![]() The 2073, like many of the low-power chips intended for portable stereo device applications, is configurable as a pair of mono devices, or as a single BTL (brideged-mode) channel with more power. Long, long battery life and mucho loudness. I've been used an NJM/JRC2073 that I pulled from some cheap computer speakers and it rocks. A good one will ask for little current until you slam the strings. Of course one of the things about power-amp chips used in battery-powered applications is how much quiescent current they require. Of course if you have a way of sinking the heat generated, you should be able to push the lower-suffix models a little further, not unlike being able to overclock a CPU if your cooling system is more effective. A transistor is a semiconductor device used to amplify or switch electrical signals and power.The transistor is one of the basic building blocks of modern electronics. The -1 and -3 crap out at lower output levels. ![]() The 386-4 is comfortable dissipating 700mw. Rather, it is an indicator of how much power they can safely dissipate unassisted. The suffix on the 386 has nothing to do with quality. Tell a 386 or a 5532/34 or an 833 to do so, and they will. Tell your 741 or 4558 to feed an 8 or 2-ohm load and it will not respond politely. What is special about them is that they behave themselves when feeding a very low impedance load. There are a bazillion 8-pin dips that can serve as power-amps.
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