Hardware design cost savings experience notes

Hardware design cost savings experience notes

1, these pull the high pull low resistance with the big resistance relationship is not small, choose an integer 5K bar

There is no 5K resistance on the market, the closest is 4.99K (accuracy 1%), followed by 5.1K (accuracy 5%), its cost is 20% higher than the accuracy of 4.7K 4 times times and twice times. 20% the resistance value of the precision is only 1, 1.5, 2.2, 3.3, 4.7, 6.8 several categories (including an integer multiple of 10); Similarly, 20% of the accuracy of the capacitance is only the above several values, if you choose the other values must use higher precision, the cost is doubled, but does not bring any benefits.

2 . What color does the light on the panel choose? I think Blue is more special, just choose it.

Other colors such as red, green and yellow, regardless of size (5MM or less) package, have matured for decades, the price is generally under 5 cents, and the blue is almost three or four years to invent things, technical maturity and supply stability is poor, the price is four or five times times more expensive. At present, the blue light is only used in cases where no other color can be substituted, such as displaying video signals.

3, this logic with 74XX of the gate circuit to ride, but too soil, or use CPLD bar, appear high-grade more

74XX door CIRCUIT only a few cents, and the CPLD at least dozens of yuan, (Galpal although only a few dollars, but the company is not recommended). Increase the cost of n times not to say, to production, documentation and other work to add several times.

4, our system requirements are so high, including Mem, CPU, FPGA and so on all the chips to choose the fastest

Not every part of a high-speed system works in a high-speed state, and the device speed increases by one level, the price is almost doubled, and the signal integrity problem has a great negative impact.

5, the board of the PCB design requirements are not high, with a fine line, automatic cloth bar

Automatic wiring is bound to occupy a larger PCB area, at the same time more than the manual wiring more than many times the hole, in the bulk of the product, the PCB manufacturers to consider the factors in addition to business factors, is the line width and the number of holes, they affect the yield of the PCB and the amount of bit consumption, saving the cost of suppliers, Also found a reason for the price reduction.

6, the program as long as stability can be, the code is a little longer, less efficient is not the key

CPU speed and memory space are bought by money, if writing code more than a few days to improve the efficiency of the program, then reduce the CPU frequency and reduce memory capacity of the cost savings is absolutely cost-effective. CPLD, FPGA design is similar.

^_^ Bruce Lone

2015-9-10

Hardware design cost savings experience notes