I'm building my first standalone arduino project (atmega328 on stripboard). I power it through a 7805 regulator which has 10uF caps on input and output. The 7805 is on a separate circuit board. The wire from the 7805 to atmega328's VCC is about 20 cm (ten inches) long, quite thick (0.75mm2) wire, pl…

Standalone arduino/capacitors

Grumpy_Mike December 9, 2012, 8:56pm 2

Should I place an additional cap between atmega328's VCC and GND (and AVCC and GND)

Yes.
0.1uF