50 Watt Amplifier

This is a handy, easy to build general purpose 50 watt amp. The amp has an input for a radio, TV, stereo or other line level device. It also has a phono input for a record player, guitar, microphone or other un-amplified source. With the addition of a low pass filter at the input, it makes a great amp for a small subwoofer.

Schematic

Parts List

R1 ....................... 200 Ohm 1/4 W Resistor
R2 ....................... 200K 1/4 W Resistor
R3 ....................... 30K 1/4 W Resistor
R5 ....................... 1K 1/4 W Resistor
R6 ....................... 5K 1/4 W Resistor
R7,R10 ............... 1 Meg (5%) 1/2 W Resistor
R8,R9 ................. 0.4 Ohm 5 W Resistor
R11 ..................... 10K Pot
R12,R13 ............. 51K 1/4 W Resistor
R14 ..................... 47K 1/4 W Resistor
C1 ....................... 100uF 35V Electrolytic Capacitor
C2 ....................... 0.011uF Capacitor
C3 ....................... 3750pF Capacitor
C4,C6 ................. 1000pF Capacitor
C5,C7,C8 ........... 0.001uF Capacitor
C9 ....................... 50pF Capacitor
C10 ..................... 0.3uF Capacitor
C11,C12 ............. 10,000uF 50V Electrolytic Capacitor
U1,U2 ................. 741 Op Amp
U3 ....................... ICL8063 Audio Amp Transister Driver thingy
Q1 ....................... 2N3055 NPN Power Transistor
Q2 ....................... 2N3791 PNP Power Transistor
BR1 .................... 250 V 6 Amp Bridge Rectifier
T1 ....................... 50V Center Tapped 5 Amp Transformer
S1 ....................... SPST 3 Amp Switch
S2 ....................... DPDT Switch
F1 ....................... 2 Amp Fuse

SPKR1 ................ 8 Ohm 50W Speaker

MISC ................... Case, Knobs, Line Cord, Binding Posts Or Phono Plugs (For Input And Output), Heatsinks For Q1 And Q2

Source: http://english.cxem.net/amplifier/amplifier5.php

Power Amplifier MOSFET 100W with IRFP240

MOSFET amplifier with MOSFET for your build in electronic hobby.
I would like to show you here a basic MOSFET amplifier or power Amp which Output power is plus/minus 100 Watt/RMS with
8 Ohms or ohter plus/minus 160 Watts /RMS with 4 ohms.
Regarding this circuit simplicity, The distortion is plus/minus 0.1 %.
For band-width -3 db(decibel) is gain for 4 Hz to 96 Khz, it is limited by C1, R1, C2 and R2.
In the two transistors are T1 and T2 makes a first differential stage part, So,current source(I) of +/- one mA is set with resistor R3.


For the upgraded project, The current source(I) is more efficient in stability. Coil P1 allows a fine tuning of direct current voltage at amplifier’s output. Place the Coil P1 with it’s half value for first power up, then turn it slowly for a lowest DC output voltage. Use a first quality compoment.

Electronic Part

C1 = 2,2 µF MKP, MKT 100 V
C2 = 330 pF céramique 50 V
C3 = 100 nF MKP, MKT 100 V
C4 = 100 µF 40 V électro-chimique
C5, C6 = 18 pF céramique 50 V
C7 = 100 nF MKP, MKT 250 V (C8 = 47 µF 100 V)
R1, R3 = 47 K (R3 = 330 -> 470 Ohms)
R2 = 2K2
R4, R5 = 3K9
R6 = 1 K
R7 = 27 K
R8, R9, R11 = 100 ohms
R10 = 10 K
R12, R13 = 470 ohms
R14, R15 = 0.33 ohms 5 watts
R16 = 10 ohms 3 watts (R17 = 1 K R18, R19 = 10K)
T1, T2, T9,T10 = 2SD756A,2SD716A, BC556B (attention au brochage différent – take care for pin layout)
T7 = IRFP240, 2SK1530, 2SJ162, BUZ900DP, BUZ901DP (attention au brochage different – take care for pin layout : GDS GSD)P1 = 100 ohms (25 tours – 25 turns)

Source: http://www.free-circuit.com/power-amplifier-mosfet-100w-with-irfp240/

FM Voice Transmitter

Additional Notes

The default for the capacitors type is ceramic, preferably the npo 1% type or equivalent. But basically nothing critical here. Use any capacitor you have laying arround, but NO electrolytic or tantalum caps. Only if you intend to use this circuit outside the home you may want to select more temperature stable capacitors.

To find the signal on your receiver, make sure there is a signal coming into the microphone, otherwise the circuit won't work. I use an old mechanical alarm clock (you know, with those two large bells on it). I put this clock by the microphone which picks up the loud tick-tock. I'm sure you get the idea... Or you can just lightly tap the microphone while searching for the location of the signal on your receiver.

Source: http://english.cxem.net

A 12 Mega Pixel Camera On Its Way

The mega pixel war in mobile phones is in its full swing, with every mobile manufacturer trying to incorporate a better numerical figure in its mobile phones. All the leading brands, be it Nokia, Sony Ericsson, LG, Samsung or Motorola, all have entered into this mega pixel war. The most recent 8 MP camera phones are now dominating the market, with Sony Ericsson C905 Cyber Shot, Samsung Innov8 and LG KC910 being in the forefront. The year 2008 saw a surge in 8MP camera phones.

Come 2009 and we may witness the emergence of a 12 mega pixel camera phone. Doesn’t that sound quite interesting? News is pouring in that Sony Ericsson is working on its new phone that would feature a whopping 12 mega pixel camera and would probably hit the market in 2009. First it was a 2 mega pixel Cybershot K750i, then K850i with a 5 MP camera and then C905 with an 8.1MP camera with xenon flash. And now, a 12MP successor to C905 Cyber Shot.

Sony Ericsson, for the time being, has codenamed it ‘Kokura’ and it is likely to feature a full touch screen, similar to the Apple iPhone interface. It would perhaps be based on the TI3240 chipset with S60 interface and Symbian OS version 9.4. The grapevine is abuzz with the news of another cyber shot phone from Sony Ericsson, codenamed ‘Yurika’, which would apparently be a message based phone. It would feature access to YouTube, Yahoo, Facebook, etc. Since it is supposed to be a message centric phone, it would likely come with a slide-out QWERTY keypad and would bear resemblance, in features, to the ‘Kokura’. Opting out of the memory sticks, this phone would come with SD card storage. It would perhaps lack a 3.5mm headphone jack and standard mini or micro USB socket.


Samsung too seems to be working on a 12MP camera phone. More instantly, it is heard that it is working on an 8MP module with 3x optical zoom. With a proper zoom and lens, you can definitely do away with your compact digital cameras.

All said and done, if rumour mills are to be believed, Sony Ericsson’s inspirational 12 MP camera is in progress and there is not much we can do for now, than to sit with bated breath for its release. What the future holds, only time can tell.

Source: http://www.mobilephonereviews.org

Samsung Pixon M8800 Mobile Phone

Samsung is a growing global brand manufacturing digital TVs, memory chips, mobile phones and TFT-LCDs. With innovation at its core, Samsung unveils world’s slimmest full touch 8 mega pixel camera phone. It follows hot on the heels of the Samsung i8510 and is called ‘Pixon’, the pre market name being ‘Bresson’. This mobile phone outshines LG KC910 that was believed to be the slimmest 8MP camera phone.

Samsung Pixon M8800 Bluetooth Mobile Phone flaunts a 3.2” full touchscreen with 240 x 400 pixels, 262k colour WQVGA TFT LCD. It has a landscape virtual keypad and office document viewer. The phone is surely slim with the dimensions of 107.9 x 54.6 x 13.8 mm (H x W x D).

Incredible imaging features

This phone is equipped with an 8 mega pixel camera with 16x digital zoom, auto focus, fast shutter, face detection, dual power LED flash and geo tagging. The geo-tagging feature provides the exact latitude and longitude of the place where the image was shot. The other remarkable features of the camera are ASR (Advanced Shake Reduction), WDR (Wide Dynamic Range), smile shot, auto panorama shot, photo memo and an integrated photo browser for photo sharing and viewing.

Samsung Pixon M8800 8MP Camera Mobile Phone supports video recording and playing. It can record upto 30 fps D1 (720 x 480) and 120fps (QVGA) high quality video. It also supports slow motion video playing. This phone comes with SRS - Surround Sound System and virtual 5.1CH.

Entertainment aplenty

This phone comes loaded with a music player that supports MP3, AAC, eAAC, eAAC+ and WMA formats. It also comes with integrated FM radio with RDS, DNSe (Digital Natural Sound engine) and DivX playback supports.

Connectivity

This mobile phone provides connectivity via Bluetooth, USB and TV out. It operates on Quad band GSM standards and uses GSM, GPRS and EDGE technologies for data download. Here, it comes with HSDPA 7.2 that ensures incredible download speeds. It has a 200MB internal memory and also comes equipped with a microSD card memory expansion slot. Samsung Pixon M8800 Mobile Phone is undoubtedly leading the way in camera and phone convergence.

Source: http://www.mobilephonereviews.org

Samsung M8910 Pixon12 Mobile Phone

Samsung, one among the top five mobile brands in the international market, has released a 12MP camera mobile phone. With the announcement of this hi-end monster, Samsung has enrolled themselves as an active participant in the megapixel war going on between the major players!!! Sony had announced the Sony Idou Mobile Phone which is renamed as Sony Ericsson Satio Mobile Phone few months back itself. However it was released only on May 29th 2009. Samsung has managed to release their competitor in a couple of days after the launch of Idou. LG has also announced the release of their 12MP model in 2009 itself. With the whistle blown for a neck to neck 12MP competition, we can expect more and more innovations from the leading brands. Let us have a peep into the remarkable features of this smart 12MP Pixon handset.

Samsung M8910 Pixon12 Mobile Phone can be categorised as an upgrade of the Samsung M8800 Pixon 8MP Camera Mobile Phone. The mobile pundits speculate that this mobbie is the outcome of Samsung’s “one to one strategy” with Sony Ericsson Satio. It is reported that this brilliant handset will be released in Europe in June 2009. The design is compact and quite appealing with 3.1” AMOLED touchscreen. With more than 16k colour reproducing capability, one can enjoy the pristine images in this phone. One need not worry about the compatible multimedia format of this hand-held. It supports almost all possible multimedia files, and also comes with a TV out to ensure the best viewing experience for the users at their comfortable place. It is a quad band 3G Mobile Phone with around 150MB internal memory. However, the users can beef up the memory upto 16GB by adding the expandable memory cards. GPRS, EDGE, Wi-Fi, Bluetooth.. one will get all these major network connectivity options in this smartphone to ensure faster and easier data transfer.

12MP Camera is one of the major highlights of this mobile phone. Camera functionalities include touch based focus that helps to focus on the required object with a single tap in the screen and fast saving option that helps you take another snap in a split second. 28Mm wide angle lens and the powerful xenon flash makes it more or less like a professional 12MP digital camera!!! It will be of great help for the photomaniacs or also for the globe trotters as they need not carry a separate digi-cam to capture the landscape or memorable moments. This camera is a genius while shooting the video too. It offers a 720 x 480 pixel resolution at 30fps while capturing the videos.

The faster connectivity options like 3G, Wi-Fi, etc helps the user to upload the images in the social networks like Flickr, Facebook, photobucket, etc. almost instantaneously. One need not stick on to the same old songs in the MP3 playlist. One can also tune in to their favourite radio programmes with the help of built-in FM Radio. The organiser and UI is quite user friendly and is much simpler compared to other high-end Samsung models. It is also reported that this phone comes with dual band UMTS/HSPA and GPS facilities as well. This newbie measures about 108 x 53 x 13.8 mm, and is on the heavier side with 120 grams.

Source: http://www.mobilephonereviews.org

IMate JAQ-3 Mobile Phone

I-Mate has introduced a mobile phone with lots of innovative features in it. The features in this mobile phone will make every one to get attracted to it. It is the new IMate JAQ-3 Mobile Phone. This is not just a mobile phone but can rather be called as the pocket computer. This has got the operating system of Microsoft windows mobile 5.0 pocket PC edition (Magneto) AKU 3.2. The operating system kernel of this unit is Windows CE 5.1.422.

Central Processing Unit

The central processing unit of this unit is the Texas Instruments OMAP 850. This could browse all the information’s according to the instruments of Texas. The Data bus width in this unit is measured as 32 bit in width. The Central processing unit clock has a speed of 201 MHz. The central processing unit is ARM926EJ-S. This is made assembled with a level 1 cache memory of 8 KB data cache/ 16 KB instruction cache. The instruction set of this unit is ARM v5.

Memory and Display

The random access memory of this unit is of flash ROM. The ROM capacity is 128 MB. The RAM installed in it is under the technology of SDRAM. The RAM capacity is estimated as 64 MB. The display type of this i-Mate JAQ-3 Mobile Phone is the colour transflective TFT display screen. The display colour depth is 16 bit / pixel with 65536 scales. The display resolution of the screen is 320 x 240 pixels. Its diagonal is calculated as 2.4 inches. The viewable area is 2” x 1.5”. The dot pitch in this screen is 0.155 millimetre / pixels. It is a touch screen with QWERTY keyboard, 5 way directional pads and a scroll wheel.

Audio

The audio system of this i-Mate JAQ-3 Mobile Phone is stereo audio, with 16 bit audio sampling. A microphone and a loud speaker with mono type output id also supported. The audio output is 2.5mm.

Other Features

This IMate JAQ-3 Touch Screen Mobile Phone comes under the network frequency of GSM 850 MHz, GSM 900 MHz, GSM 1800 MHz and GSM 1900 MHz. The standards of this unit are CSD, GPRS, and EDGE with an internal antenna. The ring tone supporting of this unit is 64 chord melodies. Vibrating alert, speaker phone is been featured. The SAR value of this mobile phone is 0.856W/kg taken over a volume of 10 grams and the phone controller of this unit is TI TMS320C54x.

Interface

The expansion slots that this unit has got are SDIO, MicroSD and TransFlash. It has serial (UART) RS-232, 115200bit/s. USB connector series of mini-B. Infrared gate and Bluetooth connectivity is also been included. A wireless LAN (Wi-Fi) of standards 802.11b, 802.11g (54Mbit/s) is also supported.

Camera

A camera with CMOS sensor 1.92 pixels that supports an optical zooms of 1x is integrated in this new mobile phone. The image formats are recorded in JPG or BMP file formats. The recordable video formats supported are 3 GPP and MPEG4.

Battery and Dimension

The battery technology used in this device is lithium ion with the capacity of 1200 mAh and an average current of 120 mA. The estimated life is 10 hours. The dimensions of this i-Mate JAQ-3 Mobile Phone are 67.5 x 126 x 14.5 mm and weight is about 160 grams.

Additional features

• GPRS Class 10
• Hands-free
• Voice command
• Built-in antenna

Source: http://www.mobilephonereviews.org

IMate PDA-L Mobile Phone

I-Mate is a company introducing numerous models of mobile phones to the market. As on an account, it has now introduced the all new IMate PDA-L MobilePhone. The screen made featured in this unit can access 65,536 colours, with a resolution unit of 320 x 240 pixels. This screen could recognise hand writing too, so that the task of typing becomes easier than the earlier. The frequency band of this mobile phone ranges as GSM 850, GSM 900, GSM 1800, and GSM 1900. This comes under the quad band frequency. The memory for the phone book is been shared.

FEATURES

• This i-Mate PDA-L Mobile Phone has got the feature of vibrating alerts that alerts you for the incoming calls and messages.

• An alarm clock that makes you set the time.

• Games in this mobile phone can be downloaded.

• In the case of ring tones it has got the ability of playing polyphonic ring tones, MP3 ring tones and downloadable ring tones too.

DATA INFORMATION

This mobile phone has got the operating system of MS Windows Mobile 5.0 and 200 MHz processor. Talking about the messaging features, it has got MMS, SMS, IM and Email. The browser program that this unit has got is the pocket IE HTML & WAP 2.0 / xHTML. This has got the ability of accessing GPRS, for fast accessing the technology EDGE is been employed.

MEMORY

The internal memory that this mobile phone has got is 128 MB ROM and 64 MB RAM. The memory slot of this mobile phone is the micro slot SD (TransFlash).

CONNECTIVITY

This i-Mate PDA-L Mobile Phone is made featured with Wi-Fi technology; it is the IEEE 802.11 b/g. This has both infrared and Bluetooth connectivity options. In the case of Bluetooth it is v1.2. A universal serial bus connectivity is been provided with this mobile phone. PC synchronization can be made with this unit.

CAMERA

The digital camera of this unit built in, that could record videos too. The resolution of the camera is 1600 x 1200 pixels. This is about 2 mega pixels. Voice recorder and video player is also been featured in it.

MUSIC PLAYER:

In the music player integrated in the device you could play AAC and MP3 files.

Source: http://www.mobilephonereviews.org