The 2SD2285 is documented in this 128 KB PDF. Its JIS part number, with the 2SD prefix, places it among NPN transistors intended for low-frequency circuits such as…

The name of this 97.3 KB PDF gives nothing beyond 2SJ277, a JIS-style designation in which 2SJ marks a P-channel FET.

Only the part number 2SJ275 appears in the name of this 97.0 KB PDF. That code follows Japanese JIS numbering, where 2SJ indicates a P-channel field-effect transistor…

Named after the JIS part number 2SJ267, this 91.8 KB PDF most likely documents a P-channel field-effect transistor, since the 2SJ prefix denotes that device class.

Network section schematic for the Samsung SM-A21s, a smaller 1.93 MB PDF. It covers the cellular radio part of the board, typically the RF transceiver, power amplifiers…

PDF schematic covering the microphone, loudspeaker and earpiece circuits of a handset, from a sectioned series of roughly 4.78 MB pages without a model in the name.

Audio Pro Ace Bass B2-40 subwoofer service manual in PDF form, about 1.96 MB, as indicated by the sub and sm tags.

Service documentation for the Audio Pro Ace Bass B1-45 subwoofer, going by the sub and sm tags.

Datasheet PDF for the KIA324P with an additional F suffix in the name, 321 KB, filed under schematics.

Matrix II amplifier document labelled t13 x73-1, provided as a 1.84 MB PDF; the tokens appear to be a variant or board identifier, though their exact meaning is not…

PDF schematic of a 150 W amplifier, marked as a new version and converted from another file format, judging by the name.

PDF schematic for a 2.1-channel power amplifier, meaning two satellite channels plus a subwoofer channel.

Schematic PDF from Sony for the MEX-GS610BE, MEX-GS610BT and MEX-N6050BT car receivers, marked version 1.0 and around 8.47 MB.

Compact PDF datasheet for the MPSA06, an NPN general-purpose transistor rated in the file name at 80 V and 500 mA.

Reference PDF for the BD136, BD138 and BD140 transistor series, catalogued as a schematic but in practice a component datasheet of 51.2 KB.

Network section of the Samsung SM-A05 schematic, packed into a 6.27 MB PDF. It covers the radio part of the phone: transceiver, power amplifier, antenna switch, filters…

Network section of a smartphone schematic in PDF, part of a sectioned set of around 4.78 MB per page; the device model is not given in the name.

Schematic in PDF form labelled safari std, a name that in DIY audio circles usually refers to a Safari power amplifier design, standard version, though the file name…

Top-side PCB print for an R2 amplifier rated 1500 watts into 2 ohms, with the Indonesian note langsung print meaning ready to print directly.

Schematic section for the LG G5 smartphone covering the network or RF part of the circuit, according to its title.

Version 1.0 service schematic for the Sony MEX-BT5100 car stereo with Bluetooth, delivered as a 6.42 MB PDF.

Service manual schematic from Sony for the MEX-BT2500 car audio receiver, version 1.0, in a 5.00 MB PDF; the sm tag points to a service manual.

Service schematic in PDF form for the Ahuja SSA 250, a model in the Ahuja range of public address amplifiers, size 929 KB.

Audio schematic for Apple board 820-2364, also numbered 051-7615 with code 14000, compressed into a 146 KB RAR.

PDF of 1.01 MB for the LM101A-N, a general-purpose operational amplifier, catalogued under schematics.

Audio schematic for the Samsung SM-A23 covering the microphone, loudspeaker and earpiece circuits, packed into a 2.79 MB PDF.

Network (cellular RF) portion of the Samsung SM-A20S schematic in PDF form, 4.63 MB. The pages cover the radio front end, power amplifiers, antenna switches and the…

Samsung SM-A05 audio schematic page showing the microphone, loudspeaker and earpiece circuits, 6.27 MB PDF.

Bottom-side PCB layout for the R2 amplifier design rated 500 watts at 4 ohms, stored as a 138 KB PDF.

Schematic in PDF form for a BCi 450 W amplifier, marked 2R and dated 2013 according to the file name.

Compact 311 KB PDF schematic whose name suggests a bipolar transistor design, probably an audio amplifier, though the label 5_5bipolar_msg is cryptic and gives no brand…

Second part of the service manual for the Audio Pro A4-14 speaker, going by the spk and sm2 tokens.

First part of the service manual for the Audio Pro A4-14 speaker, a 6.15 MB PDF identified by the spk and sm1 tokens and paired with a second volume.

Sony schematic in PDF format for the HCD-SHAKE7, the main unit of a Shake series hi-fi audio system, document version 1.2 and roughly 6.03 MB.

Sheet for the TIP31 NPN and TIP32 PNP complementary power transistor pair, with the name stating 100 V and 3 A ratings; the PDF is 198 KB and listed under schematics.

Datasheet in PDF for the PZT2907A, a PNP small-signal transistor the file name rates at 60 V.

Core board document for a Matrix 1.4 design paired with an R2 1000 watt amplifier, with the trailing 2 R likely meaning a 2 ohm load, in a 398 KB PDF.

Service schematic in PDF form for the Sony HT-S100F, a compact soundbar from the Sony home theatre line.

Sony HT-S500RF schematic delivered as a 5.85 MB PDF, covering the home theatre system named in the file.

Sony service schematic in PDF form covering two car audio head units, the MEX-M71BT and the MEX-N5200BT, about 6.81 MB in size.