BLY94 datasheet specifications
BLY94 is a RF power transistor in a SOT-55 case which operate in class-B with a Vce of 28V and a frequency transition of 175MHz.
BLY 94 output power is 50W with a 7dB ( 6x ) power gain at 175MHz.
74HC4067 datasheet
The 74HC/HCT4067 are high-speed Si-gate CMOS devices and are pin compatible with the 4067 of the “4000B” series. The 4067 contains sixteen bidirectional analog switches, each with one side connected to an independent input/output (Y0 to Y15) and the other side connected to a common input/output (Z).
74hc4067-datasheet
Digital Volume Control circuit schematic
The heart of this digital volume controller DVC circuit is IC2 4067, 16-channel analog multiplexer.
Because the 1kΩ has been connected between every input and output, the multiplexer can act like a potentiometer. The total resistance is 15kΩ . You can use different values for the resistor to obtain a different characteristic. The current consumption is 1mA.
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