Matrix 1.4 amplifier design in BTL configuration, meaning bridge-tied load where two amplifier halves drive the speaker in opposite phase, as a 1.76 MB PDF.

Large 962 KB PDF for the LM324P, the quad operational amplifier in a plastic DIP package, as the P suffix commonly indicates.

Schematic PDF for the DXA 1802, size 1.63 MB, matching the name of an Ahuja public address amplifier model, although the brand is not stated in this name.

Service schematic for the Bose AM15P, as named in the file, likely an amplifier or powered bass module from an Acoustimass-type speaker system.

PDF of 6.86 MB titled for an XTi series, with no brand given in the name. Crown sells a power amplifier line called XTi, so the document may relate to it, but contents…

Modified schematic for the Yamaha PA-2400 power amplifier, an 83 KB PDF marked as version 1 and apparently a copy of an earlier file.

Speaker protection circuit for a 2.1 audio setup, a user-drawn design in a 139 KB PDF. Such boards normally delay relay engagement at power-up to stop thumps and…

Portuguese PDF of 70.8 KB on audio in LCD televisions, a short technical note rather than a model-specific service diagram, with no brand or chassis named.

Schematic document in PDF format, about 1.80 MB, filed under the name TAS6534, which looks like a Texas Instruments part number from the TAS automotive class-D audio…

Zener mono power amplifier rated 500 W, documented in a 952 KB PDF. The name gives no revision or further details, so verify the content on opening, which may include…

Infineon datasheet for the IRS20957SPBF, document version 1.02 in English, as a 457 KB PDF.

Updated schematic for the IRS D900 class D amplifier, rated from 200 to 500 W and credited to Rat Net, in a 423 KB PDF.

Matrix 1.4 amplifier document tagged WS3, likely a variant or board revision label, in a 978 KB PDF. The name does not state power rating or load.

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…

Compact PDF schematic whose name points to a parametric equalizer combined with a subwoofer filter stage.

PDF schematic of the HT-S40R home theatre system, about 1.50 MB, the name carries no board number or revision.

Equalizer circuit diagram supplied as a 263 KB PDF. The file name only says equalizer and gives no brand, model or board reference, so it cannot be tied to a particular…

Service manual for the Audio Pro Ace Bass B1-39 subwoofer, a compact 272 KB PDF that likely holds the core amplifier schematic and perhaps a parts list.

Circuit schematic for the subwoofer 7294 project, version 1.1, a 55 KB PDF. The name suggests an amplifier built around the TDA7294 audio power IC, but the PDF itself…

Audio section of the Samsung SM-A11 schematic covering the microphones, loudspeaker and earpiece, as a PDF of 4.33 MB.

Ground resistance map for the iPhone 7 Plus RF power amplifier area, labelled LBDSM_RF in the Chinese title, supplied as a 7.31 MB PDF.

PCB document for an R2 power amplifier listed at 1000 watts, as a 3.50 MB PDF. The larger size suggests detailed artwork, possibly with both layers or component…

Merged PDF of application circuits for the STK41XX series, the Sanyo thick-film hybrid power amplifier modules used in many audio systems and mini components.

Simple preamplifier schematic built around the NE5532 dual low-noise op-amp, a 405 KB PDF; the extra tag in the name only marks the source site.

Network or RF section from the Samsung Galaxy A30s (SM-A30S) schematic collection, as a 4.29 MB PDF file.

Audio page of the Samsung SM-A30S (Galaxy A30s) schematic, covering microphone, loudspeaker and earpiece circuits, saved as a 4.30 MB PDF.

Service manual PDF for the Audio Pro TA150 receiver, matching the rec and sm tags in the name.

PDF schematic named only Ramsés, with no device type, brand or board number given, so its contents can only be confirmed by opening it.

Audio Pro Ace Bass B4-200 subwoofer service manual, going by the AceBassB4_200, sub and sm tokens.

Small PDF schematic sheet titled gain booster bottom, apparently covering the bottom side or lower section of a gain booster circuit, likely a signal amplifier board.

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

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…

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.

PCB artwork for the top side of an R2 class power amplifier rated around 500 watts into a 4 ohm load, saved as a 177 KB PDF.

Network and cellular RF section of the Samsung Galaxy A12 (SM-A12) schematic, 3.40 MB PDF.

Schematic PDF of 2.29 MB for a tone control circuit with low, mid and high adjustment plus a sub-woofer section, according to the name.

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

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

Indexed as a schematic, the 124 KB PDF named 2SJ193 most probably holds the datasheet for that JIS-numbered P-channel FET.

An 80.6 KB PDF named after the 3SK265, filed under schematics but most likely a datasheet for that single device.