Even with a cheap op-amp, this circuit was far better than what I had. Before I was seeing 50-100mV of drift, now it is almost not measurable with our Tek scope!! <The original circuit was a...

Thanks! I think the Burr-Brown part will work much better than what I have now. I guess I'll also have to go through my small &quot;library&quot; and look up the Widlar sources too. If you can think of anything else I should know, please feel free to beat me over the head with it. ;) Sorry...

Hi All, I'm currently working on a signal conditioning/isolation design for our products. Part of the design utilizes a constant-current source so that I can deal with bi-polar voltages. I am using a modified Howland, which incorporates a JFET and a LM313 instead of all the resistors. This...