Hallo Paul,

I have fabricated a quick layout for you, to demonstrate how easy it is to design a PCB with PC. It's the result of about 2 hours of work. Please keep in mind, that this is no ready solution. It wasn't tested, it's only for demonstration purpose.

PCB consists of two layers (double-sided PCB). You can see, that both layers consists of a ground plane. But only the lower side contains a solid ground plane. With double sided PCB solid ground planes are only achievable, when crossings of layer, means vias, are minimized as possible. The actual layout does only contain 6 crossings and one bridge.
The advantage of a bridge is, that solid ground plane need not to be interrupted. But, of course, bridges cause additional soldering time, which is a disadvantage. Bridges should be preferred, when the interruption of ground plane at critical places can be avoided. This is the case for Vcc connection to 74HCT08.

First you can see the layout without ground planes. So, you can better see the individual connections:



Now you can see the upper side of PCB, with ground plane:



Here comes the lower side of PCB. Please notice how little interrupted the ground plane is:



Finally, a detailed view. You can easily see, how the ground connections are made. No inductive traces, but an immediate connection to the ground plane. Keep in mind, that these ground connections must be done at both sides of PCB!



In the final layout I always put some additional vias to link both ground planes together. This furtherly reduces inductivity of upper ground plane.

By the way, I have inserted a discharge resistor at the reset generator. Also, 100kOhm and 100nF are a better solution than 10kOhm and 10µF.

I will not forget to tell you, that I only use state-of-the-art reset controllers, and no RC-circuits like shown here!!! Make your experiments with this simple reset circuit, but never forget, that this is only an amateurish solution...

Good luck,
Kai