Is there something wrong with the spice of CircuitMaker ?

[Abbie]

I am having problems to simulate a well known circuit
(astable) with CircuitMaker. I include the CKT file,
could someone tell me why the simulation does not work ?

Here is the file.

http://wwwwww.users.btopenworld.com/UNTITLED6.CKT


The circuit is from

http://www.davidbridgen.com/astable.htm

Rex

 

[Terry Pinnell]

"Abbie" <AbbieAbbieAbbie@btinternet.com> wrote:

I am having problems to simulate a well known circuit
(astable) with CircuitMaker. I include the CKT file,
could someone tell me why the simulation does not work ?

Here is the file.

http://wwwwww.users.btopenworld.com/UNTITLED6.CKT


The circuit is from

http://www.davidbridgen.com/astable.htm

Rex

I think that circuit, the basic 2-transistor astable, is a challenge
to get convergence using *any* version of Spice.

--
Terry Pinnell
Hobbyist, West Sussex, UK

 

[Kevin Aylward]

Terry Pinnell wrote:

"Abbie" <AbbieAbbieAbbie@btinternet.com> wrote:

I am having problems to simulate a well known circuit
(astable) with CircuitMaker. I include the CKT file,
could someone tell me why the simulation does not work ?

Here is the file.

http://wwwwww.users.btopenworld.com/UNTITLED6.CKT


The circuit is from

http://www.davidbridgen.com/astable.htm

Rex

I think that circuit, the basic 2-transistor astable, is a challenge
to get convergence using *any* version of Spice.

One simply uses a vswitch to force a node at start-up, than disconnects
it after say, 1ns.


Kevin Aylward
salesEXTRACT@anasoft.co.uk
http://www.anasoft.co.uk
SuperSpice, a very affordable Mixed-Mode
Windows Simulator with Schematic Capture,
Waveform Display, FFT's and Filter Design.

http://www.anasoft.co.uk/replicators/index.html

"Understanding" itself requires consciousness,
therefore consciousness cannot be "understood"
without referring to itself for the explanation,
therefore the "hard problem" of consciousness,
is intrinsically unsolvable as it is self referral.

 

[Terry Pinnell]

"Kevin Aylward" <kevindotaylwardEXTRACT@anasoft.co.uk> wrote:

Terry Pinnell wrote:

I think that circuit, the basic 2-transistor astable, is a challenge
to get convergence using *any* version of Spice.

One simply uses a vswitch to force a node at start-up, than disconnects
it after say, 1ns.

Kevin Aylward

Your 'simply' might be Rex's 'challenge'.

I think a slightly simpler approach than yours is possible, as shown
here:

http://www.terrypin.dial.pipex.com/Images/BasicAstable.gif

--
Terry Pinnell
Hobbyist, West Sussex, UK

 

[Kevin Aylward]

Terry Pinnell wrote:

"Kevin Aylward" <kevindotaylwardEXTRACT@anasoft.co.uk> wrote:

Terry Pinnell wrote:

I think that circuit, the basic 2-transistor astable, is a challenge
to get convergence using *any* version of Spice.

One simply uses a vswitch to force a node at start-up, than
disconnects it after say, 1ns.

Kevin Aylward

Your 'simply' might be Rex's 'challenge'.

I think a slightly simpler approach than yours is possible, as shown
here:

http://www.terrypin.dial.pipex.com/Images/BasicAstable.gif

The reason for my suggestion is that it it always works. It makes sure
that there is only *one* solution for spice to converge to.

Kevin Aylward
salesEXTRACT@anasoft.co.uk
http://www.anasoft.co.uk
SuperSpice, a very affordable Mixed-Mode
Windows Simulator with Schematic Capture,
Waveform Display, FFT's and Filter Design.

http://www.anasoft.co.uk/replicators/index.html

"Understanding" itself requires consciousness,
therefore consciousness cannot be "understood"
without referring to itself for the explanation,
therefore the "hard problem" of consciousness,
is intrinsically unsolvable as it is self referral.

 

[Abbie]

"Kevin Aylward" <kevindotaylwardEXTRACT@anasoft.co.uk> wrote in message newswjxb.604$HT2.415@newsfep3-gui.server.ntli.net...

Terry Pinnell wrote:
"Abbie" <AbbieAbbieAbbie@btinternet.com> wrote:

I am having problems to simulate a well known circuit
(astable) with CircuitMaker. I include the CKT file,
could someone tell me why the simulation does not work ?

Here is the file.

http://wwwwww.users.btopenworld.com/UNTITLED6.CKT


The circuit is from

http://www.davidbridgen.com/astable.htm

Rex

I think that circuit, the basic 2-transistor astable, is a challenge
to get convergence using *any* version of Spice.

One simply uses a vswitch to force a node at start-up, than disconnects
it after say, 1ns.

o.k. no problem, how do I do this?

Kevin Aylward
salesEXTRACT@anasoft.co.uk
http://www.anasoft.co.uk
SuperSpice, a very affordable Mixed-Mode
Windows Simulator with Schematic Capture,
Waveform Display, FFT's and Filter Design.

http://www.anasoft.co.uk/replicators/index.html

"Understanding" itself requires consciousness,
therefore consciousness cannot be "understood"
without referring to itself for the explanation,
therefore the "hard problem" of consciousness,
is intrinsically unsolvable as it is self referral.

 

[Kevin Aylward]

Abbie wrote:

"Kevin Aylward" <kevindotaylwardEXTRACT@anasoft.co.uk> wrote in
message newswjxb.604$HT2.415@newsfep3-gui.server.ntli.net...
Terry Pinnell wrote:
"Abbie" <AbbieAbbieAbbie@btinternet.com> wrote:

I am having problems to simulate a well known circuit
(astable) with CircuitMaker. I include the CKT file,
could someone tell me why the simulation does not work ?

Here is the file.

http://wwwwww.users.btopenworld.com/UNTITLED6.CKT


The circuit is from

http://www.davidbridgen.com/astable.htm

Rex

I think that circuit, the basic 2-transistor astable, is a challenge
to get convergence using *any* version of Spice.

One simply uses a vswitch to force a node at start-up, than
disconnects it after say, 1ns.

o.k. no problem, how do I do this?

Place a voltage controlled switch on the schematic. Place a pulse
generator on to the schematic. Wire them up.

Kevin Aylward
salesEXTRACT@anasoft.co.uk
http://www.anasoft.co.uk
SuperSpice, a very affordable Mixed-Mode
Windows Simulator with Schematic Capture,
Waveform Display, FFT's and Filter Design.

http://www.anasoft.co.uk/replicators/index.html

"Understanding" itself requires consciousness,
therefore consciousness cannot be "understood"
without referring to itself for the explanation,
therefore the "hard problem" of consciousness,
is intrinsically unsolvable as it is self referral.

 

[Abbie]

"Kevin Aylward" <kevindotaylwardEXTRACT@anasoft.co.uk> wrote in message news:Bfmxb.748$HT2.440@newsfep3-gui.server.ntli.net...

Terry Pinnell wrote:
"Kevin Aylward" <kevindotaylwardEXTRACT@anasoft.co.uk> wrote:

Terry Pinnell wrote:

I think that circuit, the basic 2-transistor astable, is a challenge
to get convergence using *any* version of Spice.

One simply uses a vswitch to force a node at start-up, than
disconnects it after say, 1ns.

Kevin Aylward

Your 'simply' might be Rex's 'challenge'.

I think a slightly simpler approach than yours is possible, as shown
here:

http://www.terrypin.dial.pipex.com/Images/BasicAstable.gif

The reason for my suggestion is that it it always works. It makes sure
that there is only *one* solution for spice to converge to.

I don't think that CircuitMaker has such a feature though I may be
wrong. Also, the above link is not from CircuitMaker. Anyway,
if you know how to specify an initial node can you please say how
you did it, but if not then I can say that I managed to get it to work.
I simply changed the max-step parameter of the transient analysis
from what it was, 1S to 2S. Don't ask me why but it works with 2S
but not with 1S. Weird.

Kevin Aylward
salesEXTRACT@anasoft.co.uk
http://www.anasoft.co.uk
SuperSpice, a very affordable Mixed-Mode
Windows Simulator with Schematic Capture,
Waveform Display, FFT's and Filter Design.

http://www.anasoft.co.uk/replicators/index.html

"Understanding" itself requires consciousness,
therefore consciousness cannot be "understood"
without referring to itself for the explanation,
therefore the "hard problem" of consciousness,
is intrinsically unsolvable as it is self referral.

 

[Terry Pinnell]

"Abbie" <AbbieAbbieAbbie@btinternet.com> wrote:

"Kevin Aylward" <kevindotaylwardEXTRACT@anasoft.co.uk> wrote in message news:Bfmxb.748$HT2.440@newsfep3-gui.server.ntli.net...
Terry Pinnell wrote:
"Kevin Aylward" <kevindotaylwardEXTRACT@anasoft.co.uk> wrote:

Terry Pinnell wrote:

I think that circuit, the basic 2-transistor astable, is a challenge
to get convergence using *any* version of Spice.

One simply uses a vswitch to force a node at start-up, than
disconnects it after say, 1ns.

Kevin Aylward

Your 'simply' might be Rex's 'challenge'.

I think a slightly simpler approach than yours is possible, as shown
here:

http://www.terrypin.dial.pipex.com/Images/BasicAstable.gif

The reason for my suggestion is that it it always works. It makes sure
that there is only *one* solution for spice to converge to.

I don't think that CircuitMaker has such a feature though I may be
wrong.

Yes, you are, it does.

Also, the above link is not from CircuitMaker.

A LINK from an ECAD program? Or do you mean to say the circuit I
published was not created in CircuitMaker? If so, then you're wrong
about that too.

Anyway,
if you know how to specify an initial node can you please say how
you did it, but if not then I can say that I managed to get it to work.
I simply changed the max-step parameter of the transient analysis
from what it was, 1S to 2S. Don't ask me why but it works with 2S
but not with 1S. Weird.


Kevin Aylward
salesEXTRACT@anasoft.co.uk
http://www.anasoft.co.uk
SuperSpice, a very affordable Mixed-Mode
Windows Simulator with Schematic Capture,
Waveform Display, FFT's and Filter Design.

http://www.anasoft.co.uk/replicators/index.html

"Understanding" itself requires consciousness,
therefore consciousness cannot be "understood"
without referring to itself for the explanation,
therefore the "hard problem" of consciousness,
is intrinsically unsolvable as it is self referral.

Hey, Kevin - you trying to outdo Jim Thompson's signal-to-sig ratio?

--
Terry Pinnell
Hobbyist, West Sussex, UK