I'm making a LED-based replacement display module for a couple of my Fluke bench meters. The VFDs in these get dimmer over time.
The replacement consists of a PCB, a plastic baffle with cut-outs where there are lit segments, translucent material of some sort in the cut-outs to diffuse the light, and a printed sheet with words all laminated together.
There is a trimmer on the board to adjust the brightness.
I may also add the ability to have a continuity buzzer, but I can't find a good place to put a switch to turn that feature on and off.
On the 8840A the unused button position where the AUTO switch is on the 8842A might be usable but there aren't good front panel choices on the 8842A because of the metal plate.
Maybe it would be usable to always have the continuity buzzer enabled; I don't know.
If enough people are interested, I could make these available for purchase (assuming I get good results from my prototypes).
What would be a reasonable price to ask?
Are any of you interested?
I'll be getting a batch of 10 from JLC PCB in a couple of weeks, and will have to hand-solder the missing components including the 64-pin QFP processor that is doing the level shifting, LED driving, and continuity detection.
Here's the board: