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Thank you so much for your help and support, Andy!

Yes, and I posted that I understood the error. -- This email has been checked for viruses by AVG antivirus software. www.avg.com

@Andy See mosfets in weak inversion regions ( /g/LTspice/photo/302220/3915724?p=Created%2C%2C%2C20%2C2%2C0%2C0 ) Did I measure wrongly or had the wrong circuit connections compared to

Have you corrected the position of the OUT node?

Hi , I am trying to model the Ep10 core with T38 material from TDK micronas I have modelled the core but I am not sure whether it is correct or not ? How do I check my model ? Also it would be good if

I am just noting that the required op-amp model file (LM4562_NS.sub) is missing from your uploaded ZIP. UniversalOpamp2 works fine in its place. Andy ( #DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2 )

Perhaps I remember incorrectly.? But I thought all circuit diagrams in EDN articles were re-drawn by EDN's editors.? I do not recall seeing author-drawn schematics in their "Design Ideas" or

From Google, I found at least 3 versions of the 1232-A product manual.? All had scanned schematics, but not all were the same.? One of the downloadable PDFs (pearl-hifi.com) had several copies of

To which, John Woodgate replied: "General Radio" became "GenRad" and might be better known by that name.? Years ago, GenRad was bought out by JET Labs, who re-branded GenRad's products, and the name

I gave not seen RAP's original article. I looked the circuit up using John Woodgate's citation: "Analog Circuits: World Class Designs", edited by Bob Pease, page 236, "Multiple Feedback Bandpass

Thank you very much.

I haven't seen Pease's original diagram. I was going strictly by the EDN article. This is a recent article, and I know from experience that the EDN editors encourage writers to supply their own

https://www.kennethkuhn.com/electronics/hall_network.pdf for instance. Being lazy, I searched for "another single pot tunable band pass network called Hall’s network" DaveD KC0WJN

Yes, I referred to the circuit in the book, which has the op-amp inputs wired "correctly". After reading Tony's post, I looked at the EDN article. It took me a couple minutes to ascertain that circuit

Thank you:Do you have a reference to it? Google doesn't help, because the name has been re-used. The Pease circuit will tune over a decade with 100:1 change in R2 value, which is just about

Figure 1 was probably drawn by an EDN person. Bob's rough sketch is OK. I was taking the output from the wrong place.

You should also note, John, that there are errors in the EDN article. The first picture shows the opamp in non-inverting configuration - this is, of course positive feedback, and sure enough it will

The ones said to be in weak inversion zone so that they act as a very large resistor.? I do not know if it is a problem with biasing, or with sizes. What changed, that makes it oscillate now? Andy

Electronotes - wow, I have not heard of them in a long time. Somewhere, there mig

Which transistors are incorrectly biased, if I may ask ? I did not change much the asc circuit file, I had been doing some study on the circuit operation details theory.