Single bar 40 dot VU meter with stereo input

Completed

STD Single bar 40 dot VU meter with stereo input

Audio

Measuring

Display_Module

License: CC BY 4.0

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Editors' pick

Update time： 2024-12-26 19:25:25

Creation time： 2024-10-11 23:00:22

Description

A single 40 dot bar VU meter based on a very simple circuit utilizing PIC microcontroller and few passive components. Can be used as single board or 2 boards for left and right sides with respective side inputs.
Display features are selected by jumpers for logorithmic or linear display, dot or bar mode, waterfall or peak hold.
Relativery small board 0.8x4.5" (20x114mm) mostly surface mounted componets with exceptions of LEDs which are 2x5mm

Design Drawing

schematic diagram

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VUM_1x40
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PCB

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PCB_VUM_1x40
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BOM

BOM download Purchase Parts

ID	Name	Designator	Footprint	Quantity
1	47uf	C3,C1	CAP-TH_BD5.0-P2.00-D0.8-FD	2	C78759
2	100nF	C7,C2,C4,C5,C6,C9	0805	6	C62912
3	SMD33-100K	R2	RES-ADJ-SMD_SMD33-10K	1	C9900001299
4	Header-Male-2.54_1x4_C59481	CON1	HDR-TH_4P-P2.54-V-M	1	C59481
5	1N4007	D1	SOD-123FL_L2.7-W1.8-LS3.8-RD	1	C5443964
6	MM3Z16_C123915	D2	SOD-323_L1.8-W1.3-LS2.5-RD	1	C123915
7	term	J1,J2,J3,J4	HDR-TH_2P-P2.54-V-M-1	4	NONE
8	2k2	R1,R11,R12,R13,R14	R0805	5
9	AMS1117-5.0w	VR1	SOT-223	1	C6186
10	180R	R10,R3,R4,R5,R6,R7,R8,R9	R0805	8
11	PIC16F1827-E/SO	U1	SOIC-18_L11.6-W7.5-P1.27-LS10.3-BL	1	C642653
12	LED_LEDSQR2X5	LED1,LED2,LED3,LED4,LED5,LED6,LED7,LED8,LED9,LED10,LED11,LED12,LED13,LED14,LED15,LED16,LED17,LED18,LED19,LED20,LED21,LED22,LED23,LED24,LED25,LED26,LED27,LED28,LED29,LED30,LED31,LED32	LED_LED2X5	32
13	HDR-1X6 / 2.54	ICSP	HDR-1X6 / 2.54	1
14	50k	R15	RES-ADJ-SMD_SMD33-10K	1	C9900001299