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.

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

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.

Sony LCD television schematic for the KDL-32V2000 with the 40 and 46 inch versions of the same series, on the WAX2 chassis, as a 13.6 MB PDF.

PDF datasheet for the MPSA64, a PNP Darlington transistor that the name lists at -30 V and 800 mA.

Service manual for the Audio Pro B1.35 MK2 subwoofer, read from the B1_35MK2, sub and sm tokens in the name.

Circuit diagram for a two-way active audio crossover, supplied as a 134 KB PDF. The name gives no designer, part numbers or crossover frequency, so expect a generic…

Sallen-Key subwoofer filter schematic as a 389 KB PDF, with a source tag in the file name.

Audio schematic section for the Samsung SM-A12 covering the microphones, loudspeaker and earpiece, delivered as a 3.40 MB PDF.

Vivo Y83 phone schematic material in a 631 KB RAR archive containing a PDF, named after a fault where the handset was heavily dropped and then stopped sending messages.

Partial schematic for the Samsung SM-A720, Galaxy A7 2017, focused on the microphone, speaker and buzzer circuits, supplied as a 1.42 MB PDF.