High quality stereo HI-FI combo amplifier 02

(2) The central component of the ten-fold circuit amplifier and tone controller
    still uses the king of op amps NE5532.
When 1C1 is used as a ten-fold circuit amplifier , it is to compensate for
the lack of gain when the tone controller is used alone. IC2 forms a negative feedback
tone controller, and RP1, RP2, and RP3 are used for low, mid, and treble adjustments respectively. The control range is not less than ±12d8. RP4
is the volume controller. This tone controller uses the operational amplifier NE5532. The control effect on low and treble is excellent, the treble is clear
and delicate, and the bass is rich and powerful. Especially the bass control effect is excellent, surpassing some so-called bass add-on boards. Interested parties may
wish to compare this tone controller with commercially available multi-band tone equalizers to see which one is more cost-effective. Considering the independent use of this
tone controller , the power supply of the op amp NE5532 is stabilized by voltage stabilizing blocks 7815 and 7915, so there is no need to use this voltage stabilizing
block.