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I've learned there's two anti-RIAA filters you put at the input of preamp to be simulated: the laplace on and and RC passive one. All my sims with RIAA premps have the passive filter at the input,

Hi, i have been interested in bipolar NDR devices similar to the Lambda-Diode and did some basic simulations which i can share later, if there is interest. I can also recommend the publications by

A constant power load is an example of a circuit with negative resistance. A common example of a constant power load is a switch-mode converter. Quite a few SMPS designers don't appreciate this. Try

The circuit referenced in this note does have the advantage of using only NPN transistors and no zener. However, the I/V curve is less well defined and you have less control over the peak/valley

Along a similar line, this circuit placed in LTspice, provides negative conductance. Generate a single DC source sweep on applied V and monitor source current.

Actually, you can tell quite a lot about even an audio circuit's performance, by looking at its square wave response.? Tilt in the flat tops or ringing on the edges tells you that something is amiss

A negative resistance circuit with brief description has been uploaded to: /g/LTspice/album?id=301539 Have fun Jim

Andy, I saw that.? Am going through advisories and FAQ? - currently the basic beginner's tutorial- and come up to speed with any and all of relevance. Appreciate the leg up! -- William, k6whp

RIAA is intended for audio applications. Why in the world would you even think of square wave input? OK, transient over-load behavior might be one reason, but I think that the OP is a long ways from

I think I have the circuit you need. It is circa-1965 and uses 3-4 bipolar transistors, a zener diode, and a handful of resistors. All components are "garden variety" with nothing special. It works to

Andy, Thank you. I was to have uploaded the .asc file into temp per the group protocol but your answer will suffice. Appreciate the advisory and support. -- William, k6whp -------------------- "Cheer

I uploaded your schematic file.? It is "RF_Filter_Chebyshev.asc" and it is currently in the Temp ( /g/LTspice/files/Temp ) folder, in the group's Files (

Andy, I did so instinctively and THEN read the group webpage. My apologies for the oversight. -- William, k6whp -------------------- "Cheer up, things could get worse. So I cheered up and things got

It's a pretty simple reason, which looks obvious after you realize it. Your signal source has a 1 (volt) amplitude and 50 ohm source impedance.? It is a Thevenin source, so you've got 1 volt behind

Even better:? Why not read the group's guidelines on the main group webpage. You attempted to paste your schematic file into the message.? Never paste or attach any files into a group message. Andy

Am designing a low pass filter for the 20m amateur band, code below. (My apologies if this violates group protocol. Advise and I will adhere in the future.) I note that the display shows this model to

Simply use six instances of your circuit on single page and modify connection\termination for each individual circuits. Yes, it`s not elegant, but works as simple as hammer. Not sure if some kind of

I consider that an odd thing to say. On the one hand, it suggests that his program adds pre-programmed delays which can't be reduced further, without risk of failure. On the other hand, it suggests

Filename is "ptc_sh.zip". It is currently in the Temp ( /g/LTspice/files/Temp ) folder at the group's website. Andy

Yes Andy. Exactly.