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coolhead 26th July 2011 07:07 AM

Which amp
I have a 150va transformer with secondary of 24-0-24 un-use and since i have some free time I want to build a chip amp. From schematic it is quite easy to build and can do with simple point to point connection.

The problem now is which chip to choose with the transformer I have. Older chip LM3875, LM3886 and LM4780 or newer chip LME49810 and LME49811 or OPA548 and 549?

Guthorst 26th July 2011 07:44 AM

Dear coolhead,

after rectification, your transformer will give you a +/-34V supply voltage. Your chipamp should withstand that voltage, including a 10 percent overvoltage margin. This voltage is too high for OPA548 and OPA549, they have a limit of +/-30V.

The LME49810/49811 is not a power amplifier. It is only a driver, which needs an externally connected and designed output stage.

LM3875 and LM3886, and also the stereo amplifier LM3780 will work and are easy to implement, with few external components.


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