License

GPL 3.0

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EF95 6AK5 Battery Operated Tube Headphone Amplifier

11 months ago 1674
  • Description
  • Documents
  • BOM
  • Attachments
  • Members
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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 Part 2 Part 3

Blog: https://ratti3.blogspot.com/2020/12/making-battery-operated-ef956ak5-hybrid.html

Documents

EF95 6AK5 Hybrid Tube Headphone Amplifier

Start Delay

Input Selector

LEDs

UC3843B 100v Booster

EF95 6AK5 Hybrid Tube Headphone Amplifier

BOM

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 56K R33 R0805 1 LCSC C137509
4 470K R4,R1 R1206 2 LCSC C137273
5 100nF C19 C0805 1 LCSC C342919
6 S115FA SD1 SOD-123_L2.8-W1.8-LS3.7-RD 1 LCSC C258208
7 MHT170UGCT LED4,LED3 LED0805-RD 2 LCSC C397047
8 270 R2,R5 R1206 2 LCSC C229488
9 ZMM22 ZD2,ZD1 LL-34_L3.5-W1.5-RD 2 LCSC C8073
10 2.2 R38,R39,R40,R37 R1206 4 LCSC C137327
11 220u C13,C14,C12,C11 CAP-D10.0×F5.0 4 Mouser 647-UFG1E221MPM
12 100u C6,C5 CAP-D8.0×F3.5 2 Mouser 647-UFG1E101MPM
13 1.5K R18,R15 R1206 2 LCSC C114929
14 4.7nF C17 C0805 1 LCSC C193083
15 2.2K R41 R0805 1 LCSC C114561
16 1u C7,C3,C4,C9,C10,C8 CAP-TH_L7.3-W7.5-P5.00-D0.5 6 RS-Online 896-1411
17 10K R26 R0805 1 LCSC C114565
18 17-21/S2C-FR1S2L/3T ACTIVE LED0805-R-RD 1 LCSC C264419
19 470uF C20 CAP-SMD_BD8.0-L8.3-W8.3-FD 1 LCSC C193277
20 220uH L1 IND-SMD_L7.3-W7.3 1 LCSC C241217
21 100pF C16 C0805 1 LCSC C508866
22 1 R43,R44 R1206 2 LCSC C137355
23 1K R12,R10 R1206 2 LCSC C131398
24 7.5K R32,R30 R1206 2 LCSC C137232
25 1.8K R29,R31 R1206 2 LCSC C137372
26 1N4002W D3,D2 SOD-123F_L2.8-W1.8-LS3.7-RD 2 LCSC C169542
27 G6K-2P-Y-12V RELAY_OUT,RELAY_IN RELAY-TH_6S-2-4.5VG6K-2P-Y-12V 2 LCSC C132367
28 BC846ALT1G Q2,Q3 SOT-23-3_L2.9-W1.6-P1.90-LS2.8-BR 2 LCSC C163723
29 10K R17,R16 R1206 2 LCSC C132649
30 3K R7,R8 R1206 2 LCSC C229609
31 22K R21 R1206 1 LCSC C114942
32 2K R28 R1206 1 LCSC C133543
33 470u C2,C1 CAP-D10.0×F5.0 2 Mouser 647-UKA1E471MPD1TD
34 PH-2AK PWR_LED,BT_12V CONN-TH_PH-2A 2 LCSC C8886
35 UC3843BVD1R2G U61 SOIC-8_L4.9-W3.9-P1.27-LS6.0-BL 1 LCSC C231572
36 22 R36 R0805 1 LCSC C107702
37 K3-1260D-F1 LED SW-TH_K3-1260D-F1 1 LCSC C223843
38 RK097G VR1 RK097G 1 Mouser 652-PTD902-2015KA503
39 22uF C15 CAP-SMD_BD6.3-L6.6-W6.6-FD 1 LCSC C88142
40 MHT170CRCT LED1,LED2 LED0805-RD 2 LCSC C389523
41 PH-3A RHOS HEADPHONES,LINE_IN,BT_IN,BT_SW,VALVE_LED,PRE_OUT CONN-TH_12P-P2.00-H-W4.8_PH-3A 6 LCSC C2320
42 470pF C18 C0805 1 LCSC C28256
43 15uF C21,C22 CAP-SMD_BD10.0-L10.3-W10.3-RD 2 LCSC C487528
44 FQD2N60CTM Q1 PG-TO252-3_L6.3-W6.5-P4.57-LS10.0-BR-CW 1 LCSC C5386
45 XH-2A 12V CONN-TH_XH-2A 1 LCSC C20079
46 100K R25 R0805 1 LCSC C95781
47 1K R35 R0805 1 LCSC C95781
48 MMBTA92LT1G Q4 SOT-23-3_L2.9-W1.6-P1.90-LS2.8-BR 1 LCSC C82049
49 EF95 V1,V2 B7G-SKT 2 eBay 6AK5
50 100K R11,R9 R1206 2 LCSC C137393
51 10K R23 R0805 1 LCSC C84376
52 1N4148W-7-F D1 SOD-123_L2.8-W1.8-LS3.7-RD 1 LCSC C83528
53 100K R22,R24 R0805 2 LCSC C96346
54 84.5K R42 R0805 1 LCSC C229022
55 2.2K R19,R20 R1206 2 LCSC C114933
56 5.1K R34 R0805 1 LCSC C84375
57 10K R27 R1206 1 LCSC C84376
58 NE5532P U1 DIP-8_L9.4-W6.4-P2.54-LS9.1-BL 1 LCSC C5326

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Comments (2)

RechardP2021 Reply

Hi
Have you thought of adding a main amplifier add on to be able to drive desktop monitors?

Ratti3 Reply

@RechardP2021 I could with power tubes, however it would be a complete redesign as the power tubes would require a higher voltage and more current.

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