Dual resistor design

Hi Shalen,

John's solution with extension of THT pads to accomodate SMD component too is very uncomfortable, especially with a lot of "doubled" components on a board and I mean only possible for hand made boards, it means without soldering mask, paste, glue and usage of SMT automat.

Jorge give you an idea how to do it easily, it means put into a schematic all resistors doubled (SMD and THT) and then put them both ideally sharing the same place on the board. This solution has one problem: you must do everything two times (schematic, values and may be names too and then placement on board and connection of pads).

More complicated on start, but more comfortable on a usage is my way: make your own library component as SMD and THT combination, it means with pair of pads and pair of SMDs which are connected in device in parallel (possible from version 6 only). Then you have only one component in schematic and one in board with only one name and value. But then may be a problem with newer assembling automats which are able to place both SMD and THT components, but this is not my problem (we use SMT automat and then we place THT components by hands).

Ideal solution can be done by Eagle development team by implementing shared components, whitch support assigning more than only one package variant for a component in schematic and then work with this on board as a group or selectable separately. The next level of functionality will be done by enabling of grouping of more packages from devices with the same schematic symbol (by name, pin placement etc.) together.

     For some smart solutions like this I am waiting a lot of years yet ...

Hi Shalen,

John's solution with extension of THT pads to accomodate SMD component too is very uncomfortable, especially with a lot of "doubled" components on a board and I mean only possible for hand made boards, it means without soldering mask, paste, glue and usage of SMT automat.

Jorge give you an idea how to do it easily, it means put into a schematic all resistors doubled (SMD and THT) and then put them both ideally sharing the same place on the board. This solution has one problem: you must do everything two times (schematic, values and may be names too and then placement on board and connection of pads).

More complicated on start, but more comfortable on a usage is my way: make your own library component as SMD and THT combination, it means with pair of pads and pair of SMDs which are connected in device in parallel (possible from version 6 only). Then you have only one component in schematic and one in board with only one name and value. But then may be a problem with newer assembling automats which are able to place both SMD and THT components, but this is not my problem (we use SMT automat and then we place THT components by hands).

Ideal solution can be done by Eagle development team by implementing shared components, whitch support assigning more than only one package variant for a component in schematic and then work with this on board as a group or selectable separately. The next level of functionality will be done by enabling of grouping of more packages from devices with the same schematic symbol (by name, pin placement etc.) together.

     For some smart solutions like this I am waiting a lot of years yet ...

Hi Miroslav

Thanks for your expert advise.  I'm using the Eagle 7.1 (freeware version), it doesn't seem to have any option to create or edit components.  How do i go about doing it?