[sdiy] [diy] Simulating circuits in SPICE

[zyx at yubc.net]

I have managed to get it to oscillate. It just needed a .IC 
(initial condition) of 0 V on the timing capacitor.
Thanks anyway.

						Bojan Petrovic


2/8/01 1:40:27 AM, Magnus Danielson <cfmd at swipnet.se> wrote:

>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
>