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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.

Oops!? I "fat-fingered" when I typed what was supposed to be "CD4009" in the Subject line.? ?I have now fixed that. Sorry for messing up the messages in some of your email folders. Andy

What you said is correct.? There are probably a few ways to make it work.? I am not an expert on the ways to do that. What you need is to apply the gate drive signal as a differential voltage

Just an FYI - it is not "attached".? It is "uploaded".? Nothing was attached to the message. That is the correct way to do it.? It was just stated wrongly. Andy

Cheng Fei Phung, I apologize for not replying sooner.? I was taking a look at your original oscillator circuit (with the schematic borrowed from a paper at the ieeexplore.ieee.org website).? I do

Hi! I am a LTSpice novice who is looking to simulate a CD4009 chip for a linear application. Specifically, in the electronotes newsletter #111, it is hinted that these can be used to make a simple

What are your opinions on the oscillation startup waveforms ( /g/LTspice/photo/302220/3915354?p=Created%2C%2C%2C20%2C2%2C0%2C0 ) and stable phase simulation waveforms (

There are a number of ways to skin that cat. In case of P and N FET design it may be possible to use high voltage BJT? to drive the upper half of the bridge. In case of N channel FET upper half there

There is another single pot tunable band pass network called Hall’s network. it can tune over a decade. The commercial worked example is used in the general radio model 1232a tuned amplifier/null

That was the undeliberated mistake. -- This email has been checked for viruses by AVG antivirus software. www.avg.com

Ok, I understand the misunderstanding. For me BW is always relative (octave or decade) Now, is really the output where it's on your schemo? I would put it at the opamp's output. There the amplitude is

Thanks: that's why a search for bandpass' failed. -- This email has been checked for viruses by AVG antivirus software. www.avg.com

DOH! Thanks, Mike. -- This email has been checked for viruses by AVG antivirus software. www.avg.com