LM3915 UA741 Vu-meter

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STD LM3915 UA741 Vu-meter

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Update time： 2023-02-04 19:50:20

Creation time： 2021-04-14 15:59:18

Description

This is a Vu-meter that uses the IC LM3915 and UA741. UA741 is amplifing the signal based on the poosition of PR1 trimmer.

Design Drawing

schematic diagram

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PCB

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BOM

ID	Name	Designator	Footprint	Quantity
1	220nF	C1,C8	RAD-0.2	2
2	100nF	C2	RAD-0.2	1
3	1uF	C3,C7	RAD-0.2	2
4	47uF	C4,C6	CAP-D5.0×F2.0	2
5	220uF	C5	CAP-TH_BD8.0-P3.50-D1.0-FD	1
6	1N4148	D1,D2,D3,D4	DO-35_BD2.0-L4.0-P8.00-D0.5-FD	4
7	Bar(on)/Dot(off)	K1,K2	SWITCHSILICONE	2
8	HL-304H3GD	LED1,LED2,LED3,LED4,LED5,LED6,LED7,LED8,LED9,LED10,LED11,LED12,LED13,LED14,LED15,LED16,LED17,LED18,LED19,LED20	LED-3MM/2.54	20
9	INL/R	P1	HDR-TH_3P-P2.54-V	1
10	VCC	P2	HDR-1X2/2.54	1
11	220k	PR1,PR2	RES-ADJ_3296W	2
12	47k	R1,R2,R15,R16	R_AXIAL-0.3	4
13	330	R3,R14	R_AXIAL-0.3	2
14	470k	R4,R13	R_AXIAL-0.3	2
15	10k	R5,R12	R_AXIAL-0.3	2
16	2k2	R6,R11	R_AXIAL-0.3	2
17	68/1W	R7,R10	R_AXIAL-0.5	2
18	1k	R8,R9	R_AXIAL-0.3	2
19	LM3915N	U1,U4	DIP18	2
20	UA741IN	U2,U3	DIP8	2
21	Z6V2	ZD1,ZD2	DO-35_BD2.0-L4.0-P8.00-D0.5-FD	2