MHz Display Blaster: A 7-segment frequency display clone 

There are two kinds of green LEDs, yellow-green and pure green. The latter is newer technology, it's much brighter, but it lights in a different shade of green. For the authetic look, the older style yellow-green LED display should be used.

Always amazing and useful stuff.

I was waiting for someone to design these. Because I don't like the fixed HI/LO displays of some later AT cases ;-)

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Back in the day I threw out the MHz display and installed the display of a post code card. That made more sense to me. ;)

Thanks! That's useful. I'd like to build a couple of these!

It would be cool if this module give something extra beyond classic Mhz numbers. Maybe POST codes or temperature.

Excellent work 👌.would be nice with a full 3 digit one as well or a 2 + a half digit one. Rebuilding my original first PC from late -94 (Baby AT) myself, and the display had been removed over the years, also the motherboard with plate. But i have managed to find the parts i need although with a slight update then from a AMD 486DX-66 to a AMD K5 PR133 100 MHZ (Pentium) system with 32 MB ram, Cache module, PCI graphics, Sound Blaster AWE 32 etc. Although the display that i took from a donor case is not the same as the original that had two full digits + a half digit, it has 3 full digits that are controlled by a chip and also has a LR41 battery onboard, i guess for keeping settings in memory. Took me a while to figure it out and finding documentation of these kinds of displays, seems they are controlled and set via the reset button and turbo switch. I will have to modify the opening in my case slightly for it to fit also. Really nice to have new ones created and available.

I have a vintage case with a different MHz display, I wonder if I should clone it as well. Though this display is more straightforward than the one in my case (I have one that uses a bunch of ICs, but it supports turbo and non-turbo numbers). Great project to fix those cases with missing and broken displays!

Why did this go away? The system bus speed of computers can be put on display.

A fun thing I've seen done back in the day is you set the normal and turbo "speeds" to complementary "patterns," for example set normal speed to just two dashes (- -) and turbo to be just the upper and lower (= =) and then connect the turbo "switch" to the HDD LED header on the motherboard. Silly yes, but though it was a cool thing they did, kinda a poor man's VU meter for HDD activity =)

Good video, thanks for showing us mistakes and all! Does this design work with the turbo button being depressed to show the alternative speed too?

Hi. Awesome video! Were i can buy this components to create this mhz display? I need for create 2 or 3 display. Also in 3 digit number. Thanks

Has anyone found a 188 led version with this pin configuration?

Hi im not tech guy..but i need to build my p1 pc..and i want to put this mhz display on my tower...did you sell it? If yes i want to buy it.thanks

Very cool.

I tought the size of those displays were kind of a "standard" but the specs of the LTD-6440G are 2,5mm x 2mm. My two displays are 2mm x 1,5mm. Can you confirm the display size ? thankyou

Nice! I was thinking about doing this myself but seems you got the same idea. Another idea I have is creating one for my modern pc with maybe 4 digits so it can display something like 2400mhz hehe.

an actual frequency counter would have been cooler

Yeah, this is the brain dead version that relies on jumpers to set each segment. You could have used a small 50 cent microcontroller and a couple push buttons to set any value by pressing the buttons and storing the value in the microcontroller's eprom memory. Would also help to have resistors for each segment (ex 2 independent resistor arrays with 8 resistors each) to limit the current, so that each segment lights equally bright.

Hello, do you have an discord because im building my sleeper pc and i want this one to word but im struggling bc im not good at tech stuff

That's great , now make a board without jumpers but with two buttons one that increases the value by one and one that resets the display back to 00 . οοοor one button that has in memory all the standard values . :)