Project document describing an automatic car washing and drying system controlled by an 8051 microcontroller, provided as a 533 KB PDF.

Speaker protection circuit for a 2.1 audio setup, a user-drawn design in a 139 KB PDF. Such boards normally delay relay engagement at power-up to stop thumps and…

Spanish microelectronics course in PDF form, 4.14 MB, without any specific device, brand or board named.

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

Class H power supply schematic, version 0.2, fuse type, marked final, in a 1.39 MB PDF.

Schematic for Quanta G3AE motherboard DAG3AEMBCD0, packed as PDF in a 3.43 MB RAR. Quanta is an ODM building boards for several laptop brands, and the DA prefix with MB…

Top-side print for a universal dos vas Matrix board, likely a dual voltage-amplifier-stage module, marked langsung print, meaning ready to print directly.

Reference design document for an adjustable-output 200 W SEPIC power supply, a 3.26 MB PDF.

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.

Hi-fi 2.1 amplifier schematic credited to SeahorseDIY, in a 688 KB PDF. It covers a stereo-plus-subwoofer layout, likely with the crossover or filter stage feeding the…

Training course material on basic electronics repair, 7.26 MB PDF, catalogued with schematics although it is an educational guide rather than a board diagram.

Reference sheet in PDF format, 236 KB, describing LVDS connector pinouts. The name names no device or panel model, so treat it as a generic guide to low-voltage…

Learn Arduino, a Spanish guide in a 5.69 MB PDF focused on the Arduino microcontroller platform rather than repair of a specific device.

Main document for the subwoofer 7294 design, version 1.1, a 138 KB PDF without a further descriptor in its name.

Compact PDF schematic whose name points to a parametric equalizer combined with a subwoofer filter stage.

Schematic in PDF format for a bridged-tied-load subwoofer amplifier labelled 2050, where BTL means two amplifier halves drive the speaker in bridge mode for higher…

PDF schematic for a HuaQin-designed notebook board with project code NB2372, packed in a RAR archive of about 1.2 MB.

Circuit schematic for the subwoofer 7294 project, version 1.1, a 55 KB PDF. The name suggests an amplifier built around the TDA7294 audio power IC, but the PDF itself…

Matrix 1.4 amplifier design in BTL configuration, meaning bridge-tied load where two amplifier halves drive the speaker in opposite phase, as a 1.76 MB PDF.

Soft start circuit schematic, saved as a 1.78 MB PDF; the note in the name indicates it was converted from another format.

Regulated power supply for a preamplifier, drawn in a 601 KB PDF schematic with a source tag in the name.

A PDF collection of fun basic electronic projects, filed under schematics and 406 KB in size.

Spanish repair training document titled learning to repair, a 4.09 MB PDF and a different file from the similarly named from-scratch course.

Second chapter of a Spanish course introducing cellular phones and their technology, saved as a 503 KB PDF.

Quanta ZG5 schematic as a 1.03 MB PDF, with no revision in the file name; its size matches the rev 1A copy, but identical content cannot be confirmed from the name.

Document on building a transmission line loudspeaker enclosure, a 498 KB PDF filed among schematics.

PCB document for an R2 power amplifier listed at 1000 watts, as a 3.50 MB PDF. The larger size suggests detailed artwork, possibly with both layers or component…

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

Simple preamplifier schematic built around the NE5532 dual low-noise op-amp, a 405 KB PDF; the extra tag in the name only marks the source site.

Schematic PDF for a Philips 32PFL3xxx television on the TP.VST59S.P89 chassis, 3.33 MB, with T3 in the name indicating a variant.

PDF schematic for Compal board LA-4182P, project ALC0, revision 2.0, packed as RAR. Compal is the ODM behind the LA-xxxxP numbering, building boards for several laptop…

Romanian-labelled schematic of a preamplifier with tone corrector, meaning a bass and treble tone control section, provided as a 330 KB PDF.

PDF circuit diagram of a mono tone control stage built around two transistors, as the name indicates.

Pegatron schematic for a board code-named Viper2, with the reference P7RCR in the file name.

Schematic for the board code-named MIHAWK, Wistron board number 15208-3 with the further code 06J01, as a 4.84 MB PDF.

Schematic for the Acer Aspire 3 A315-22 notebook, whose mainboard is the Huaqin design NB8607, compressed into a 1.80 MB rar.

Wistron schematic for board number 19817-1, archived in a 5.96 MB RAR with the PDF inside.