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## Create and study BOM, powerlist and netlist
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## Create and study BOM, powerlist and netlist
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1. **Use as few different components as possible**.
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1. Use as few different components as possible
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- A single BOM line is costing roughly 100-200 CHF (ordering,
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- A single BOM line is costing roughly 100-200 CHF (ordering,
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putting roll on machine etc.) and you will save time for
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putting roll on machine etc.) and you will save time for
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yourself
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yourself
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(checking BOM, ordering) and will also have less chances of
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(checking BOM, ordering) and will also have less chances of
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mounting the wrong components.
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mounting the wrong components.
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- **Print the BOM**, check the resistor values used and see if you
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- Print the BOM, check the resistor values used and see if you can
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can remove some values by putting them in parallel or series (or
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remove some values by putting them in parallel or series (or
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actually taking existing values that are as good).
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actually taking existing values that are as good).
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The same for capacitors (cf.
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The same for capacitors (cf.
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[SVEC](https://www.ohwr.org/project/svec/wiki): 9 C-types, 16
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[SVEC](https://www.ohwr.org/project/svec/wiki): 9 C-types, 16
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mounted.
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mounted.
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- See if potentiometers in the final design can be replaced by a
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- See if potentiometers in the final design can be replaced by a
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fixed value resistor (reduces production and calibration costs).
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fixed value resistor (reduces production and calibration costs).
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2. Print out the **power and ground list** for all ICs and check if
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2. Print out the power and ground list for all ICs and check if they’re
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they’re correctly connected.
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correctly connected.
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3. Print out the **netlist**, sort alphabetically and check for any
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3. Print out the netlist, sort alphabetically and check for any
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inconsistencies (in naming, bus signals all used).
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inconsistencies (in naming, bus signals all used).
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This takes some time, but really can show non-obvious mistakes.
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This takes some time, but really can show non-obvious mistakes.
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4. For any newly created symbols, check the pin numbering.
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4. For any newly created symbols, check the pin numbering.
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... | @@ -138,5 +138,5 @@ |
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-----
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-----
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Erik van der Bij - 28 February 2018
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Erik van der Bij - 1 March 2018
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