Usually the amplifier is shorted output transistors, DC, power failures, this situation gives reliable, though valid in the lecture but integrated requirements may vary according to the situation of failure. It makes more sense to add additional circuitry to protect the loudspeaker DC-protection circuits to detect and relay the DC output of the power amplifier disables the speaker over at. There are 3 different DC protection circuit printing circuits and schema files in the op amp and the transistor on the organizations.
all circiut:
FILE DOWNLOAD LINK LIST (in TXT format): LINKS-18023.zip
Published: 2011/11/27 Tags: audio control circuits
Atmel AVR Debug Development Board
I see as the most advanced open source Atmel AVR debugging the debug test card can be made also shares some reason always one step ahead in atmel ..
DIP-40 pin socket, reset button SDA and SDL (IIC) can be modified to Pull Up, PWM usbasp connection, USB-connected ATMega8 USB-UART converter, USB-UART bridge connected control circuit debug JTAG, LCD display WH1602B, ADC, Show buzzer, lED display additional controls and more