Audio Pro Ace Bass A101 service manual, with the int tag suggesting an integrated amplifier, though the name does not state this firmly.

Large 24.8 MB PDF schematic for the MHC-V83D, a high-power home audio system model name used by Sony, though no brand is given in the file data.

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

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

Datasheet for the LM358, revision 7, a 133 KB PDF. The LM358 is a widely used dual operational amplifier found in power supplies, chargers, audio stages and control…

Datasheet in PDF for the IRFP250, an N-channel power MOSFET in the large TO-247 package.

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

2.1 amplifier schematic using the 2SC5200 and 2SA1943 complementary power transistor pair, in a 184 KB PDF.

PDF document named TDA2824, a designation used for a dual low-voltage audio power amplifier IC.

The 2SD2129 transistor is documented in this 216 KB PDF datasheet, catalogued among schematics.

PDF schematic titled simply 4kw, most likely a high-power audio amplifier rated around 4 kilowatts.

Datasheet for the LM358A, a 4.09 MB PDF. The LM358 family are dual operational amplifiers, commonly found in power supplies, chargers, monitor boards and battery…

Component PDF for the 3SK285, 22.2 KB, placed in the schematic section of the index. Only the part number is given.

Compact 42.7 KB PDF covering the 2SB1183 transistor. The JIS-style 2SB prefix identifies a PNP device designed mainly for low-frequency circuits, commonly found in power…

Component placement drawing for the Apex AX 20 amplifier board, a 61 KB PDF. It shows where each resistor, capacitor, transistor and connector sits on the PCB, which…

An 88.0 KB PDF for the 2SD1838, a Japanese-registered NPN bipolar transistor, best treated as a datasheet even though it is indexed as a schematic.

A 94.8 KB PDF documenting the 2SD895, indexed as a schematic though the name names a single transistor.

Datasheet PDF, about 180 KB, for the 2SB1481, filed in the schematic section of the index under its bare JIS part number.

Sony schematic for the MEX-BT5000 car stereo with Bluetooth, provided as a 6.75 MB PDF with no version indicated.

The file name gives nothing beyond 2SC3460, a Japanese JIS designation in which the 2SC prefix denotes an NPN bipolar transistor.

Covering the 2SA1837, this 173 KB PDF is listed as a schematic but is expected to be a transistor datasheet.

Datasheet for the 2SK1058 transistor from Hitachi Semiconductor, a small PDF of about 40 KB.

Schematic documentation for the HT-S100F soundbar, in PDF format of around 8.40 MB, a model designation used by Sony, though the name gives no revision.

The 466 KB PDF here is titled only 2SC4841, a Japanese JIS transistor code where 2SC stands for NPN.

Component sheet for the 2SA1940 transistor, provided as a 172 KB PDF and listed among schematics.

Yamaha PA 2400 amplifier schematic in a small 194 KB PDF. The name gives no revision or note about modifications, so it may represent the standard circuit, but confirm…

Datasheet for the 2SD612K transistor, a 303 KB PDF listed in the schematic section. The K at the end belongs to the type number and indicates a variant of the 2SD612…

A 214 KB PDF for the 2SA1429 part, catalogued as a schematic though most likely a data sheet.

Top-side print for a universal dos vas Matrix board, likely a dual voltage-amplifier-stage module, marked langsung print, meaning ready to print directly.

Realtek ALC272 datasheet in PDF form, 1.28 MB. The ALC272 is a High Definition Audio codec found on many laptops, providing headphone, speaker and microphone interfaces.

The largest of this group at 465 KB, the PDF named 2SC4394 is most likely a full datasheet for that transistor rather than a board schematic, despite its index label.

At 275 KB, this PDF for the 2N6050 is one of the larger sheets in the set. It is indexed as a schematic, though it is most likely a full datasheet with curves.

Datasheet for the 2N5415, a high-voltage PNP bipolar transistor, stored as a compact 45.3 KB PDF in the schematic section.

Datasheet in PDF (236 KB) for the TL081, a single JFET-input operational amplifier widely found in audio gear, filters, power supply control loops and instrumentation.

Part datasheet for the 2SK2033, provided as a 296 KB PDF and filed under the schematic category. The 2SK prefix follows the JIS standard for N-channel FETs.

Here the 2SK1234 N-channel field-effect transistor is described in a 46.1 KB PDF. The 2SK code marks it as an N-channel device under the Japanese JIS scheme, used in…

Named for the 2SB1214 transistor, this 71.3 KB PDF is catalogued as a schematic but is expected to be the part's datasheet.

Studiomaster M1000 schematic, supplied as a 576 KB PDF. Studiomaster builds professional audio gear such as mixers and amplifiers, and a diagram like this is used to…

PDF schematic whose name is only the code CDX-G1152U. That code matches the style of a Sony car audio head unit model, but the name gives no further revision or board…

Reference document on toroidal transformers, a 5.83 MB PDF; no device, brand or model is named.