Why do you always have higher hardware costs than others? Be wary of these 6 traps.
Q:It doesn’t matter much what resistance value you use for these pull-up/pull-down resistors, just pick an integer 5K!
A: There is no 5K resistance value in the market, the closest is 4.99K (precision 1%), followed by 5.1K (precision 5%), its cost is 4 times and 2 times higher than the precision of 20% of the 4.7K respectively. 20% precision resistor resistance value is only 1,1.5,2.2,3.3,4.7,6.8 a few categories (including 10 integer multiples); similarly, 20% accuracy of the capacitors are also Similarly, the capacitors with 20% precision have only the above values. If you choose other values, you have to use higher precision, which doubles the cost several times, but does not bring any benefits.
Q:What colour should I choose for the indicator light on the panel? I think blue is more special, let’s choose it!
A: Other red, green, yellow, orange and other colours, regardless of the size (5MM or less) package how, have been mature for decades, the price is generally below 50 cents, while the blue was invented in the last three or four years, technical maturity and stability of supply are poor, the price is four or five times more expensive. Currently the blue indicator is only used in the occasions that can not be replaced by other colours, such as displaying video signals and so on.
Q: The logic of this point with the 74XX gate circuit ride can also be, but it is too earthy, or use CPLD, it seems much more upscale.
A:: 74XX gate circuit is only a few cents, and CPLD at least a few dozen dollars, (GAL/PAL although only a few dollars, but the company does not recommend using). N times the cost not to mention, but also to production, documentation and other work to add several times the work.
Q:Our system requirements are so high, including MEM, CPU, FPGA and all the chips to choose the fastest?
A:: In a high-speed system is not every part of the work in the high-speed state, and device speed every increase in a level, the price is almost doubled, in addition to the signal integrity issues brought about by the great negative impact.
Q:The PCB design requirements of this board is not high, just use a thin wire, automatic wiring it!
A: Automatic wiring is bound to take up a larger PCB area, while generating more than manual wiring many times over the hole in the batch of very large products, PCB manufacturers to reduce the price of the factors taken into account in addition to business factors, is the width of the line and the number of holes, which affects the rate of completion of the PCB and the number of drills consumed, respectively, to save the supplier’s costs, but also to find a reason to reduce the price.
Q:Programs as long as the stability is fine, the code is longer, less efficient is not the key!
A: CPU speed and memory space are bought with money, if you write the code to spend a few more days to improve the efficiency of the programme, then from the reduction of CPU frequency and reduce the cost of memory capacity savings is absolutely cost-effective. CPLD/FPGA design is similar.
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