Small 67.6 KB PDF filed under BQ24727, a Texas Instruments battery charger controller found on many laptop motherboards.

Document named f970, attributed by name to its author yahya, provided as a 3.14 MB PDF.

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.

A 1.17 MB Microchip datasheet for the PIC16C9xx family, PIC16 microcontrollers with a built-in LCD driver module.

Toshiba-style part number 1SV264 names this 65.3 KB PDF, which the index lists under schematics.

Filed as a schematic, this 65.8 KB PDF takes its name from the 1SV246 part number and carries no other details.

PDF datasheet of 64.7 KB covering Zener diodes from 1N4728A to 1N4754A, a subset of the 1 W axial Zener series.

Audio section of the Samsung SM-A20S schematic covering microphone, loudspeaker and earpiece circuits, a 4.63 MB PDF.

Samsung SM-A10 audio schematic covering microphone, speaker and earpiece, provided as a 2.25 MB PDF.

Section of iPhone 11 Pro circuitry dealing with the microphone circuit, supplied as a 457 KB RAR archive.

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.

Component datasheet in PDF format, about 1.26 MB, whose name suggests the DTC115EE series, a family of pre-biased digital transistors with built-in resistors.

PDF of 97.5 KB covering the 2SA1729, a component listed in this index as a schematic although the name describes a single part.

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

Audio section of the Samsung Galaxy A02s (SM-A02S) schematic in PDF, covering microphone, loudspeaker and earpiece circuits, at 1.79 MB, smaller than the other pages in…

Datasheet for the PE12864-001 LCD module, supplied as a 249 KB PDF. The 12864 in the part number conventionally indicates a 128 x 64 dot graphic display, a very common…

Schematic or layout for a PA-300 amplifier, possibly a 300 watt public address design, saved as version 1 in a 1022 KB PDF, with a timestamp suggesting an April 2023…

Schematic for the PMA400 Lambda amplifier, a 400 W audio power amp design credited to Rat Net, supplied as a 477 KB PDF.

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

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

Audio Power Amplifier Design by Douglas Self, a 13.7 MB PDF book. The title is a well-known engineering reference on solid-state amplifier topologies, distortion…

Reference sheet in PDF form covering the 1SV214, filed under schematics although at 75 KB it reads like a single-part data sheet.

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.

Graphic LCD datasheet for PG192128LRS-BYA-B, a 284 KB PDF. The 192128 portion indicates a 192 x 128 dot panel, and BYA-B identifies a specific backlight colour…

Series datasheet PG192128-B for a 192 x 128 dot graphic LCD module, 99.0 KB in PDF format.

Datasheet for the PE160160ARF-001-H LCD module, a 445 KB PDF. The 160160 group in the part number points to a 160 x 160 dot graphic display.

Specification for the PE12864LRF-001-H graphic LCD module in PDF format, 457 KB. The 12864 code indicates a 128 x 64 pixel layout, a size widely used in industrial…

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

Combined data document for the BD135, BD137 and BD139 transistors, filed under schematics, 51.0 KB in PDF form.

PE10264ARF-001-H module datasheet, a larger 2.62 MB PDF, likely containing detailed drawings and controller information.

Zener diode datasheet covering the 1N4678 to 1N4702 range, provided as a 74.2 KB PDF. The series is a family of low current Zeners whose part numbers map to nominal…

PDF series datasheet PG192128-A, 96.7 KB, covering a 192 x 128 dot graphic LCD module. The A tag appears to mark the earlier edition of the series document, with the B…

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…

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

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

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

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

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…

PDF sheet for the BC557 general-purpose PNP transistor, the name giving its minus 50 V and minus 100 mA limits, filed under schematics at 45.8 KB.

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.