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[on:]

I'm getting the

avrdude: stk500_getsync(): not in sync: resp=0x00
avrdude: stk500_disable(): protocol error, expect=0x14, resp=0x51

error messages with an Arduino Duemilanove that I've been using for months without problem. I've read most of the threads about the problem and the trouble-shooting guide. Nothing that I've tried seems to have helped.

I was playing with as short sketch to get sound from an 8 ohm speaker. The sketch has pin 3 connected to an 100k ohm linear potentiometerr with the wiper connected to the red lead on the speaker and the black lead to the Arduino ground.  I was getting sound from the speaker for awhile and then the above problem started.

I can accept that in my electronic ignorance I may have fried the atmega328.  What I'd like to know is:  Is it likely that replacing the chip with the bootloader will fix the problem?

[Reply #1 on:]

what was the resistance of the speaker? 8 ohm or ....?

With the potmeter completely to one side you got only the speaker between GND and the 5V => At 8 ohm  you got 5Volt/8 ohm ~= 625mA ==  bit too much.

Probably you need to replace the 328 chip with another one.