[sdiy] [diy] Simulating circuits in SPICE

[Magnus Danielson]

From: "Happy Harry" <paia2720 at hotmail.com>
Subject: Re: [sdiy] [diy] Simulating circuits in SPICE
Date: Tue, 06 Feb 2001 14:59:03 -0000

> I have not tried the ASM1, but have modeled lots of others.
> Waych out for models that have embedded power supplies... you
> may want -15V and it may insist on ground.
> 
> Try Kick starting it. I use EWB and put a spst swtich across the
> timing cap. By closing the switch I can prove how everything works.
> I'll look at the ASM1 and see if I can model it.

The ASM1 oscillator should just kickstart as it is.

The CA3140 could be replaced with basically any suitable JFET op-amp
so any normal opamp with a model around could be used. Heck, usa a
TL081 model or something. It should work OK in the simulation.

At the least you should get a rising ramp until it reaches the power
supply line.

I haven't simulated it myself... it is even a long time ago I even
tried to do it so I don't even know if I have a working Spice around.

Cheers,
Magnus