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STD P002A: EF95 6AK5 Battery Operated Tube Headphone Amplifier
License: GPL 3.0
- 16
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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| 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 |
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