| 摘要 |
PURPOSE:To perform an adjustment to the best turning state in a simple way, by switching the display color when the best receiving state is obtained in addition to a display of the receiving level. CONSTITUTION:The light emitting diodes (17a-17b)-(21a-21b) of different colors of light emission are packaged in pairs to form a display device. A DC output 8'' which is proportional to the input levels of an intermediate frequency amplifier and an FM wave detecting IC2 is amplified by a DC amplifier 7 and then supplied to the 1st and 2nd switching circuit transistors (TR) 43, 44, 47 and 48 as well as to a light emitting diode driving circuit 8. While the outputs fed through the pins 7'-10' of the IC2 are amplified by a DC amplifier 36 and then fed to the 1st and 2nd switching circuit TRs. The outputs of the 1st and 2nd switching circuits TRs are supplied to the bases of light emitting diode driving TRs 22-31 of different colors of light emission. In such constitution, the number of glowing green diodes increases at the side of the diodes 17a-21a toward the turning point. When the best tuning state is obtained, the red light emitting diodes glow among 17b-21b in the number corresponding to the receiving field level. |
