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Can I force Eagle to do single-sided PCB [message #154434] Mon, 17 March 2014 12:32 Go to next message
Arthur Rodman
Messages: 9
Registered: March 2014
Junior Member
I'm new to Eagle (Freeware Licence) and am doing the exercises to gain
some competence with it.  Slow going thouh, finding parts is a nightmare
for me.
Suppliers don't use siilar numbers et.
Anyway, that is not my question.
Most of my exercises result in 2 layer PCB.   Can I forc a single ;ayer
PCB.   I want to make my own PCBs

Thanks

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Re: Can I force Eagle to do single-sided PCB [message #154441 is a reply to message #154434] Mon, 17 March 2014 18:24 Go to previous messageGo to next message
Rob Pearce
Messages: 470
Registered: September 2012
Senior Member
On 17/03/14 12:53, Arthur Rodman wrote:
> Most of my exercises result in 2 layer PCB. Can I forc a single ;ayer
> PCB. I want to make my own PCBs

The best way to design a single-sided PCB is not using the autorouter.
There is a tutorial (and example in the base install) for how to
"encourage" the autorouter to avoid the top layer, but you'll find it
struggles. Better to route it yourself and just not use the top.

Of course, if you're doing your own etching, you can always use the top
copper layer to represent the half-dozen link wires you just can't avoid
with a single-sided board :)
Re: Can I force Eagle to do single-sided PCB [message #154458 is a reply to message #154441] Tue, 18 March 2014 19:16 Go to previous messageGo to next message
Arthur Rodman
Messages: 9
Registered: March 2014
Junior Member
Hi, and thanks for the response.  Reading what you've written it seems
that I can't do a single sided board really,
If I use the top copper layer to represent the link wires then it's
double layer after all.
I do wish to etch my own etching (nothing grand I hasten to say) and was
thinking of using the toner transfer approach
hence single-sided.   If I have to utilise both sides of the board then
I'm not so sure about toner transfer.
Either way, thanks a lot for your input.

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Re: Can I force Eagle to do single-sided PCB [message #154462 is a reply to message #154458] Tue, 18 March 2014 21:48 Go to previous messageGo to next message
Rob Pearce
Messages: 470
Registered: September 2012
Senior Member
On 18/03/14 19:43, Arthur Rodman wrote:
> Hi, and thanks for the response. Reading what you've written it seems
> that I can't do a single sided board really,

Yes, you can. I have done, often, and we use Eagle to design the
single-sided boards for young people to etch on an SU holiday I help on.

> If I use the top copper layer to represent the link wires then it's
> double layer after all.

No, because you don't need to etch the top layer. What I'm suggesting is
that, as you lay out your circuit, you will undoubtedly hit a point
where you just can't route a signal and you need to put in a link wire.
Since that link wire exists only for routing purposes and is not part of
the circuit, you don't really want the hassle of adding a
pseudo-component. Instead, what you do is "route it on the top", making
sure you avoid components and use a straight track if possible. Then
when you come to etching, you ignore the top layer entirely and just
etch the bottom. When you have drilled the board and are ready to
populate, show the top layer again as your "wire links population guide".

> I do wish to etch my own etching (nothing grand I hasten to say) and was
> thinking of using the toner transfer approach

I've not tried toner transfer. If home-etching I use a transparency and
UV exposure box. However, the design approach is the same.

> Either way, thanks a lot for your input.

You're welcome.
Re: Can I force Eagle to do single-sided PCB [message #162828 is a reply to message #154434] Mon, 17 August 2015 22:40 Go to previous message
rudraksh gupta
Messages: 1
Registered: August 2015
Junior Member
when you click on autorouter option the menu pops up just change top to
na and voila you will have single sided routes

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