Wireless microsensors in factories, hospitals, cars, and so on process information that can save money, energy, and lives. Unfortunately, tiny batteries exhaust quickly, and replacing so many of them frequently is impractical. This is why recharging them with ambient energy is so appealing, especially when vibrations, for example, are abundant and steady. Still, tiny piezoelectric transducers draw so little power that they hardly damp motion. Luckily, pre-damping the transducer draws more power. This paper shows that symmetrical and asymmetrical pre-damping strategies draw the same power, but of the two, the proposed symmetrical case consumes less energy and therefore outputs more power. With this approach, the proposed system consumes 82% less power and generates 7.8× more output power.