At 108 KB, this PDF is labelled with the transistor type 2SC4221 and nothing else, so no board, model or revision is identified.

Covering the transistor 2SC4104, this compact 19.1 KB PDF is tagged as a schematic, but the 2SC prefix in Japanese JIS numbering identifies an NPN bipolar device, so…

Named only after the JIS transistor number 2SC3461, this 110 KB PDF is listed as a schematic but is most probably a single-part datasheet.

Component reference for the 2SC3392, provided as a 155 KB PDF in the schematic category.

Datasheet-style PDF named for the 2SC5322, 122 KB, though the catalogue labels it a schematic.

Datasheet-style PDF, 96.2 KB, named only for the 2SC3089 and catalogued as a schematic.

The 277 KB PDF named 2SC2878 sits in the schematic category, though the JIS 2SC prefix suggests a datasheet for an NPN bipolar transistor.

PDF reference for the 2SA1682, a part number following the Japanese JIS scheme in which 2SA identifies a PNP bipolar transistor of the high-frequency class.

PDF of 42.0 KB covering the 2SB1392 transistor. The name provides only the part number; manufacturer, package and revision are not given.

Datasheet in PDF format for the 2SA1579 transistor, 36.6 KB. Only the part number is given in the name.

A 59.2 KB PDF describing the 2sb1275 transistor, filed as a schematic though the name points to a single part.

A 55.0 KB PDF titled with the 2SA1531 part number and an _E suffix, catalogued as a schematic yet most plausibly the datasheet for that transistor.

Small PDF document for the 2SA1524, filed under schematics but by its name a component data sheet for a discrete transistor.

PDF reference of 143 KB for the 2SA1419, a JIS-numbered part whose 2SA prefix denotes a PNP transistor in the high-frequency class.

PDF datasheet for the 2SA1338, a part whose 2SA prefix marks it as a PNP transistor intended for high-frequency service under the Japanese JIS convention.

Datasheet PDF of only 13.5 KB for the 2SA684 transistor, marked UTC, which indicates the Unisonic Technologies edition of this part.

PNP transistor documentation for the 2SA1150, provided as a 193 KB PDF. JIS naming uses 2SA for PNP bipolar devices, so although indexed as a schematic the file almost…

Datasheet PDF, 149 KB, for the 2SA1710 transistor; the file name gives no further model or board details.

Part datasheet for the 2N5307, a 57.5 KB PDF classified as a schematic in this catalogue.

Labelled 80EPS08, this 80.7 KB PDF is classed as a schematic but carries a semiconductor part code in International Rectifier style, so it most likely contains a…

The 24WC257 is a Catalyst Semiconductor I2C serial EEPROM, and this 55.6 KB PDF, though catalogued as a schematic, is almost certainly its datasheet.

PDF document for the TDA7491P, a 1.45 MB file that is most likely the component datasheet rather than a board schematic, judging by the part-number name.

PDF datasheet for the PC2002AR-BHO-J display module, a 2002-class part, which by common convention is a 20 characters by 2 lines LCD.

PDF datasheet for the PW065XS4 TFT panel, revision 1.1 per the name, roughly 486 KB. The PW prefix follows the PVI naming pattern, and 065 points to a 6.5 inch class…

PDF specification for the PW036XS3 display panel, revision 1.0, larger than its siblings at about 1.09 MB.

PDF datasheet, 1.23 MB, for the PD104SL6 display panel, which by its 104 code is likely a 10.4 inch class TFT.

Datasheet PDF of 590 KB covering the tiny4, tiny5, tiny9 and tiny10, matching the Atmel AVR ATtiny4/5/9/10 family of very small 6-pin microcontrollers.

Datasheet for the BTA16-600BW, a 16 A, 600 V triac in the insulated-tab BTA family, the B and W indicating its gate sensitivity and snubberless rating class.

Datasheet for the RN-42 Bluetooth module, document version 2.32r, originally from Roving Networks and later Microchip.

A 41.1 KB PDF titled with the part number 2SC1980 and an _E suffix, catalogued among schematics.

Datasheet PDF covering the 2SA1588, 215 KB in size, which suggests several pages with curves and package details.

A 110 KB PDF titled 4GBU series, filed under schematics without any board number, revision or device.

Datasheet for the SN7402N quad 2-input positive NOR gate, part of the classic TTL logic family and packaged in plastic DIP.

PDF schematic of roughly 943 KB labelled TAS6514AL, a name that matches the Texas Instruments TAS series of automotive class-D audio amplifier ICs; no product, board…

PDF reference of 66.9 KB for the KA7500C, a pulse-width-modulation controller from the KA7500 family, compatible with the classic TL494 design.

Small 67.8 KB PDF for the 2SD1854, a part number in the Japanese 2SD series of NPN bipolar transistors, so it is really a datasheet rather than a full schematic.

Component reference for the 2SD1993, a 45.5 KB PDF listed among schematics. Following Japanese JIS part numbering, 2SD identifies an NPN bipolar transistor of the…

Stored as a 190 KB PDF, this document is named after the 2SD1936, a JIS-registered NPN transistor.

File name 2sk198 is a JIS semiconductor number, so this 31.8 KB PDF, though catalogued as a schematic, is best treated as a brief component datasheet.

This small 31.6 KB PDF bears the name 2SK1444LS and is classed as a schematic. The name links it to a suffixed variant of the 2SK1444 without saying what LS stands for.