Encasing Blueprints

Re: Encasing Blueprints

Postby guest » Tue Jan 24, 2012 9:20 am

you may not need the pullup resistor
so if its working without it
dont worry

if youre running the opamps off a single supply
do you have any bias setting resistors
to move the voltage up to 1/2vcc
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Re: Encasing Blueprints

Postby mitcho » Tue Jan 24, 2012 10:50 am

hmm... no.. i just went after this schematic
Image
taken from the TDA2822M datasheet http://www.datasheetcatalog.org/datasheet/SGSThomsonMicroelectronics/mXqwxzy.pdf
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Re: Encasing Blueprints

Postby guest » Wed Jan 25, 2012 3:11 am

i had looked up the wrong datasheet
that circiut is fine for small input signals

the datasheet also listed a bunch of other chips
that are used in portable cassette players
perhaps they would be useful as well
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