P002A: EF95 6AK5 Battery Operated Tube Headphone Amplifier

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STD P002A: EF95 6AK5 Battery Operated Tube Headphone Amplifier

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License: GPL 3.0

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Update time： 2023-10-07 12:31:41

Creation time： 2020-12-03 21:43:58

Description

EF95/6AK5 Tube Headphone Amplifier, it's a hybrid amplifier meaning the final amplification is done using an op-amp. The amplifier consists of a UC3843 100v booster for the tubes, an ABLIC S-8254 4s battery protection system, a LM3914 battery level meter, a TP4056 battery charger and a MH-M18 bluetooth module. This project is the main amplifier baord, this is enough to run the amplifier and the other modules are not necessary. See other projects for additional schematics. YouTube Video of project: [Part 1](https://youtu.be/28DwrHB3h8w) [Part 2](https://youtu.be/93-n6Ngaj2w) [Part 3](https://youtu.be/hZghhSwPwPA) Blog: [https://ratti3.blogspot.com/2020/12/making-battery-operated-ef956ak5-hybrid.html](https://ratti3.blogspot.com/2020/12/making-battery-operated-ef956ak5-hybrid.html)

Design Drawing

schematic diagram

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EF95 6AK5 Hybrid Tube Headphone Amplifier
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Input Selector
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LEDs
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UC3843B 100v Booster
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PCB

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EF95 6AK5 Hybrid Tube Headphone Amplifier
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BOM

BOM download Purchase Parts

ID	Name	Designator	Footprint	Quantity	BOM_Supplier	BOM_Supplier Part
1	47K	R13,R14	R1206	2	LCSC	C137270
2	4.7K	R6,R3	R1206	2	LCSC	C137262
3	470K	R4,R1	R1206	2	LCSC	C137273
4	270	R2,R5	R1206	2	LCSC	C229488
5	100u	C6,C5	CAP-D8.0×F3.5	2	Mouser	647-UFG1E101MPM
6	220u	C12,C14,C13,C11	CAP-D10.0×F5.0	4	Mouser	647-UFG1E221MPM
7	1.5K	R15,R18	R1206	2	LCSC	C114929
8	1u	C8,C10,C7,C9,C4,C3	CAP-TH_L7.3-W7.5-P5.00-D0.5	6	RS-Online	896-1411
9	1K	R12,R10	R1206	2	LCSC	C131398
10	10K	R16,R17,R27	R1206	3	LCSC	C84376
11	3K	R7,R8	R1206	2	LCSC	C229609
12	22K	R21	R1206	1	LCSC	C114942
13	470u	C2,C1	CAP-D10.0×F5.0	2	Mouser	647-UKA1E471MPD1TD
14	PH-2AK	PWR_LED,BT_12V	CONN-TH_PH-2A	2	LCSC	C8886
15	RK097G	VR1	RK097G	1	Mouser	652-PTD902-2015KA503
16	PH-3A RHOS	PRE_OUT,HEADPHONES,LINE_IN,BT_IN,BT_SW,VALVE_LED	CONN-TH_12P-P2.00-H-W4.8_PH-3A	6	LCSC	C2320
17	XH-2A	12V	CONN-TH_XH-2A	1	LCSC	C20079
18	EF95	V2,V1	B7G-SKT	2	eBay	6AK5
19	100K	R9,R11	R1206	2	LCSC	C137393
20	2.2K	R19,R20	R1206	2	LCSC	C114933
21	NE5532P	U1	DIP-8_L9.4-W6.4-P2.54-LS9.1-BL	1	LCSC	C5326
22	ZMM22	ZD1,ZD2	LL-34_L3.5-W1.5-RD	2	LCSC	C8073
23	10K	R26,R23	R0805	2	LCSC	C84376
24	17-21/S2C-FR1S2L/3T	ACTIVE	LED0805-R-RD	1	LCSC	C264419
25	1N4002W	D2,D3	SOD-123F_L2.8-W1.8-LS3.7-RD	2	LCSC	C169542
26	G6K-2P-Y-12V	RELAY_OUT,RELAY_IN	RELAY-TH_6S-2-4.5VG6K-2P-Y-12V	2	LCSC	C132367
27	BC846ALT1G	Q3,Q2	SOT-23-3_L2.9-W1.6-P1.90-LS2.8-BR	2	LCSC	C163723
28	K3-1260D-F1	LED	SW-TH_K3-1260D-F1	1	LCSC	C223843
29	22uF	C15	CAP-SMD_BD6.3-L6.6-W6.6-FD	1	LCSC	C88142
30	100K	R25,R24,R22	R0805	3	LCSC	C96346
31	MMBTA92LT1G	Q4	SOT-23-3_L2.9-W1.6-P1.90-LS2.8-BR	1	LCSC	C82049
32	1N4148W-7-F	D1	SOD-123_L2.8-W1.8-LS3.7-RD	1	LCSC	C83528
33	2K	R28	R1206	1	LCSC	C133543
34	MHT170UGCT	LED3,LED4	LED0805-RD	2	LCSC	C397047
35	1.8K	R29,R31	R1206	2	LCSC	C137372
36	7.5K	R30,R32	R1206	2	LCSC	C137232
37	MHT170CRCT	LED1,LED2	LED0805-RD	2	LCSC	C389523
38	56K	R33	R0805	1	LCSC	C137509
39	100nF	C19	C0805	1	LCSC	C342919
40	S115FA	SD1	SOD-123_L2.8-W1.8-LS3.7-RD	1	LCSC	C258208
41	2.2	R38,R39,R40,R37	R1206	4	LCSC	C137327
42	4.7nF	C17	C0805	1	LCSC	C193083
43	2.2K	R41	R0805	1	LCSC	C114561
44	470uF	C20	CAP-SMD_BD8.0-L8.3-W8.3-FD	1	LCSC	C193277
45	220uH	L1	IND-SMD_L7.3-W7.3	1	LCSC	C241217
46	100pF	C16	C0805	1	LCSC	C508866
47	1	R44,R43	R1206	2	LCSC	C137355
48	UC3843BVD1R2G	U61	SOIC-8_L4.9-W3.9-P1.27-LS6.0-BL	1	LCSC	C231572
49	22	R36	R0805	1	LCSC	C107702
50	470pF	C18	C0805	1	LCSC	C28256
51	15uF	C22,C21	CAP-SMD_BD10.0-L10.3-W10.3-RD	2	LCSC	C487528
52	FQD2N60CTM	Q1	PG-TO252-3_L6.3-W6.5-P4.57-LS10.0-BR-CW	1	LCSC	C5386
53	1K	R35	R0805	1	LCSC	C95781
54	84.5K	R42	R0805	1	LCSC	C229022
55	5.1K	R34	R0805	1	LCSC	C84375