phenidone/appnote-amplifierHeadphone amplifier based on schematic in the LME49600 datasheet
Wireclone is an open-source printed circuit board by phenidone, from the phenidone/appnote-amplifier repository on GitHub. It is a 2-layer board of 98.4 × 48.3 mm with 53 parts on 23 nets, routed with 416 tracks and 115 vias.
It is built around the LME49720NA, LME49600TS and LM7812CT, with the LM7912CT among its other parts. Its parts include 18 capacitors, 10 resistors, 6 ICs, 6 diodes and 4 connectors. It belongs with the audio and music boards of this library.
This is a PCB design for a headphone amplifier based on the example schematic in the LME49600 datasheet.
You will need a 12VAC or 24VAC centre-tapped transformer. The simplest/safest option is to use it with a Class-II (double insulated) accredited 12VAC 0.5A plugpack and not ground any part of this design.
Use Phoenix-style screw terminals.
Place a 10K dual-gang A-scale volume pot between the signal source and the inputs to this board. Use 0.1"-pitch Phoenix-style screw terminals.
There is a bare patch on the board surrounding the output stage; you can solder a strip of copper sheet here to act as a heatsink, if that seems to be necessary (almost certainly not). Note that it will be connected to the negative rail, so don't let the heatsink touch anything.
Rev.A is missing reverse-protection diodes around the regulators. They are considered best-practise for cases where the input voltage on a regulator may collapse faster than its output and as such should not be necessary for this design - the regulators should be the only current drain upon the rectifier capacitors. They have been added to Rev.B on the basis of paranoia and can be hand-soldered onto the underside of a Rev.A board.
The BOM lists 7812 and 7912 regulators and 12VAC supply, which is more voltage than most headphones require. For headphones of no more than 64 ohms, a 7805 and 7905 are enough and will need only a 6VAC transformer.
This hardware design is (C) 2017 William Brodie-Tyrrell and is licensed under the CERN OHL; see cern_ohl_v_1_2.pdf
| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | 1k | Resistors_SMD:R_0805 | R1, R3, R7, R8, R9, R10 |
| 6 | M7 | Diodes_SMD:D_SMA | D1, D2, D3, D4, D5, D6 |
| 4 | 1000u | Capacitors_ThroughHole:C_Radial_D16_L25_P7.5 | C17, C18, C19, C20 |
| 4 | 10u | Capacitors_SMD:C_1206 | C9, C10, C11, C12 |
| 4 | 1M | Resistors_SMD:R_0805 | R2, R4, R5, R6 |
| 4 | 1u | Capacitors_SMD:C_0805 | C1, C2, C7, C8 |
| 4 | 1u | Capacitors_SMD:C_1206 | C3, C4, C5, C6 |
| 4 | FIDUCIAL | smd:FID0.5 | FID1, FID2, FID3, FID4 |
| 2 | 100n | Capacitors_SMD:C_0805 | C21, C22 |
| 2 | CONN_01X02 | Pin_Headers:Pin_Header_Straight_1x02_Pitch2.54mm | P2, P4 |
| 2 | LME49600 | power:TO-263-5 | U3, U4 |
| 2 | LME49720 | Housings_DIP:DIP-8_W7.62mm_Socket | U1, U2 |
| 1 | CONN_01X03 | Terminals_Phoenix:TerminalBlock_Phoenix_MPT-2.54mm_3pol | P1 |
| 1 | CONN_01X03 | Pin_Headers:Pin_Header_Straight_1x03_Pitch2.54mm | P3 |
| 1 | LM7812CT | Power_Integrations:TO-220 | U5 |
| 1 | LM7912CT | Power_Integrations:TO-220 | U6 |
The 48 most common of 53 parts.
It measures 98.4 × 48.3 mm and has 2 copper layers, 1.6 mm thick.
53 parts, built around the LME49720NA, LME49600TS, LM7812CT and LM7912CT. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
From the phenidone/appnote-amplifier repository on GitHub, at the commit this page was made from: the board is wireclone.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Its repository states no licence, so its author keeps all rights: ask phenidone before reusing the design.
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