some of the componenets will not work as they need higher voltages
The meter won't show everything. An oscilloscope might.Try some decoupling capacitors.http://www.thebox.myzen.co.uk/Tutorial/De-coupling.html
If the 328 works with a separate 5V on it, but not when running off the 7805,then it sounds like some of the other components in the circuit may be crowbarringthe 7805.
Just a thought about voltages in your circuit.Your transformer will give a peak voltage of 1.414 x 24 volts ( 33.936 ) at the rated output. If you are drawing less current, which seems likely, the peak voltage will be higher. The spec for a 7805 is maximum input 35 volts, your rectifier will drop a few volts but it might still output more than 35 volts so it might keep shutting down.
or add your own winding for a low voltae tap
Please enter a valid email to subscribe
We need to confirm your email address.
To complete the subscription, please click the link in the
email we just sent you.
Thank you for subscribing!
via Egeo 16