Re: Oscillators in LTspice

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.