Digital volume control-2. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Tone, volume controls
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The controller was conceived to work with a remote wired remote control, has 16 volume levels controlled by volume up and reset buttons. DD1 - counter, produces a 16-bit binary code to control the T-shaped voltage divider. DD2 is used as a clock generator. DD3 inverts the signal from the counter.
R1..R5 1K C1 10mkF*16V DD1 K555IE7
R6..R9 22K C2 47mkF*16V DD2, DD3 K555LN1
R10 - R14 3.9K C3,C4 100mkF*16V DA1 KR142EN5A
R11 - R15 2.2K
R12 - R16 1K VT KT3102
R13 - R17 510
R18..25 22K
1 - increase volume
2 - reset
3 - clock output
The control element is made on resistors R6 / R7, R8 / R9 and transistor switches, which, by connecting certain resistances to a common wire, formed a T-shaped voltage divider.
Publication: cxem.net
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