| 摘要 |
PURPOSE:To detect a tuning state, and the extent and direction of a shift from a tuning position by a simple circuit, by using a voltage frequency converter, and driving one LED at a frequency which corresponds to an input signal level. CONSTITUTION:A received signal is amplified by an amplifier 11 and then sent to a V-F converter 12 to be converted into pulses which have a frequency corresponding to an input signal level. Those output pulses are sent to an LED13 fitted to a slider 14 moving on a scale 15. When the slider 14 is at a tuning position, the LED13 lights up continuously, and when it shifts from the tuning position, the LED13 flashes. The flashing speed becomes higher and higher as the slider shifts from the tuning position more and more, and becomes lower and lower as the slider is closer and closer to the tuning position. Thus, the simple circuit detects a tuning state and the extent and direction of the shift from the tuning position. |
