Author Topic: Vacuum Fluorescent Display Driver  (Read 46110 times)

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Offline pqass

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Re: Vacuum Fluorescent Display Driver
« Reply #175 on: January 07, 2025, 06:50:37 pm »
Page 53 on the schematics show things like VFDSCLK, but the label changes to BVFDSCLK. On the front panel schematic it's shown again as VFDSCLK.

I've soldered the wires to the three pins (12, 16, and 18), but wanted to verify this is correct. Normally the "B" would indicate a different node, but I'm guessing this was done because they go through the series current limiting resistors and the two nodes can't have the same name.

It's just odd they revert to removing the "B" when it goes to the front panel board.

This should be fine.
I don't think you'll have an issue driving the extra inputs of the 1488 through the 1K resistors.
Schematics don't always make sense; can be contradictory.
 

Offline bostonmanTopic starter

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Re: Vacuum Fluorescent Display Driver
« Reply #176 on: January 08, 2025, 12:17:55 am »
Thanks.

Seemed odd to rename the node names, but, as you stated, schematics don't always make sense.

I agree and assumed the 1k resistors (1.92k on VFDSEN) won't affect anything. Just wanted to confirm I wasn't overlooking the nodes going elsewhere.

 

Offline bostonmanTopic starter

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Re: Vacuum Fluorescent Display Driver
« Reply #177 on: January 24, 2025, 03:17:36 am »
I began building the external display circuits on a perf board, however, I got annoyed at trying to run all the jumpers, so I made a PCB.

Attached is the schematic. It began as a simple circuit, but I didn't want to make two separate boards, and put everything on one board with the idea I'll only populate what is needed for each board.

Unfortunately I didn't create a good schematic because I used too many ports. I should have placed the connections next to the IC rather than separate the circuits with ports. Also, my pet peeve is placing too many circuits on a single page, and I did just that.

I'm uncertain whether I'll use all the "features" I placed on the board, but thought have LEDs would be cool, connectors for future troubleshooting, and a regulator should I need one rather than use the one on the Arduino.
 


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