... C.F. 0.1 6 7 0.1 VCC R57 1.6 k r60 1.6 k R63 1.6 k R67 1.6 k Q71 Q57 Q60 Q63 Q66 Q69 R69 4.7 k R71 470 R73 Q73 22 k R72 470 R69 50 k R76 620 R77 22 k R79 1.6 k R81 1.6 k R83 32 k R47 7.5 k R39 R41 15 k 15 k R49 R68 52 k Q79 Q80 Q86 Q88 C6 ...
... by connecting an RVA resistor (r60) between REG and SLPE or decreased by connecting an RVA resistor (R61) between REG and LN. This internal voltage reference is decoupled by capacitor C3 between REG and VEE.
This decoupling capacitor re...
Versatile speech/dialler/ringer with music-on-hold
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