#BSS138

[jayakody2000lk]

5.1 channel preamplifier

This project introduces a digitally controlled 5.1 channel audio preamplifier system. This amplifier is specifically designed to increase the gain of the multi-channel PC sound cards.

The main reason for building this amplifier is the limited gain received from the ASUS Xonar AE sound card with the Creative Inspire T6300, 5.1 surround speaker system. Before switching to this soundcard, we had a Creative Sound Blaster Z card which provided good audio output with the above-mention speaker system. The key motivation of building this amplifier is to solve these gaining problems.

This preamplifier consists of six TL074/TL072 preamplifier stages and PT2258 electronic volume control. The input stage of this preamplifier consists of six TL074/TL072 buffer stages. The PIC16F886 microcontroller manages the PT2258 electronic volume control IC. All the volume levels and menu options are displayed on HD44780, 16x2 character LCD screen.

All the menu navigations and volume controlling can perform using a 5-pin, EC11 series rotary encoder. An additional push switch provides to mute and unmute the audio outputs.

The firmware of the PIC16F886 has been developed using Microchip's MPLAB XC8 toolchain. The provided firmware supports two volume control modes. In default mode, the user can control simultaneously control volume levels of all 6-channels. In the second mode, the user can control the volume of the individual channel. These volume control modes can select from the menu system.

The firmware can directly upload to the MCU through the ICSP terminal provided on the PCB.

The PCB of the preamplifier is designed as a double-sided board. Many of the components used in this PCB are in the form of surface-mounted packages.

We use a dual-line package for the PT2258 due to the difficulty of obtaining the SMD package.

The provided PCB design contains a preamplifier, buffer stages, digital volume control circuit, driver circuit, and power supply unit.

The recommended transformer for this circuit is 6V×2 (1A) step-down transformer. The given power supply circuit consists of three voltage regulators, including LM317, LM337, and L7805. Both the LM317 and LM337 regulators are configured to provide 4.5V dual-rail output.

The project was sponsored by PCBWay. The accurately configured PCB of this preamplifier can directly order from PCBWay through their website. The dimension of the PCB is 151.45 × 50.76mm. The video related to this article clearly shows the steps of assembling, flashing, and mounting this preamplifier.

As mentioned at the beginning of this article, we successfully tested this preamplifier with an ASUS Xonar AE sound card. This preamplifier provides significant and clean output with the above-mention sound card and speaker system. We construct our prototype build using a commonly available 230mm × 150mm × 84mm ABS project box.

This preamplifier is an open hardware project. All source codes, KiCAD design files, and compiled binaries are available at the GitHub project repository. The complete documentation of this project is available at the GitHub project wiki. The PCB can order from PCBWay. The PCB Gerber files are also available at the release section of the above GitHub repository.

All the schematics and PCB designs of this project are released under the terms of CERN-OHL-W version 2.0. The PIC16F886 firmware is released under the terms of the MIT License.

[yvin2wiss-blog]

Diodes Incorporated BSS138-7-F in Reel. N-Channel 50 V 3.5 Ohm Surface Mount Enhancement Mode Transistor SOT-23-3.

[mrk22krm]

Metal Oxide Semiconductor Field Effect - MOSFET, transistor is a semiconductor device which is used for switching and amplifying electronic signals in the electronic devices.

[polashislam]

[quartz-components]

BSS123 Logic Level N-Channel Mosfet

The BSS138 is an SMD Package (SOT23) Logic Level N-Channel MOSFET with drain current of 170mA and Drain Source Voltage of 100V. The MOSFET also has low threshold voltage of 1.7V typically. 

Know more about BSS138 MOSFET: https://components101.com/mosfets/bss123-mosfet-pinout-datasheet-equivalent

[liuxing168]

Newly acquired goods！ TLE7189F BTS724G

BSS138 IRF7240TRPBF

FF450R12ME4 IRS2092STRPBF

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SAK-TC265D-40F200W BB BTN8962TA TLE9260QX IPW90R120C3 IRF640NPBF IRLML9301TRPBF BC817-40

32 IRFB4227PBF IRF540NPBF BC846B IKQ75N120CH3 IR2110PBF SAK-TC234LP-32F200F AC TLE6250G TLF35584QVVS1 BCX56-16 BAS16 BTS723GW BAW56 BTS50055-1TMA IPW65R080CFDA IKW75N65ES5 IPD60R360P7SAUMA1 IPD70R360P7S AUIPS6041GTR BSS84

IPD50P04P4L-11 IRLML5203TRPBF IRF100B201 IRF7749L1TRPBF BSP752R IR2110STRPBF IRFR5305TRPBF IRFP4768PBF IR2110S BTS716G BTS6163D IPW65R041CFD BSC014N06NS BC817-25 TLE9263QX BTS6143D BTS5215L BC847C BSP75N IRFB4110PBF IPD90P04P4L-04 IRF3205ZPBF BTS5045-2EKA

IRFP4568PBF

1ED020I12-F2 BAT54

BCP56 IRF7341TRPBF

BTS711L1 IRFB4115PBF

IKW75N65EH5

IRF4905PBF BTS721L1 FF600R12ME4

IRF5305STRLPBF

BSP752T BTN8982TA

IRF4905STRLPBF

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[zuxinmuiyi]

BSS138 SOT23 New Original

BSS138 SOT23 New Original

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N€W BSS138 SOT23 New Original

[asaaki]

I got some signal MOSFETs for smaller level shifting between a 3.3V microcontroller and the 5V WS2812 LEDs. In the middle is a 2N7000 in TO-92 package (good for through hole soldering) and on the right side the BSS138 (only available as SOT-23, so I needed an adapter for breadboard testing). For comparison a quite chunky standard logic level shifter/converter (4 lines plus power/ground). Both types work like a charm. So it's time to create a new revision of my PCB for the coffee notification button. Yay! #mosfet #bss138 #2n7000 #logic #levelshifter #converter #microcontroller #mcu #esp01 #esp8266 #esp8285 #arduino #ws2812b #led #lights #control #electronics #tinkering #soldering #hardwareporn #embedded #hardware #iot #tiny #hobby (hier: Lichtenberg, Berlin, Germany) https://www.instagram.com/p/BuhTTQCh9LN/?utm_source=ig_tumblr_share&igshid=5kiy4xm3x349

[polashislam]

[asaaki]

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Hot air magic! ♨️💨🧙‍♂️ • Finally got to shoot this SMD reflow/rework soldering video. More details about the components in the previous post. • This is learning and practice until my new PCBs with lots of SMD pads will arrive. I've also ordered some low temperature paste to reduce the heat stress on the components. • #smd #soldering #tinkering #reflow #rework #hotair #pcb #mosfet #FDV301N #BSS138 #2N7002 #esp8266 #esp8285 #esp01 #ws2812b #neopixel #hardware #hardwareporn #electronics #maker #sunday #lazy #hobby (hier: Berlin, Germany) https://www.instagram.com/p/Bu1k038Hyk_/?utm_source=ig_tumblr_share&igshid=1oxzi7qurtd8f