Need help (EAGLE Software)

[sled]

Hi,

I'm building a very basic BFO detector for getting more experience with electronics and eagle. So I took a schematic and rebuilt it with EAGLE.

(I took it from http://home.clara.net/saxons/bfo.htm ).

But sometimes there are bold dots and sometimes there are no bold dots. What do they mean? And another thing is that there are dozen of resistors and capacitors which all look quite the same... Which one do I have to use? Because I want to create a PCB out of the schematic.

Last thing is that I get about 37 warnings about missing junctions. How can I fix this?


Thanks!

best regards

sled

[Qiaozhi]

Eagle Schematic

Hi,

I'm building a very basic BFO detector for getting more experience with electronics and eagle. So I took a schematic and rebuilt it with EAGLE.

(I took it from http://home.clara.net/saxons/bfo.htm ).

But sometimes there are bold dots and sometimes there are no bold dots. What do they mean? And another thing is that there are dozen of resistors and capacitors which all look quite the same... Which one do I have to use? Because I want to create a PCB out of the schematic.

Last thing is that I get about 37 warnings about missing junctions. How can I fix this?


Thanks!

best regards

sled

You have used "wire" to connect up the schematic instead of "net". That's why the tie dots are missing.
Also, there are no values on any of the components. You can add the correct values by selecting the "value" icon from the lefthand palette.
May I make a suggestion? Have a look at this tutorial here -> http://www.cadsoft.de/cgi-bin/downlo...le/program/4.1 It should answer all your questions, including many you've not thought of yet.
There's also a guided tour available online at http://www.cadsoft.de/Tour/tour00.htm
Hope this helps.

[Glennk]

But sometimes there are bold dots and sometimes there are no bold dots. What do they mean? And another thing is that there are dozen of resistors and capacitors which all look quite the same... Which one do I have to use? Because I want to create a PCB out of the schematic.

Last thing is that I get about 37 warnings about missing junctions. How can I fix this?

Bold dots means that there are connection betwen the crossing wires.
No bold dots in a crossing means that there are NO connection betwen the wires.

Missing junctions is just that there are "loose ends" in your chematic, might be the connections betwen some (or all?) of the wires in your chematic.
Click the junction button on the left menu, and then click all the junctions and crossings of wires that should be connectet to each other.

Glenn

[Unregistered]

Hi SLED,
this is a very simple detector circuit (not the simplest, by the way) and if you examine the circuit on the website you have posted, I suspect the original "artist" has realised he (she) has produced a pretty ambiguous drawing.

This is shown by the one and only specific "NC", pointed out at the bottom of the circuit diagram.

This stands for "No Contact" and given the rest of the circuit, you can be sure that wherever one line touches another (EXCEPT FOR THE NC MARKED ONE), there IS contact.

I don't understand why the artist didn't just "fill in the dots" and show the crossed over line without one, i.e. adopt standard practice.

Hope this helps,
Sandy
P.S. have fun with your project.