TI-45: Rejuvenation of a faded VFD-Display

[Massimo Gnerucci]

(06-06-2021 07:45 PM)toml_12953 Wrote:  

(06-06-2021 05:56 PM)Steve Simpkin Wrote:  Very interesting! Somewhat similar to the principle of a TV picture tube rejuvenator.

There were a handful of TI handheld calculator models that used a VFD. I know at least the TI-1025, TI-1265 and TI-1650 four-function models used a VFD. I was surprised to learn that the power consumption was less than an LED model. I would have thought that the high voltage power supply needed to drive the anodes alone would consume more power than an LED model. Thank you providing the data to confirm the lower power used by this model. For many years VFDs were also cheaper than LEDs as well.

The above TI models appear to use a capacitor voltage multiplier instead of a transformer to achieve the required anode voltage.

There was even a TI with a Panaplex display (TI-150)!

http://www.datamath.org/BASIC/DATAMATH/J...tm#display

Not to mention my preferred one, the SR-22!