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From: Cursitor Doom <cd999666@notformail.com>
Newsgroups: sci.electronics.design
Subject: Re: Oscillators in LTspice
Date: Fri, 18 Oct 2024 16:56:09 -0000 (UTC)
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On Fri, 18 Oct 2024 12:38:42 -0400, bitrex wrote:

> On 10/18/2024 12:33 PM, Cursitor Doom wrote:
>> Gentlemen,
>> 
>> I've never spiced an oscillator AFAICR. Do they self-start in spice
>> simulators (LT in particular)? IOW, did Mike Engleheart build something
>> into the engine which generates wideband 'background' noise,
>> particularly at 'power up' as it were? I'm assuming there must be some
>> such mechanism and if there is, it must be present by default for all
>> schematics one attempts to simulate and not just oscillators?
> 
> They can be a PITA to start in LTSpice, like this old chestnut really
> doesn't want to run at all IME in LT but is fine on a breadboard:
> 
> <https://upload.wikimedia.org/wikipedia/en/thumb/8/83/
Forrest_Mims_hand_drawn_circuit_1983.jpg/220px-
Forrest_Mims_hand_drawn_circuit_1983.jpg>

That's basically an RC multivibrator isn't it? As such there's no reason 
why it shouldn't function in any flavour of Spice in addition to real 
life. My question was more in relation to the simulation of LC 
oscillators.