Signal indicator on the motor. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Measuring technology
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The circuit shown in the figure (FIG1) is a simple indicator that is triggered when a signal enters the input, for example, a signal from a cell phone call or a beeper.
Often there are situations when it is required that others do not know about the arrival of a signal, and in this case this scheme is indispensable. When a signal is received, a miniature motor starts to rotate (with an eccentric attached to the axis) and the person feels a slight vibration.
The circuit shown in the figure (FIG2) differs only in less sensitivity and the appropriateness of using the circuits is determined based on the level of the input signal. The sensitivity and response threshold of the device are determined by the resistance R3 and capacitor C1 (FIG1).
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