PDF for the KIA324P, a KEC quad operational amplifier compatible with the widely used LM324, in a DIP package as the P suffix suggests.

PDF for the KA4558, a dual operational amplifier in the KA series, equivalent in function to the familiar 4558 dual op amp, size 121 KB.

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.

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.

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.

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.

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…

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.

Schematic of a Class H audio power amplifier, described in Spanish as a Thai design, delivered as a small 718 KB PDF.

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

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.

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.

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…

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.

The 2SC5421 transistor is the subject of this 323 KB PDF, likely a datasheet since 2SC stands for a JIS-registered NPN bipolar device.

Modified 2.1 channel amplifier schematic, a 90.6 KB PDF; the title does not say which original design was altered or which ICs are used.

Document for the 2SD2536 transistor, a 71.6 KB PDF in the schematic category that is most likely its datasheet.

Datasheet-type PDF for the 3SK271, around 32.7 KB, catalogued in the schematic category.

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

Compact 25.2 KB PDF named for the 3SK301, categorised as a schematic but most likely a part datasheet. Nothing besides the type number appears in the name.

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

A 111 KB PDF for the 2SK1453, placed among schematics, although the part-number naming points to a component data sheet.

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…

Datasheet material for the 2SB1037 transistor, delivered as a 122 KB PDF in the schematic category.

Compact 77.2 KB PDF covering the 2SB893 transistor. In JIS numbering the 2SB prefix identifies PNP transistors for low-frequency circuits, such as audio amplifiers and…

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.

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

PDF datasheet for the 2SD879 transistor, roughly 106 KB, with no manufacturer indicated in the file name.

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

Mirrored PCB artwork for a Zener amplifier board, a 237 KB PDF; espejo is Spanish for mirror.

Audio Pro A101 service documentation in PDF form, about 3 MB, with the int-sm tag pointing to an international service manual version.

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