| 摘要 |
PURPOSE:To aboid mis-lighting of a stereo indicator by retarding the release of stop of a drive circuit of the stereo indicator slower than the release of stop of a generating circuit of a 38kHz switching signal at the release of stop. CONSTITUTION:In selecting an FM band through the operation of a band selection switch, the 1st PNP tansistor (TR) 22 is turned off earlier and the 2nd PNP TR 24 is turned off with a delay. Thus, the 1st NPN TR 23 is turned off earlier, the operation of a generating circuit VCO 15 of the 38kHz switching signal is restarted at first and then, the 2nd NPN TR 27 is turned off to restart the operation of a drive circuit 16. In setting the time constant so that the operation of the VCO 15 is made stable at the time of the restart of the drive circuit 16, the malfunction of the drive circuit 16 due to the transient state of the VCO 15 is not caused. |
