Editing Semiconductor Analyzer Review
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== Building == | == Building == | ||
− | This is pretty straightforward, stuff | + | This is pretty straightforward, stuff an solder. I followed the directions anyway, except I added extra sockets for the 74HC4052 Dual 4-channel analog multiplexers. Then I double checked the parts. The resistor color codes are difficult to distinguish ( not their fault, this is an industry standard ) so I used a magnifier and double checked with a ohmmeter. No mistakes found. The one place I had difficulty was soldering the header onto the LCD display. It acted as if there were some coating on the LCD which repelled the solder. It was too late to clean up the pins. The solder may have been good down in the hole. I skipped cleaning up the flux. Powered up without the CPU ( according to directions ) and measured some voltages, so far so good. |
Next I inserted the CPU and powered up again. LCD should light and display. It did neither. Twisting the contrast control for the LCD gave me a line of blocks, but that was it. | Next I inserted the CPU and powered up again. LCD should light and display. It did neither. Twisting the contrast control for the LCD gave me a line of blocks, but that was it. |