So i have a 328 smt board analog-reading 6 pots, 4 outs to a L298 to relays, and a "wave shield". I'm just using a wall wart power supply. Between the 12vdc and Vcc is a empirical ~100[ch937] resistor because the regulator was getting quite hot. I upload the code and it works swell, with or without the external power (relays and L298). I then unplug the usb and "reboot" on DC to a very reproducible crash. After the hang, the device will no longer work until i re-upload the program again. What is the problem? I wouldn't think its the code. Is there a current surge during boot that the resistor fatally limits? Extra caps at Vcc -> ground don't help. The output (on a scope) of the power supply looks normal. Do I really need a zener et al? I am missing something as the avr eats it so easily; everything else is triple checked. Any advice is much appreciated. Thanks in advance.
Seeing as I cant find an earlier post that answers my questions.............
I want to use a 14.@#$% crystal for video purposes... I know very little about crystals................ but have a good grasp on DC theory...... Will I need to adjust the values of the accompanying caps?
Or more generally, how closely are the caps tuned?
Should their [5 * (timeconstant)] be tuned to the crystal?
Should should their 5 * .707 * (timeconstant) be the crystal freq.?
etc. could some one even point me to a resource? as I cant really dig a good explaination up....