[Ktechlab-devel] Simulating an amplifier.

[Dan Andersson]

Lawrence,

Sorry but I didn't really want to push him away...

However,

I do these type of simulations frequently and the tapped mutual inductors are 
a debacle. I can type up a tube allright with some tweaking but I have almost 
always problems with the inductors and rf transformers. Also, smart baluns 
are an interesting simulation problem too.
There is probably many other improvements we whish to see in ktechlab but I 
guess that the tapped inductors will be a hard nut to crack.


Cheers

Dan   /  M0DFI


On Wednesday 14 June 2006 13:40, Lawrence Shafer wrote:
> Dan,
> No, He wants to help us! Don't send someone off when they are willing to
> help! Make this sim support tapped mutual inductors.
>
> Alan,
> You need to set the breakdown voltage for your diode, I think the
> default is 4.7V. The default really should be 100V or something like
> that. It took me a long time to figure this out.
>
> Dan Andersson wrote:
> > Alan,
> >
> > First, I assume you run Linux, if not - eeek! good luck.
> >
> > You most probably need a more "complete" or "extensive" simulator than
> > ktechlab for this! No offense to ktechlab but use Spice3 or NGSpice.
> >
> > Look for the simulators where you can define tapped mutual inductors.
> >
> >
> > Dan / M0DFI
> >
> > On Wednesday 14 June 2006 01:43, Alan Grimes wrote:
> >> Hello, I'd like to simulate an amplifier before buying many many
> >> expen$ive components.
> >>
> >> Naturally such a simulation will need to take into account many of the
> >> parasitic properties of the components such as grid-plate capacitance,
> >> or, for capacitors, ESR and ESL.
> >>
> >> I'm going to need a transformer component too, actually the ability to
> >> specify arbitrary transformers...
> >>
> >> As an initial experament, I was trying to hack together a rectifier and
> >> came across these problems:
> >>
> >> 1. To try to simulate a center tapped transformer, I tried to use a pair
> >> of voltage sources, that didn't work because there was no way to specify
> >> that the outputs on the two ends should be precisely out of phase.
> >>
> >> 2. I now have it running with one generator at 1hz, and I'm looking at
> >> my rectifyer diode, it is showing both positive and negative voltage
> >> swings on both sides! Very very wrong.
> >>
> >> 3. I put an ammeter and a load in the cirtuit, the left side of the
> >> ammeter is showing the correct voltage, however the right hand side is
> >> still pretending as if I still had the thing set at 60 hz!!! =(
> >>
> >> 4. I want to snub the rectifier with a 0.1 ufd capacitor but the sim
> >> crashes, as was previously discussed...
> >>
> >> The smallest capacitor in the design I'm working on is .33 pf. =P
> >>
> >> To model an amplifier, I'm going to need parts for the basic common tube
> >> types, (triode and pentode). For generality, it'd probably be best to
> >> allow the user to enter custom values.
> >>
> >> Popular triodes include: 300B, 2A3, 45, 71A, 845
> >> Popular pentodes include: KT88, 6550.
> >>
> >> (The tube I'm working with includes both a triode and a pentode, 6GV8 )
> >>
> >> I am a skilled programmer so I'd like to contribute as much of the new
> >> functionality as I can.
> >
> > _______________________________________________
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> > Ktechlab-devel at lists.sourceforge.net
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>
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