Audio schematic for the Samsung SM-A21s covering microphone, loudspeaker and earpiece, PDF, 3.82 MB.

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

2.1 amplifier schematic using the 2SC5200 and 2SA1943 complementary power transistor pair, in a 184 KB PDF.

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

Part datasheet for the 1SV281, a 70.1 KB PDF filed as a schematic. Diodes numbered in the 1SV series are varactors, used where a reverse-biased junction acts as a…

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

HA17324 reference in PDF form, 64.4 KB, for the Hitachi quad operational amplifier in the 324 family.

A 74.1 KB PDF covering the 1SV283 component, indexed under schematics. Parts with the 1SV prefix belong to the variable-capacitance diode family, so this is expected to…

Datasheet in PDF form, 74.0 KB, for the 1SV278 diode, assigned to schematics in this index.

Data reference for the 1SV239, a 70.1 KB PDF whose trailing underscore carries no meaning. The index files it as a schematic.

The 3SK263 is covered by an 82.7 KB PDF placed in the schematic category, though a part-number name like this normally indicates a component datasheet.

Toshiba-style 1SV324 documentation in a 71 KB PDF, catalogued under schematics. 1SV is the Japanese JIS designation for diodes, applied in this range to varactor diodes…

PDF documentation of the 1SV307 diode, about 69 KB and listed as a schematic. The part number follows the JIS 1SV pattern, which Toshiba uses for variable-capacitance…

Specification sheet for the 1SV284 part in PDF format, 69.8 KB, listed in the schematic category.

Spanish-language schematic for a stereo amplifier titled Zener, rated at 1000 W, in a 1.15 MB PDF.

Book in PDF form, about 7.88 MB, covering valve and transistor audio amplifiers; the tag in the name only reflects where the copy was sourced.

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…

Datasheet-style document for the 3SK302, a 26.0 KB PDF indexed as a schematic. The 3SK prefix in Japanese JIS numbering denotes a four-terminal N-channel field-effect…

PDF reference, 69.7 KB, for the 1SV293 part, sitting in the schematics section of the index.

PDF for a Zener 100 W mono amplifier with a quasi-complementary output stage, as indicated by the Spanish word cuasi, 569 KB in size.

Yamaha PA 2400 amplifier schematic in a small 194 KB PDF. The name gives no revision or note about modifications, so it may represent the standard circuit, but confirm…

Datasheet PDF for the 2SK1058, a 55 KB file. This part number belongs to the 2SK series of N-channel field-effect transistors and is widely known from audio power…

The 1SV277 is documented in this 71.9 KB PDF, which the catalogue lists as a schematic.

Spanish document about the diode, a 373 KB PDF of component theory rather than a schematic for a specific device. The name gives no product or board number.

The 1SV314 is described in this 73 KB PDF, listed under schematics in the catalogue. The prefix follows the JIS semiconductor registration for diodes and is used by…

Reference PDF for the 1SV313 diode, around 73 KB and filed as a schematic. In the JIS scheme the 1SV prefix marks a diode, and Toshiba uses it for variable-capacitance…

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.

Bottom copper layout for the universal dos vas Matrix board, probably a dual voltage amplifier stage module, tagged langsung print for direct printing.

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…

Covering the 1SV322, this 71 KB PDF is indexed as a schematic but is most likely the component data sheet.

Single-component sheet for the 1SV291, saved as a 73.7 KB PDF and tagged as a schematic.

Indexed as a schematic, this 63.9 KB PDF carries the name 1SV265 and nothing else. Under Japanese 1S numbering, the 1SV prefix denotes a Toshiba variable-capacitance…

Named 1SV262 with a trailing underscore, this 74.5 KB PDF is filed as a schematic. The underscore adds no technical information.

Schematic of a 1000 W audio power amplifier rated into 2 ohms, marked R2, RLVA SE1, 2012 revision 1, in a 110 KB PDF.

Filed as a schematic, 1SV231 is a 68.1 KB PDF named after a component code; the trailing underscore is not part of it.

Bearing only the part number 1SV249, this 62.1 KB PDF is indexed among schematics but is most likely a component data sheet.