[sdiy] [diy] Simulating circuits in SPICE

[Happy Harry]

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.

H^) harry


>From: zyx at yubc.net
>Reply-To: zyx at yubc.net
>To: Synth DIY <synth-diy at node12b53.a2000.nl>
>Subject: [sdiy] [diy] Simulating circuits in SPICE
>Date: Tue, 06 Feb 2001 13:11:00 +0100
>
>Hi everybody,
>I'm trying to build the VCO from ASM-1,
>and I'm wondering if anybody has experience in
>simulating this circuit in SPICE because
>I just can't get the thing to oscilate.
>The problem is somewhere in CA3140/LM311 part.
>The LM311 has a pin (Ground) that (from PCB picture)
>seems to be connected to -15V. Is it absolutely
>necessary to use CA3140 model in SPICE? Or
>could it be that SPICE somehow doesn't handle
>this type of feedbacks. Thank you in advance,
>
>						Bojan Petrovic
>						zyx at yubc.net
>
>

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