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Archive for June, 2011

VGA signal converter for Tektronix 308 Data Analyzer

June 29, 2011 Leave a comment

Memo

I got a Tektronix 308 Data Analyzer from taobao some time ago during the period I was fond of playing old electronics devices. Well, this creature was born almost in the same year as I was. Everything works well except that it did not come to me with signal input accessories. Since there is maintenance manual available, not much reverse effort is required to DIY its data acquisition connectors. The connectors seem to be privately made and cannot be found now by its part number. But I can directly hook the pins from PCB board. When I opened its box, I noticed that there are only 4 wires to the CRT module. Interestingly I watched the signals on OSC and found that it’s something like VGA signal and I started to study details related to VGA.

It’s a FPGA work and here goes some quick photos.

LCD and Tektronix 308

Tektronix 308: 224×200 at pixel clock 4.6666Mhz

LCD RGB: 320×240 at pixel clock 12.5Mhz

VESA: 640×480 at 75Hz vertical frequency

Technical Notes

  • Design Presentation (In Progress)
  • Source Code (TODO)
  • Design Notes (TODO)
    • Digital signal sampling (Tek308VgaSignal)
    • Multiplexer for reading RAM with a single read port (ReadRamMux)
Categories: DIY

Opening Note

Some time ago, I came across a web site of an electronics enthusiast, http://elm-chan.org/. I did even follow his techniques of crazy wiring directly on legs of ICs with enameled wires. I tried this on a couples of ICs. Although I gave up later and switched back to homebrew PCB. The passion and fun of Chan’s works inspired me greatly…

Well, to show my passion, here goes some examples of directly soldering ICs in TQFP and QFN package. I even tried BGA with 256 legs and gave up finally due to too many wires.

  

Note that I got back to this, single side PCB prototype board whose via’s are connected by enameled wires and pins are labeled on PCB.

发现英文总是冷冰冰的,总是不由自主地让我倾向于准确罗嗦地描述一件事情,显得呆板而缺乏生气。何必费时地纠结于描述的准确呢,久了还影响积极性,不如想用什么就什么。

这个博客就用来记录一个Geek的足迹,模仿Chan的风格。MSN Spaces当它在的时候倒很久懒得去更新,想写点东西却已经去得无影无踪。老早写的博客还有些能在豆瓣上找到。旧的不去,新的不来啊。最近开始的,另外一个关于生活的,关于厨房和旅行的博客,Cook’s Life Lab,哈哈。希望厌倦的那一天晚点到来吧。

Categories: Notes