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Thank you for the instruction for the K factor. If I have time left, I will try to handle the problem with the transistors. If it works, I will give you a feedback. But I think it is impossible for a

If adding the inductor there made a difference, then I think you are on the right track. It probably means the first transistor is now oscillating. Can you see the oscillation on that transistor,

Good question! Could be either or both. This oscillator circuit looks "funny" to me because it lacks an explicit positive feedback path, so I'm guessing it makes use of characteristics internal to the

> For the most part you need to add little inductors in series with each > component. There is no parameter or something similar that adds an > inductance everywhere. > > Capacitors in LTspice do have

Do you think I used the wrong models or the setup of my circuit is wrong? No they are not. I thought if it is a coil with tap I can separate it without using this. On the first hand I don't know how

For the most part you need to add little inductors in series with each component. There is no parameter or something similar that adds an inductance everywhere. Capacitors in LTspice do have an

Okay, thank you. I am absolutely confused how to handle this problem. :) The best way to find an answer is to ask my professor what he wants. He gave me this circuit and said: as a training you have

Something is wrong with that. The frequency should depend on the capacitance at that node (top of BB105 to ground). If it doesn't, then the oscillator transistor (the one on the left) isn't

Hi, the theory is evident. I didn't reflect on the difference between the simulation and the original specification of the frequency in my image. I thought of the ideal characteristics of the

Yes, the standard "it's not what is on the schematic that you should be concerned about, it's what is not on the schematic" problem. -- Scanned by iCritical.

Or you can model it as a length of transmission line. Below a quarter-wavelength long, it will behave as an inductance, exactly like the real wire does. The thing I don't see specified on the

Hello, Every component has a two or more leads. Even if you make it as short as possible, you will always have more than 1nH on every lead. Also one shouldn't forget the capacitance of every device to

Thank you for the advice. I will try this first and find out, how to manage the seperate inductions afterwards.

@Helmut: I'm not sure how to allocate the inductions to the seperate pins. But I will find out how to manage it. @andy:If I change the details on the bb105 diode it does not change the frequency at

In message <kt5rjr+q9qr@...>, dated Mon, 29 Jul 2013, Helmut <helmutsennewald@...> writes: Specifically, that silver wire is an *inductor* and needs to be modelled as such. You can find

I think the frequency is determined by the first stage, with the BB105 and the 25 mm long wire. The coil L is in the second stage which is an RF amplifier and shouldn't change the frequency (or am I

Thank you. I used the BFR92 as the BFR92 already. My problem is the BB105 which is not available anymore. The point with the silvered copper seems reasonable. I searched the ECM in english and the

Hello Christian, You forgot the many x*nH inductance of every component-pin. Best regards, Helmut

Thank you. The model is a good approach for the original device. As I mentioned before, I used a V-source as the ECM and connected the output with the negative cable. I also think that silver wire and

Hello CV, Original reference uses BFR92 which is plenty good enough for this gadget. Per result of 45 sec search, look in Philips catalogs: