Elektor Team
About the article

Audio Limiter

for DVD

Audio Limiter
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.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD members can exclusively download these files for free as part of their membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service.

Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

Component list
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
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
D1,D2 = zener diode 8V2 0.4W
IC1,IC2 = NE5532
IC3,IC4 = 4067
IC5 = LM339
IC6 = 4538
IC7 = 4093
IC8 = 4516
K1-K4 = cinch (RCA) socket, PCB mount, e.g., Monarch T-709G
PCB, order code 024074-1
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