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Richard Erlacher
09/17/12 09:30
Read: 463 times
Denver, Co
USA


 
#188374 - use direct wiring when using point-to-point
Responding to: ???'s previous message
The best way to hand-wire a circuit, whether wire-wrapped or soldered point-to-point, as you've done in the picture, is to route your wire directly, in a straight line. This will minimize the route lengths and will keep any coupling between the signals to be more or less randomized. If you "bunch" your wires, or try to make them look like a circuit board, the randomization is less, which means that the impact of coupling will be felt at more or less the same time. This can impact signal integrity.

Further, you should probably use smaller wire, typically, with wire-wrap, one uses #30 AWG wire. What you use is very much your choice, but once you use #30, it will become obvious why that's a good idea. It looks as though you've used #20 or thereabouts in the picture.

It's VERY important that you minimize the distance between power supply bypass components and the power/GND pins. It's also important that you distribute power and gnd nets such that the distance to their sources be minimized. This is especially important with the gnd net, and you should always think about the notion of a single-point gnd, which you will seldom achieve, since wire-lengths are never zero, but keeping those connections to the gnd reference point as short as possible is very important. It's best to use boards that have a GND plane on one side. I personally use boards that have a gnd pland on one side and a Vcc plane on the other. This makes keeping the wires short quite easy.

RE


List of 28 messages in thread
TopicAuthorDate
Nokia 3310 display [PCD8544] dot problem      Samarth Godara      09/14/12 08:02      
   NOTE-      Samarth Godara      09/14/12 08:32      
      Graphics Displays      Michael Karas      09/14/12 09:10      
         memory management      Samarth Godara      09/14/12 09:31      
            it would not      Erik Malund      09/14/12 09:50      
               more help      Samarth Godara      09/14/12 10:30      
                  Search engines?      Per Westermark      09/14/12 12:20      
                     confused      Samarth Godara      09/14/12 13:13      
                        No exact answer      Per Westermark      09/14/12 13:36      
                        Type of Thinking      Michael Karas      09/14/12 14:34      
                           I second that      Erik Malund      09/15/12 08:05      
                              doubt - interfacing memory with 8051      Samarth Godara      09/15/12 11:52      
                                 Why would you want to      Hal Albach      09/15/12 16:58      
                                    Don't overlook the "extras"      Richard Erlacher      09/15/12 20:29      
                                    why to use my own design      Samarth Godara      09/15/12 20:47      
                                       which is corect, but      Erik Malund      09/16/12 06:44      
                                       Wrong approach for India        Kalpak Dabir      09/16/12 06:50      
                                          my approach + new doubt [start execution]      Samarth Godara      09/16/12 09:06      
                                             Perhaps you've overlooked some options      Richard Erlacher      09/16/12 12:44      
                                                my circuiting & a Really surprising, Good Board      Samarth Godara      09/16/12 23:00      
                                                   Not all 805x variants are the same       Richard Erlacher      09/17/12 01:54      
                                                   Besides 8051 there are other....      Kalpak Dabir      09/17/12 02:00      
                                                   BEWARE      Erik Malund      09/17/12 07:38      
                                                      Shortest path      Per Westermark      09/17/12 09:05      
                                                   use direct wiring when using point-to-point      Richard Erlacher      09/17/12 09:30      
                                 Are you determined to fail?      Erik Malund      09/15/12 19:41      
                           SiLabs isn't the only possible solution      Richard Erlacher      09/15/12 20:22      
                        Have you considered the datasheet(s) and 8052.com's search?      Richard Erlacher      09/15/12 20:17      

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