I was planning to create a 30w amplifier circuit for my project. 2 days of searching and
stumbling around the net, then finally I found a site that answers all my
questions and doubt about my project. My
amplifier circuit is a class AB 30w
circuit amplifier.
Below is the instruction on how to set up the class AB
amplifier circuit for 30 watts.
To set the above amplifier up, set R1
to max and R12 to 0. After doing this successfully, power on the amplifier. Set
R1 so that the measured output offset is between 30 and 100mV. Once set, adjust
R12 slowly to achieve a quiescent current of around 120mA. Keep checking the
quiescent current as the amp heats up as it might change due to voltage drop
changes in the output devices caused by heat. The heatsinks should be 0.6K/W or
less for two amplifiers.
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