XXL LED VU Meter
With a wide range and high resolution
Gerber file
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Component list
Resistors
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
Capacitors
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
Semiconductors
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)
Miscellaneous
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
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