Analog VU-METER for audio equipment

Ongoing

STD Analog VU-METER for audio equipment

Audio

Measuring

License: Public Domain

Mode:

Editors' pick

Update time： 2022-11-23 20:20:59

Creation time： 2022-10-10 15:11:09

Description

This schematic is used in one of the mixing decks and the circuit is exactly, with all the nominal values of the elements transferred to a new, separate board. Please note that a split source of +15/-15 Volts is used to power the device.
Two red led`s show peak levels, yellow led`s - middle (4 level), main section - green led`s - 7 levels. One blue led LD13 it is power indicator. It can be mounted both on the board and separately by connecting wires. Blue led is a part of circuit, cannot be removed.

UPD: 22 Nov 2022, tested, working fine. If any LED`s is not glow - check LED`s!

Design Drawing

schematic diagram

（ 1 / ）

VU-Meter_schematic
Open in Editor

PCB

（ 1 / ）

PCB_vu-meter-BG
Open in Editor

The preview image was not generated, please save it again in the editor.

BOM

BOM download Purchase Parts

ID	Name	Designator	Footprint	Quantity
1	0.1u	C1,C2,C3,C4,C5,C6,C11,C12,C13,C14,C15,C16	C0603	12
2	47p	C7,C10	C0603	2
3	4.7μF	C8,C9	SMD_E-CAP-B-4	2
4	100uF	C17,C19	CAP-SMD_BD6.3-L6.6-W6.6-LS7.4-FD	2
5	LL4148	D1,D2,D3,D4,D5,D6	SOD-80_L3.5-W1.5-RD	6
6	HDR-M-2.54_1x6	J1	HDR-M-2.54_1X6	1
7	LED-DIP-3MM_GREEN	LD1,LD2,LD3,LD4,LD5,LD6,LD7,LD8,LD9,LD10,LD11,LD12,LD13,LD14,LD15,LD16,LD17,LD18,LD19,LD20,LD21,LD22,LD23,LD24,LD25	LED-TH_BD4.1-P2.00-D0.6-RD_GREEN	25
8	SMMBTA56LT1G	Q1,Q2	SOT-23-3_L2.9-W1.3-P1.90-LS2.4-BR	2
9	8.2k	R1	R0603	1
10	5.6k	R2	R0603	1
11	2k	R3	R0603	1
12	1.3k	R4	R0603	1
13	620	R5	R0603	1
14	510	R6,R16,R17	R0603	3
15	470	R7,R9,R11	R0603	3
16	330	R8,R10	R0603	2
17	120	R12,R14,R15	R0603	3
18	56	R13	R0603	1
19	10k	R18	R0603	1
20	100k	R19,R20,R23,R24	R0603	4
21	180k	R21,R22	R0603	2
22	22	R25,R26	R1206	2
23	1	R27	R0603	1
24	LM339NSR	U1,U2,U3,U4,U5,U6	SOP-14_L10.3-W5.3-P1.27-LS7.8-BL	6
25	4580	U7	SOP-8_L5.0-W4.0-P1.27-LS6.0-BL	1