| 摘要 |
PURPOSE:To attain the use of a single section of multisection variable resistor with simple constitution by using a variable capacitor setting tone quality of each band and a variable resistor for data storing the position of the set variable volume for switch changeover in common. CONSTITUTION:Variable resistors VRa-VRc are used as so-called equalizer variable resistors because the sound volume through the variable resistors VRa-VRc is adjusted by band split by coils L1-L3 when switches S1-S3 are turned on to adjust the tone quality outputted from an amplifier A2 to an output terminal OUT. Further, the output level set by the adjusting position of the variable resistors VRa-VRc is converted into a digital signal by an A-D converter 1 when switches S4-S6 are turned on. Data depending on the position of the variable resistors VRa-VRc are stored according to the preference of the user are stored in a RAM 4 and data in response to the source are stored in advance in a ROM 7 to set the variable resistors VRa-VRc as required. |
