Yes, yet another minimal Arduino, using a simple stripboard. It comes with a 5V regulator on-board. Here is the schematics ad parts list:
It is also easy to build a minimal shield, to build projects on top. Here is how:
Here is a minimal-Arduino implementation:
Here is a shield implementation (it uses self-made extra-long stackable headers, something like these ones, that can be easily soldered under the stripboard):
And here is the minimal Arduino with its shield on top:
...ready to host some project...
Please, note that this implementation takes the schematics from this official standalone version,
but it has a strange wiring of AREF pin to VCC(+5V). This should be
avoided (accordingly to ATMEGA328 datasheet) and, in fact, official
Arduino schematics does not have such a connection, and adds a 100nF cap
between AREF and GND for noise reduction when using analog input pins.
You can refer to this new post for a more correct version.