SIEMENS CCAS1415 LPO OtoFocus Kamera (Çalışmıyor) Tamiri nasıl yapılır.Şikayet olarak servisimize gelen kamera çalışmıyor diye gelmişti. Gözlemlerimizde elektrik gelmediğini fark ettim. resimde devresi görülen kamera beslemesi olup hem 12v dc hemde 24 volt ac voltaj ile çalışma özelliğine sahiptir. Bundan dolayıdırki kamera içerisinde extra bir smps devresi mevcuttur resimde görünen transistör ise smps devresini besleyen os. entegresinen beslemesini sağlamaktadır arızalı olduğu tespit edildi ve değiştirildi.

This HD TV UHF wideband amplifier(Ultra High Frequency amplifier) has a total gain of 10 to 15 dB in the 400 – 850 MHz domain frequency so it can be used where the tv signal is weak. For this UHF antenna tv amplifier to work correctly you need to cut the components pins as short as possible. C1, C2, C6, C7 are SMD type ( surface mounted ). This antenna tv amplifier or uhf wideband amplifier need to be build inside of a metal box and then connected close to the tv antenna. Prototype pictures (Prototip resimler) Antenna HD TV UHF band amplifier circuit schematic (Anten HD TV UHF bandındaki amplifikatör devre şeması) PCB layout for Wideband HD TV UHF Antenna TV Amplifier Circuit using transistor 2sc3358 (Baskı Devresi) The power supply is a simple 12V stabilized source. The antenna tv amplifier can be connected directly to the power supply thru coaxial cable of the tv antenna but you need a 10 – 100uH coil on the alimentation line. The tv set will be connected to the uhf amplifier thru a small coupling capacitor. Adjusting is easy, just bring the P1 to the middle and then adjust it untill you obtain the best tv image quality. Digital Tv antenna UHF amplifier components (Devrede kullanılan malzeme listesi): T1 -Transistor 2sc3358C1 – 10µF/35vC2,C9 – 1nFC3 ,C4 – 10nFC5,c6,c7,c8 – 10pFR1 – 470 OhmsR2 – 2.2 KR3 – 1KohmsP1 – 5KohmsL1,L2 – 2 turns 22AWG , 3mm Ø.L3,L4 – 10uH or 10 turns, 0.2mm Ø on ferrite..12 volts special power supply. 2sc3358 Transistörü kullanılarak Geniş Bant DTV UHF Anten TV Amplifikatör Devresi

If you are interested to build TV transmitter for your electronic project this Advanced TV Transmitter With Sound designed by Tetsuo Kogawa could be good idea for you. TV transmitter consists of of the two sections: video transmitter and audio amplifying. Both of them actually is transmitters. The main one generates video carrier while the smaller one generates the exact 4.5 (5.5 in some countries) MHz FM audio carrier. When it is supplied to the main section, the combination generates the audio carrier that is the total of the video frequency plus 4.5 MHz (this is the same in the US but different in other countries: 3.5 in the UK, 5.0 in Italy, 5.5 in Australia and so on: see the channel plans). The Audio section (1)Coil: The most difficult point is the coil. You can use any type of coil as long as it fits the inductance. But the size of coil for 4.5 MHz is quite large if you use usual type of coils. Here I will use Ferrite Troidal core that is made by Amidon Associates. Wind 0.2 ECW (enamel-coated wire) around the "FT-50-43" (Amidon) in 24 turns. (2)Transistor: You can use popular ones such as 2SC2001, 2SC1815, 2SC1907, etc. But you must keep the pins (E, C, B). How to adjust: Connecting the prove of the frequency counter at "#to the audio-in". Then adjust "Trimer cap. (80PF)" as the frequency counter shows exactly 4.5MHz. Sometimes, you have to add some capacitors (depending 100-1000PF) at the "E(mitter)" position of the transistor in order to adjust the frequency.

buz 11 ile yapılmış bir smps devresi