Schematic of a 2.1 channel amplifier based on the TDA2030A, from Technical Mriganka, in a 416 KB PDF.

Power supply schematic for a chip amplifier, provided as a 497 KB PDF with a source tag in the name.

Modified 2.1 channel amplifier schematic, a 90.6 KB PDF; the title does not say which original design was altered or which ICs are used.

2.1 channel hi-fi audio amplifier circuit by Technical Mriganka, a 164 KB PDF. The title does not name the amplifier ICs or output devices, so identify them from the…

BIOS and EC firmware package for the Lenovo Z50-75 on LCFC board NM-A291, compressed into a ZIP of about 2.2 MB.

Technical Mriganka 2.1 amplifier design using the TDA7379 and TDA7377 power amplifier ICs, a 206 KB PDF.

Diagram of a 2.1 preamplifier joined to an audio power amplifier, taken from a YouTube project; the doubled pdf extension is just a naming slip.

PDF schematic for a 2.1-channel power amplifier, meaning two satellite channels plus a subwoofer channel.

2.1 amplifier schematic attributed to Amiru, a compact 98.7 KB PDF. The name gives no details about the ICs or power level, so the diagram itself must be read for…

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…

Datasheet PDF, 312 KB, for the LM324 quad op amp, listed in the schematic category without a manufacturer in the name.

BIOS package for the Gigabyte GA-H81.AMP-UP motherboard at revision 1.0, an 11.2 MB RAR archive. This board uses the Intel H81 chipset.

Small PDF of about 3 KB titled as a DC power supply amperage guide, indexed as a schematic but likely a reference sheet rather than a board diagram.

PDF of 1.01 MB for the LM101A-N, a general-purpose operational amplifier, catalogued under schematics.

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.

2.1 amplifier schematic built around the TDA7294, by Technical Mriganka, in a 219 KB PDF.

PDF schematic of a low pass filter built around the 5532 dual op-amp, intended to feed an audio power amplifier, 126 KB in size; the name suggests it was shared…

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

Apple iPhone 11 Pro diagram excerpt describing the earpiece receiver and its audio amplifier circuit, stored in a 314 KB RAR archive.

Circuit extract for the Apple iPhone 11 Pro covering the power amplifier supply circuit, packed as a 246 KB RAR archive.

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

Schematic for the 60 W NDFL amplifier published by ETI in 1983, combined with a regulated power supply, in a 6.74 MB PDF.

Apple iPhone 11 Pro circuit material for the high-frequency power amplifier section, packed in a 430 KB RAR archive with no format details given in the name.

iPhone 11 Pro circuit excerpt for the low frequency power amplifier circuit, packed into a 369 KB RAR archive.

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

PDF schematic of 45.2 KB for a Dynatech V5000 SMD preamplifier with display section, plus an inverter design attributed to Pappu.

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

Set of BIOS and EC firmware dumps for the Acer Aspire 8942G on the Quanta ZY9B board, compressed into a 1.61 MB 7z archive.

BIOS firmware for the J&W PH67A motherboard, version 1.0 as stated in the name, packed as a 2.39 MB RAR archive.

Boardview archive that covers two Wistron-style board numbers, 10211-1 and 10630-1, together in a 112 KB RAR.

Combined schematic and boardview set for Compal mainboard LA-F401P, packed in a ZIP of about 10 MB.

Zip archive holding an Acer schematic covering the Aspire 7330, 7730, Extensa 7230 and 7630 family, built on Quanta ZY2 and ZY2/ZY6 designs at revision 1A, 919 KB…

PDF document whose Persian title translates as datasheets of amplifier ICs, filed here as a schematic but in practice a reference collection for audio amplifier chips.