LED display pcb RFT ULP-2
Description
This thing is a remake of a pcb I had purchased 30 years ago. It holds a row of 3 LED displays (with two digits on each of them ) of the VQBxx/VQExx series made by the Berlin(GdR) "Werk fuer Fernsehelektronik". i.e: VQE 11/13 VQE 12/14 VQB 26-28 The files: Update: - LED cover frame (cutout 75x20mm). It fits 3 LED in a row but not the shape of the pcb. The mount screw holes distances are 95x30mm. It has the posts for the screws. Post diameter is 5mm. The stl-file thas been taken from my frequency counter refresh project. The picture shows the first tried out printed piece. The crappy Chinese made Cetus3D did not well, again. It needs sometimes MUCH advise, telling him how to print propperly. The possible reason for failed prints on the Cetus3D: Some popele have guess they are using kind of Marlin Firmware. But the crapp Up!-slicer is spilling out to much commands/comments at the begin of the machine code. This leds to some kind of buffer overflow. In the end it has missing strokes even midprints. No filament printed out on some lines at the bottom and sometimes it misses printing the perimeters midprints. Poeple had seen the same behavior when they had send code made by Simplify3D slicer to regular RepRap printers. The code has a huge amount of comments at the begin. Can be removed safely. But this is impossible with the Up!-slicer. No access. . Strange enough, when printing with No raft the Cetus starts printing the first strokes and then starts stuttering before it resumes printing. You have been warned. Do not trust the slotted eyes (Cheeeese please) poeple. -The Gerber and Exxellon files are intended for milling and drilling the traces and holes on side K1 instead of the underside K2. I have moved the traces from K2 to K1 during designing the layout. - DO NOT mirror the traces for milling, drilling again! -The SVG file can be used for making the pcb using fotografical technics. Mirror the layout according to your need here. For reference see the picture of the old pcb. . The picture shows the 30 years old pcb. This is not the new one I'm making. Data-sheets: For the VQB 26-28 see the pictures, expand the view to full size. . This is not the full lengthy datasheet made by the manufacturer written in short form by Ing. Winfried Müller. He published on the electronics journal "rfe" (Radio Fernsehen Elektronik) 1984, issue 10 starting at page 649. . There were made a few more shortened datasheets based on this publication, i.e. on magazines and some electronics books then. -http://www.elektron-bbs.de/elektronik/tabellen/ddr/vqe.pdf Those LED's are very popular still, at least in Germany and some other european countries. . The LED's used: The LED have channels, guiding the emitted light toward the top surface of the dark green dyed body. The result is a high contrast display, where the light comming from the LED's make a really good distinguishable view of the figures. Unfortunaly those with high efficyency are hard to get these days. But the LED can be refreshed by replacing the tiny small smd led inside. guide: https://www.mikrocontroller.net/topic/284082 Big advantage of those VQB/VQE-LED, the pin-out allows feeding the traces on a pcb easily, making them a signal bus. . Youtuber XRC made a series of instructional videos where he shows the use of 7-segment LED in multiplexed mode connected with the Arduino. But he had wired the signal bus by hand. youtu.be /ekfihh9m8_8?t=165 Puh.
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