Recent content by Joseph M. Zias

Using method 1. I chose to have the operating point calculated. However, after choosing "run" the program says "This circuit does not contain a node other than node 0, gnd."

I have LT spice but I don't haven't been able to load this file into it. Can you give me some instructions on doing that?

Looks like I am going to have to get LT Spice downloaded.

I have the schematic but not a spice program. Will have to look into getting one. However, using the open loop curves of Fairchild and doing some backtracking I find: With C1=10pf and R1=0, the breakpoint looks to be 10khz. That would give an equivalent resistance working with C1 of 15.9 k...

Most likely this can only be answered by an "old timer". I am making measurements on an uA709 op amp (metal can). I would like to calculate the frequency rolloff curves (I can measure them). I assume the compensation is via the miller effect. To do the calculations I would need to know the...

I think we can close this thread. I found the enthalpy of H2O l is different that the enthalpy of H2Og so apparently the PV work is included when a gas is involved.

Do the published values of Enthalpy include the work done against a constant pressure, e.g., the atmosphere? (I am not a chemist). I am reviewing enthalpy and entropy as part of the statistical mechanics applied to transistors. I assume, from my reading, that the work done would mostly apply...

Revisiting a feedback loop circuit of decades ago. I have two uA709s and 3 more on the way (Ebay). But I thought I would check to see if any "new" op amps have the same feature. Being able to tailor the response allows for some interesting experiments, for example, inserting a right half...

Does anyone know of a modern op-amp (available) with a frequency compensation input as the very old 709 had?

Dave, A very good reply. I attended one of Middlebrook/Cuk seminars in 1984 and bought his DVD years later from his group Ardem.

Some of the great Analog Engineers and Teachers have passed; Bob Pease, Jim Williams, R. David Middlebrook. I would like to inform/remind engineers and students interested in Analog Design of Dr. R.David Middlebrooks work. He was a prolific author and many of his papers are available through...

It seems that in the case of Velocity vs time we can draw the graph and calculate distance or acceleration but are we then also saying that is not permissible to draw a vector since the magnitude is is undefined or not permitted? My similar question in the EE group regarding the S plane seems...

Well, very good comments and I think takes care of the S plane. Comments on the physics site are interesting.

Please explain.

Good point that radians are essentially dimensionless. In this case we have a magnitude of sec^-1 and then divide it up appropriately; as you note the real part gets nepers per second and the imaginary part gets radians per second. However, we could have also used frequency for the vertical...