I'd love to be able to buy or make 3 digit MHZ displays. I've seen pictures of cases with 3 digit mhz displays but I've never seen one IRL.

Check out this thread: Fabricating a New Turbo Display

I'm not sure if it is only 2 digits, but might be good for inspiration ..

Using 74LS47 jelly beans (in SMD packages if you're concerned about size) is a nice solution to lower the logic pin count and provide driver electronics in one chip. Use 74x48s if you have common cathode LEDs to go with it and you can dispense with the resistor packs. Common cathode also allows CD4511 drivers. These have latching inputs to multiplex your data lines. That would require only one extra line plus one line per digit (instead of four per digit normally) potentially allowing the use of a smaller (and cheaper microcontroller).

In most cases, we're talking <1 USD per chip. Might be worth it?

I'm definitely interested, My thread on the topic: Replacement AT Case turbo display

I find it hard to believe these aren't manufactured. I'd be happy with a drive bay seven segment display that you simply pre-set and the only connection it needs would be power. I've looked to see if i can find them with each number wired to a dipswitch array but it seems every project using seven segment displays also uses an arduino.

@peg - That's the same display as mine!

I'm looking to stick with the original design of this board without having to invest time in programming and utilizing a microcontroller, or optimizing tracework. I know it's a pain to configure jumpers, but to me this would be a much simpler approach, and I'd rather just keep this as simple as possible.

Now unfortunately I don't know what the original part number was for the 2.5-digit (1xx) display as there are no markings. I was however fortunate to find a two-digit display (part# TOD-4201BMRL-B) I harvested from some type of interface a while ago that shares the exact same dimensions, including pin count, length, and size; the exception being the digits were slightly larger and are red rather than green. This is a really good score because there is an available datasheet on the TOD-4201BMRL part that has all the dimensions worked out.

All that's left for me to do is finish the schematics for the top layer, and determine if the original segment display was common anode, or common cathode.

I've attached some pictures for comparison between the two modules. On the left is the original 2.5-digit (green) display, and on the right the display from my parts bin.

Some dual lane 0.1" strip, two large value low power resistors for pull up/pull down, one resistor for LED indicator current limit, one pnp bjt, one npn bjt, two eight pin resistor packs.

Just hoping that I'll get to pull myself together to build one with these some day 🤣

What about a smaller three-digit module behind a rectangular piece of dark red or dark green acrylic?
That way one could match the cutout in the case and still use a readily available display module.

H3nrik V! wrote on 2020-04-09, 15:49:

Just hoping that I'll get to pull myself together to build one with these some day 🤣

For an Intel Skulltrail case, I presume?

never thought this coud be possible to recreate.
i got a display that besides having 2 digits in one color. it has the words MHZ in red, i have never seen displays with words, only numbers so far and was shocked when i saw it on the case.

one of the sticks in "MHZ" is failing tho, has lower dim., after 30min of use the light kind of looks ok. perhaps we should just print something in 3d printer and just light up a led on the back.

SETBLASTER wrote on 2020-04-10, 03:09:

never thought this coud be possible to recreate.
i got a display that besides having 2 digits in one color. it has the words MHZ in red, i have never seen displays with words, only numbers so far and was shocked when i saw it on the case.

one of the sticks in "MHZ" is failing tho, has lower dim., after 30min of use the light kind of looks ok. perhaps we should just print something in 3d printer and just light up a led on the back.

... Or you could just use a 2D printer:

1. Create a custom PCB for the desired LED layout
2. Populate it with LEDs
3. Print a mirror image of the inverted (i.e. white on black) layout on thin paper
4. Put it behind acrylic with the printed side facing the LEDs

SETBLASTER wrote on 2020-04-10, 03:09:

never thought this coud be possible to recreate.
i got a display that besides having 2 digits in one color. it has the words MHZ in red, i have never seen displays with words, only numbers so far and was shocked when i saw it on the case.

just look for an alphanumeric LED to display letters, you can still buy those new, might be difficult to find one that fits exactly though.

gdjacobs wrote on 2020-04-09, 23:50:

H3nrik V! wrote on 2020-04-09, 15:49:

Just hoping that I'll get to pull myself together to build one with these some day 🤣

For an Intel Skulltrail case, I presume?

Haven't measured, but probably just in a 5.25" bezel if it fits ..

H3nrik V! wrote on 2020-04-10, 13:54:

Haven't measured, but probably just in a 5.25" bezel if it fits ..

How mundane. I'll let you know if I see a spare Jumbotron around.

Brickpad wrote on 2020-04-08, 02:52:

@peg - That's the same display as mine!

I'm looking to stick with the original design of this board without having to invest time in programming and utilizing a microcontroller

I second this. Not everybody has the gear and knowledge to program a microelectronic, and price is a factor as well. The simpler and cheaper the better. The only change I would make is replacing the jumper bock with dip switches.