Recent content by Joseph M. Zias

Thanks for the hints. I have a copy of the lab book and my old 1972 lab notes. I took a course called Advanced High School Labs that used the ECCP material. I have found the analog computer was an AMF 665/D. There was also a larger class demo unit, I think 775. There are new analog...

Does anyone have or know where I could buy a Lab Kit for the old series Man Made World by Engineering Concepts Curriculum Project. I have a lab book and my set of completed labs from 1972 but I would like to find the lab materials, including the analog computer.

Very true. I have the DVD from Dr.Middlebrook's old Ardem website, a DVD I cherish - 20 hours of video. I also attended a 1 week seminar by Dr.'s Middlebrook and Cuk back about 1985 or so. In 1975 I completed my thesis using a Systron-Donner 1020 analog computer. Being young I miss!

Thankyou, Baluncore (nice name). I am getting use to using LTSpice and used your netlist along with adding components needed for compensation and to have a non-inverting amplifier. The bode plots look very good and the values are close to my own measurements. Attached is my txt file should...

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...