3 Channel Analog Video Splitter with Video Amplifier

  • Rajkumar Sharma
  • 1.408 Views
  • easy
  • Tested

If you need to drive multiple video gadgets or monitors from a single video signal source then this board is the right choice for you. This is a 3-channel video splitter with an amplifier and the circuit is built using discrete components. Q2 and Q1 act as a signal amplifier, Q3 act as output driver, trimmer potentiometer PR1 is provided to adjust the input signal swing, PR2 Trimmer is provided to set the gain of the amplifier, D1 is the power LED. The operating power supply is 12V DC and it draws 100mA current. RCA Connector J4 is the Video signal input, RCA Connector J1, J2, J3 provide the outputs. The default gain of the circuit is 4. The bandwidth is 5Mhz, input and outputs impendence are 75 Ohms. It is important to use all 3 channels at a time or change R11 to 150 Ohms if you will only use 1 x channel or 82 Ohms if 2 x channels are in use. Adjusting the board is very easy, just connect a voltmeter at the base of Q2 and adjust the PR1 so the voltage at the base of Q2 is 1V.

Features

  • Power Supply 12V Vdc
  • Current Consumption 100mA
  • RCA Connector for Video Input
  • 3 x RCA Connectors for Video Output
  • Trimmer Potentiometer for Gain Adjust
  • Trimmer For input signal Swing Adjust
  • On-board Power LED
  • PCB Dimensions 48.74  x 43.66mm

Schematic

Parts List

No.Qnty.RefDesc.Manufacturer SupplierSupplier Part No
11CN14 PIN MALE HEADER 2.54MM PITCHDIGIKEYS1011EC-40-ND
23C4,C5,C7100uF/25V ELECTROLYTIC CAPACITORNICHICONDIGIKEY399-6650-1-ND
32C2,C80.1uF/50V SMD SIZE 0805YAGEOYAGEO
42C3,C610uF/50V ELECTROLYTICNICHICONDIGIKEY493-5915-1-ND
51C1100uF/16V SMD SIZE 1210TAIYO YUDENDIGIKEY587-5426-1-ND
61D1LED RED COLOR SMD SIZE 0805OSRAMDIGIKEY475-1415-1-ND
71D21N4148 SMD DIODEMICROCHIPDIGIKEY1N4148UR-1-ND
81J1RCA JACKKYCON INCDIGIKEY2092-KLPX-0848A-2-R-ND
91J2RCA JACKKYCON INCDIGIKEY2092-KLPX-0848A-2-R-ND
101J3RCA JACKKYCON INCDIGIKEY2092-KLPX-0848A-2-R-ND
111J4RCA JACKKYCON INCDIGIKEY2092-KLPX-0848A-2-R-ND
122PR1,PR22.2K TRIMMER POTENTIOMETERBOURNSDIGIKEY3362P-1-222LF-ND
131Q1BC857 SMD SOT23-3NEXPERIADIGIKEY 1727-2924-1-ND
141Q2BC847 SMD SOT23-3NEXPERIADIGIKEYBC857BLT3GOSCT-ND
151Q3BD139STDIGIKEY497-12137-ND
161R18.2K 5% SMD SIZE 0805YAGEOMOUSER
172R2,R31K 5% SMD 0805YAGEOMOUSER
181R410K 5% SMD SIZE 0805YAGEOMOUSER
191R53.3K 5% SMD SIZE 0805YAGEOMOUSER
204R6,R7,R8,R1275E 1% SMD SIZE 0805YAGEOMOUSER
212R9,R13180E 5% SMD SIZE 0805YAGEOMOUSER
221R10470E 5% SMD SIZE 0805YAGEOMOUSER
231R1156E 5% SMD SIZE 0805YAGEOMOUSER

Connections

Gerber View

Photos

Video

BD139 Datasheet

cd00001225

PCB

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