Free Micro-Cap Simulation

[peter scott]

Well, given that it didn't even get my oscillator to run I decided to uninstall Micro-cap simulation and learn a bit more about LTSpice. Thanks to Cathovisor helping me over the first hurdles.

I'm not totally sure of my ground here but the AC analysis is not selective and the actual output of my real frequency changer does still have Channel 3 (56.75 MHz) larger than Channel 1 (45 MHz) by about 6dB. The spectrum analyser picture is taking CH 3 from an Aurora and includes the sound carrier.

   

So I thought I would look into running an FFT on the unselective output of the LTSpice simulation. I have plotted it on a linear frequency axis. I only have the vision carriers in the simulation.

   

Although the relative amplitudes a bit different I think the simulation is beginning to look quite attractive.

Peter

[peter scott]

I found that in my real circuit I was using 3.65v rather than 5v for the positive rail and I also added a little more capacitance to the oscillator to bring the output to 45MHz.

Peter

   

[Nick]

There's a really helpful Official LTspice forum at https://groups.io/g/LTspice

The LT/ADI developers and support staff hang out there and are very good at responding quickly.

[peter scott]

Thanks Nick, Micro-cap looked easier to use but LTSpice actually works!

Peter

[Mike Watterson]

LTspice is good and there are valve libraries too. Though it's ADI now.
The last LTspice I downloaded didn't work on XP, needed Win7 or higher, though amazingly it's fine on WINE (no VM needed) on Linux. My old XP models worked.
I've downloaded it anyway, though I've pretty much given up Electronics in favour of writing. Maybe I'll change my mind in the summer.

LTspiceXVII is for Windows 7,8 & 10 - you need the previous version, LTspiceIV for XP (and it's now marked End-of-Life) - see https://www.analog.com/en/design-center/...ator.html#

I use the win7 version on WINE on Linux Mint. I don't normally use XP at all. I haven't used XP for LT Spice or CAD/CAE for about four years. I used LTspice for very many years.

Why should being part of ADI be an issue?

I was only pointing out that LT is gone. It's ADI. I know 3 people that work in ADI. Two in the ADI location 6 km from me.