PCB layout for a Matrix amplifier rated 125 watts, labelled Beta 2008, as a 266 KB PDF.

Final PCB artwork for an amplifier using Sanken output transistors, labelled 7 set, which likely indicates seven pairs of output devices, delivered as a large 7.42 MB…

Schematic or layout for a PA-300 amplifier, possibly a 300 watt public address design, saved as version 1 in a 1022 KB PDF, with a timestamp suggesting an April 2023…

Schematic for a mosque mixer, the Indonesian name Mixer Masjid, model Master Box X6, provided as a 585 KB PDF despite the doubled extension in the original name.

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.

Matrix II amplifier document labelled t13 x73-1, provided as a 1.84 MB PDF; the tokens appear to be a variant or board identifier, though their exact meaning is not…

Updated release of the Matrix II t13 x73-1 amplifier document, marked new, in a 1.69 MB PDF.

Top-side PCB print for a Matrix i4 amplifier rated 250 watts into 4 ohms, tagged langsung print, Indonesian for print directly.

Bottom copper artwork for the Matrix i4 amplifier board rated 250 watts at 4 ohms, labelled langsung print, meaning ready for direct printing.

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.

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

Small 173 KB PDF named dos vas, a short and uninformative title that most likely refers to a dual VAS layout, the voltage amplifier stage of a class AB power amplifier.

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.

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

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.

Schematic in PDF form for a BCi 450 W amplifier, marked 2R and dated 2013 according to the file name.

PDF schematic labelled BCi with the year 2012, most likely an amplifier design from the same family as other BCi drawings, though the name itself states no power rating…

Circuit diagram for a bass extender project, with the name pointing to EPE, which typically refers to Everyday Practical Electronics magazine, and the May 2007 issue.

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

PDF schematic of a 150 W amplifier, marked as a new version and converted from another file format, judging by the name.

Compact 311 KB PDF schematic whose name suggests a bipolar transistor design, probably an audio amplifier, though the label 5_5bipolar_msg is cryptic and gives no brand…

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

Schematic in PDF form for a tone control board labelled NEWGEN TA2411B, where TC most likely stands for tone control.

Small PDF document for the STK412-150, a Sanyo hybrid power amplifier module used in many home audio systems and mini hi-fi units.

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

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

PDF amplifier circuit built around the Sanyo STK412-170 hybrid module, rated at 180 W in the name, which also marks it as OK, presumably a verified design.

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…

Scanned PDF of the September 2006 issue of AudioXpress, the audio electronics magazine, filed here under schematics.

Very small PDF schematic named only 4kw2, probably a second sheet or variant of a 4 kW power amplifier design, though the name gives no further detail.

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

PDF schematic for an active subwoofer project designated PSW500, a 284 KB document credited to Rat Net, whose name describes it in Spanish as an active subwoofer.

Scanned book titled Programming Microprocessors by W. M. McMurran, dated 1977, provided as a 13.4 MB PDF.

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

Small 73.4 KB PDF for the Sony KD-43XH8005 television, referencing part number 1-002-850-31 and YS9S049HNG01, and labelled EMMC.

Updated schematic for the IRS D900 class D amplifier, rated from 200 to 500 W and credited to Rat Net, in a 423 KB PDF.

Generic file named index2, a very small 20.9 KB PDF catalogued as a schematic. The name reveals nothing about the device, brand or board, so open it and identify the…

Schematic PDF of 50.8 KB with a generic messaging-app style name that gives a date-like code but no model, brand or board detail.

PDF exported from a CorelDRAW file for a Zener stereo amplifier rated 400 W, 642 KB in size; the Spanish name says it comes without the circuit diagram.