- on Audio/Video/Photography
- Published in issue 6/2014 on page 40
XXL LED VU Meter
With a wide range and high resolution
Already a member? click here to log in.
CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor 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.
Default: 0.25 W 1%
R1 = see text and Table 2
R2 = 10kOhm
R3,R6,R9 = 820Ohm
R4a = 36kOhm
R4b,R7b = 2.4kOhm
R5,R8,R11 = 47Ohm
R7a = 9.1kOhm
R10 = 1.6kOhm
R12,R13,R14 = 680Ohm
P1–P6 = 100Ohm trimpot, horizontal
C1 = 1000µF 35V, low ESR, 5mm pitch, 13mm diam.
C2 = 10µF 16V, low ESR, 2mm pitch, 5mm diam.
C3 = 1µF 100V, MKT, 5mm pitch
C4 = 1nF, 5mm pitch
C5–C10 = 100nF, 2.5mm pitch
C11,C12,C13 = 22nF, 2.5mm pitch
B1 = DB101
D1–D50 = 10-element LED bargraph display, green, 10.16 x 25.40 mm
D51–D60 = 10-element LED bargraph display, red, 10.16 x 25.40 mm
IC1–IC6 = LM3915N
IC7 = LM7812 (TO220)
J1,J2,J3 = 2-pin pinheader, 0.1’’ pitch
6 pcs. DIP-20 IC socket for LED bargraph displays
6 pcs DIP-18 IC sockets for LM3915 Ics
PCB # 120698-1