Question - what is the internal modelling technique used
by these various programs, and can we produce our own package?

Is it based upon successive delta-time increments, and if so, what
is the increment? What prompted the last question is an attempt
I made to create a sine-wave generator using the identity that
sin dTheta = dTheta, but I had to go for an _extremely_ small
value of dTheta (ISTR 10^ -18) before getting anything like a
decent sine wave, and even that degenerated after a few cycles.

So, these circuit simulators - what is their underlying technique
for circuit simulation?

"Roger Johansson" wrote in message
...
"Reg Edwards" wrote:
Some years back, after retirement, I bought out of curiosity a copy of
Electronics Work Bench. It was and still is the only such program I
have ever had my hands on. I think it arrived on a collection of
floppies.
Multisim has a very bad reputation because is has a lot of bugs.
The best version of EWB is 5.c