Collaborate Disseminate
The classic “Magic Eye” tuning indicator was a fantastic piece of vacuum tube technology that graced all kinds of electronic gear for a fair fraction of the 20th century. But …read more Continue reading The Eyes Have It with This Solid State Magic Eye
LEDs weren’t always an easy solution to displays and indicators. The fine folks at [Industrial Alchemy] shared pictures of a device that shows what kind of effort and cost went into making a high brightness bar graph display in the 70s, back when LEDs were both expensive and not particularly bright. There are no strange materials or methods involved in making the display daylight-readable, but it’s a peek at how solving problems we take for granted today sometimes took a lot of expense and effort.
The display is a row of 28 small incandescent bulbs, mounted in a PCB and …read more
Continue reading A Daylight-Readable Bar Graph Display in the 70s Wasn’t Cheap