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Audio Limiter

for DVD

Published in issue 312, July 2002

Those of you who are lucky enough to possess a DVD player and have watched a movie with lots of special effects, will certainly have noticed that the dynamic range of the audio can be very extreme. So much so that during normal use it is desirable to take steps in the form of an automatic volume limiter. If the DVD player is connected to an audio installation, then it is, in principle, not difficult to install such a limiter between the player and the audio system. It is important, of course, that the limiter does not introduce any distortion.

Components

Resistors:
R1,R20 = 47kOhm 
R2,R21 = 1kOhm 07
R3,R22 = 976Ohm 
R4,R23 = 866Ohm 
R5,R24 = 768Ohm 
R6,R25 = 698Ohm 
R7,R26 = 604Ohm 
R8,R27 = 549Ohm 
R9,R28 = 475Ohm 
R10,R29 = 442Ohm 
R11,R30 = 383Ohm 
R12,R31 = 340Ohm 
R13,R32 = 309Ohm 
R14,R33 = 274Ohm 
R15,R34 = 243Ohm 
R16,R35 = 215Ohm 
R17,R36 = 1kOhm 78
R18,R37 = 100Ohm 
R19,R38 = 3kOhm 3
R39,R40 = 18kOhm 
R41 = 270kOhm 
R42 = 100kOhm 
R43,R44,R45 = 1MOhm 
R46,R47 = 330Ohm 
P1 = 5kOhm preset
Capacitors:
C1 = 10nF
C2 = 470nF
C3 = 1µ F MKT, lead pitch 5 or 7.5 mm
C4 = 220nF
C5-C14 = 100nF ceramic
C15-C18 = 220µ F 25V radial
Semiconductors:
D1,D2 = zener diode 8V2 0.4W
IC1,IC2 = NE5532
IC3,IC4 = 4067
IC5 = LM339
IC6 = 4538
IC7 = 4093
IC8 = 4516
Miscellaneous:
K1-K4 = cinch (RCA) socket, PCB mount, e.g., Monarch T-709G
PCB, order code 024074-1

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	024074-1 (USD 24.20)