Lm391 N100

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everybody has been arround this ic some times

havent touch any of them for years but out of the blue one amp that used it come in to the shop for repair .

while searching first for the ic it shelf ( it was blown beyond repair he he :D ) then i looked at the application which was the exact copy of the original application as given by national .....


then i noticed that eventhough i bias network exists to provide adjustable bias for the drivers and output there is no vbe multiplier ,,,,,,meaning that as amplifier warm probably bias will drift ....upwise as usual

any ideas ???? am i missing something ???
 
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