Chemical reactions go faster at a controlled temperature and in the presence of some vibration, which helps to mix reagents. A legacy design used a small motor vibrator as found in silent pagers and mobile phones. This allowed some frequency variation but the amplitude could not be independently controlled.
Our customer commissioned a moving armature device which worked over the desired frequency range. We designed and built an efficient circuit to drive the actuator with independent control of frequency and amplitude. This is what the final product looks like.
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