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Old 9th October 2012, 03:24 PM   #1
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Default Low Power Design Suggestion?

I'm looking to replace the mid-high amp in my computer speaker setup (2.1), and thought it might be a good opportunity to try something solid state for the first time. It doesn't necessarily need to be simple, all I need is a schematic that I won't have to "complete" myself, since I'm completely new to SS.

I have a +13V DC power supply, 4 ohm speakers and would like an output power between 4W and 10W. Frequency response need not go below 200 - 250 Hz, but I should be capable of figuring out the filtering for that.

The original amp is a TDA8511J, and I'm considering using an LM4940, but thought I would check into SS for a change.

Any suggestions?
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Old 9th October 2012, 06:11 PM   #2
sreten is offline sreten  United Kingdom
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Hi,

13V DC will give you about 4 W into 4 ohms and your in car amplifier
territory. Car amplifiers generally use unusual (compared to hifi) output
topologies to get good output voltage swing close to each rail, a typical
hifi amp might only swing to 2V below each rail, 9V versus 13V is a lot.

If you want more power you need a bridged arrangement and that
gets quite complicated in discrete SS for such a simple application.

Chip-amps rule at this sort of supply voltage and power, I think
going for discrete SS is asking for far more trouble than its worth.

rgds, sreten.
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Old 9th October 2012, 07:12 PM   #3
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9V output will give you 20W peak at 4ohm.
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Old 10th October 2012, 03:52 PM   #4
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Thanks for the replies. After more research, I've decided maybe I would like to build a bigger power supply and an F2J.
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