On Sunday, July 29, 2018 at 6:51:39 AM UTC-7, wrote:
I liked the subtle ticking noise of ye olde RICO VACS vario I had in the HP-14. And it was very good at pointing out weak lift. Alas that relic from the 1970s stopped working some time circa 2000. I sent it to its maker and he fixed it, but it later failed again, as has another unit I scrounged somewhere. So I have two of those sitting on the shelf. I'd love to get the schematic and try and revive it. Or build an equivalent audio-only unit. Is it possible to get the schematic diagram somewhere?

I do not know why the RICO clicks did not become the standard for audio. It is the least intrusive sound while better conferring thermal strength, or weakness. It also did not solicit an emotional response to the down tones. I had one vario that the sink tone would make me depressed.