Catalogued as a schematic, this small PDF of 42.3 KB is in practice a component data document for the 2SB852K, a part numbered under the Japanese JIS scheme where the…

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…

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.

Top-side PCB print for an R2 amplifier rated 1500 watts into 2 ohms, with the Indonesian note langsung print meaning ready to print directly.

Datasheet for the FDS4435, a Fairchild P-channel MOSFET in an SO-8 package, stored as a 163 KB PDF.

Component data for the BC517 NPN Darlington transistor, the name giving ratings of 500 mA and 30 V, catalogued under schematics as a 111 KB PDF.

Component documentation for the 2SK2713, catalogued here as a schematic but in practice a small 144 KB PDF typical of a part datasheet.

Sony KDL-40V3000 schematic covering both the power supply and the backlight inverter, packed in a single 1.65 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.

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

Large PDF of about 30 MB titled SMD codes 2014, a reference book of marking codes for surface-mount components rather than a board schematic.

Datasheet in PDF for the MPSA44, a high-voltage NPN small-signal transistor. The file name gives only the part number, so ratings should be read from the document…

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.

Second copy of the BC517 NPN Darlington transistor datasheet, rated 500 mA and 30 V according to the name, also 111 KB in PDF form.

A small 41.5 KB PDF for the 2SD1458, a part number in the Japanese JIS scheme where 2SD identifies an NPN low-frequency transistor.

Part-number document for the 2SJ561, stored as a 160 KB PDF and tagged as a schematic. In Japanese transistor numbering, 2SJ stands for a P-channel FET, so the content…

A small 13.7 KB PDF filed as a schematic but named for the 2SC1384, an NPN transistor under the JIS 2SC prefix, with UTC indicating the Unisonic Technologies version of…

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.

Spanish tutorial on recognising components in a schematic, a 310 KB PDF intended as training rather than a diagram for a specific device.

PDF SMD codebook for mobile repair, 3.04 MB, listing marking codes found on small surface-mount parts.

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

Schematic in PDF form for a stereo preamplifier with a loudness control, a common DIY audio circuit that boosts bass and treble at low listening volume.

Schematic in PDF for a Sony power supply with part number 1-474-218-11, designed by Delta as model APS-272.

Schematic in PDF form for the Samsung power supply board BN44-00300A, with the name marked as tested, suggesting the drawing was checked against a real board.

Schematic in a compact 464 KB PDF, named PA-1650-56LC, a code that appears to be a power adapter model number; the file name gives no brand or further details.

PDF schematic for a PA-1650-56LC adapter, a model code in the style of LiteOn's PA-1650 series, generally 65 W class laptop chargers.

PDF schematic of a LiteOn PA-1360-2 adapter, with no output rating given in this file name; a companion document lists it as 12 V 3 A, 36 W.

SMD Codebook in PDF form, 3.04 MB, a reference listing marking codes found on small surface-mount parts. It is not a schematic for a specific device.

The SMD Codebook in PDF form, 3.04 MB, is a reference guide that matches the short marking codes printed on small surface-mount parts to their full part numbers.