Pye 'Fenman 1' magic eye puzzler

[Joe]

If all else fails you could muck about with this idea:

https://www.youtube.com/watch?v=QFTDOZz-LlE

Lawrence.

I must confess to having ideas involving barograph drivers and LEDs myself.

Thankfully most of my radios don't have them. I can hear when they are tuned in properly and they just strike me as a needless complication waiting to go wrong.

- Joe