| 摘要 |
A toy figure for detecting and signaling changes in ambient light level in which a detection circuit includes an operational amplifier acting as a comparator for comparing two signals from a voltage divider network. The first input signal is the signal of interest to be detected. The second input signal is held stable by a capacitor with a relatively long time constant. When the first signal exceeds the second signal, a change in output of the comparator is produced to effect both radiation and audio signal outputs from the toy figure.
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