Video Router Term

The video router acts like a switcher, which is a switchboard for video signals used for transporting or routing video signals, from one place to another (from inputs to outputs). In a video router, the number of inputs and outputs varies dramatically, which means the number of input routers usually explained by the number of outputs e.g. 2×1, 8×1, 256×256.

Video Router Crosspoints, Inputs and Ouputs

Internally, a video router configured as a number of crossing points that can be enabled to pass signals in accordance with the desired output. This is based on one input can be routed to any output.

Signals and Control Panels

Transported signal type can be anything from analogue composite video signals of PAL, NTSC, Analogue component and for digital such as SDI, HD-SDI. Broadband routers can also be directing more than one type of digital video signals such as SDI and HD-SDI.

You can find many types of control panels to regulate video routers in use today, such as via the RS242, or IP.

Audio Video Router/Switcher Circuit

Here is an audio video router (switcher) is configured for 8-input x-output, which is controlled from a computer, such as from parallel or serial port. EACH audio / video output can be switched to any of the eight inputs, separately.

The circuit uses 5VDC as VCC and-7VDC as VEE. The video inputs are terminated to GND by 75 ohm resistors.

Audio Video Router Circuit Diagram

Audio Video Router/Switcher Schematic

One module drives one audio video output and has a 34-pin connector to plug into the system interface. You cans use video OPA-s on the 4051 output instead. (Designed by Peter JAKAB). That note you cans get full integrated video multiplexers from Maxim for best audio video router.

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If you want to link video and audio signals to a TV receiver, it cannot only via the AV cable, you can use an video audio sender. This wireless gadget you can buy them online at amazon, AV sender is priced around $ 75 – $ 120. This is to eliminate the limitation of cable length when using the AV cable.

Video audio sender generally consists of a modulator which modulates the video and audio at a certain frequency and then mixing this signal to be included on the carrier frequency and transmits via a small antenna. This frequency band could be on VHF or UHF channels, so you can find it on the TV channel. As a source of video and audio can be used a VCD / DVD player, CCD Camera and others.

Video Audio Sender Block Diagram

Here is an video audio sender that uses a simple transistor circuit. Wireless video audio sender is sourced from the internet site for educational purposes. Maybe some of the hobby wanted to know how a block diagram of an audio video sender or a simple block diagram of a TV transmitter.

Wireless Video Audio Sender Circuit

Video Audio Sender Circuit Schematic

This video audio sender or transmitter works on UHF channel. As in the TV transmitter systems, the audio generated by FM modulation with a frequency of 4.5-6.5 MHz and Video in AM. Audio modulation is performed immediately following the carrier frequency, and the video is inserted through Emittor of the transistor mixer.

Video Audio Sender Circuit Analysis

Q3, VC1, C13, C16 and L3 all make up a Colpitts oscillator circuit that fluctuates from 220~250MHz. You can regulate the frequency to any value within this threshold by tuning VC1 or L3. C13 modulates the signal rate. When the capacitance increases, so does the modulation. R9 and C16 bias the local oscillation. If you lower R9′s frequency to 680W the oscillator’s output level will increase.

Q2 and L2 act as a frequency doubler. C7, along with FCZ7S3R5 (IF transformer), the Q4 transistor, C14, C19 and R12 all make up the mixer. This mixer takes both audio and visual signals together and “mix” them into one and passes through RF Amplifier Q1 to transmit the signal to the antenna.

Wireless Video Audio Circuit Testing

• Turning the blue component’s trimmer on VC1 varies the frequency. When we turn the trimmer, the television’s channel has to be changed accordingly. It is easier to tune the AV Sender if you have a spectrum analyzer to help you find the correct frequencies. If the frequency is tuned to 474 MHz then this would be the equivalent of your TV’s channel 14 UHF band.
• The IF transformer is used to synchronize the audio and video frequency’s level radio. If the TV’s image is too blurry then you can adjust the IFT to fine-tune the image.
• SVR1 controls the video signal input ratio, while SVR2 controls the audio portion. You can tune these components according to your needs. Keep best tuning the signal with the quality video audio sender.

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Often when we intend to copy over a video cassette, the results obtained have audio and video quality is poor. This is usually because of the low gain of the audio and video that go into the recording process. For that reason, an equipment which can be up and drop off gain is commonly called the audio video amplifier.

Further by the amount of equipment in the home entertainment center can result in the need for audio and video gain will vary. In order to properly manage those needs you can buy an audio video amplifier is about $ 50 even more expensive because of the development of digital technology in the field of audio and video.

However, our direction is not up to much there, only limited to the need to strengthen the analog signal, that is an analog audio video amplifier. The following AV amplifier circuit aims to suit the needs of the gain for the recording preparation, and several output channels that can be used for other purposes if necessary.

Audio Video Amplifier Circuit Diagram

This simple audio video amplifier circuit is especially helpful when used in conjunction with universal descrambler and stabilizer circuit to make copies of video tapes. We are not only allowed to have the ability to fine tune the strength of the video was also helped transform and enhance the audio recordings are usually to be poor.

Circuit operation is straight forward for amplifier circuits. It was built using the audio IC 5532 (dual channel) and for strengthening the video signal using the IC CA3100. When you want a channel stereo to amplifier audio comprises same components except another part IC1 used. Pin 6, 5 and 7 is the input is the output.

Audio Video Amplifier Schematic

Audio video amplifier circuit is a very basic, but sometimes electronic hobby is something fun for some people. Through this circuit, You may express curiosity about the analog audio video amplifier.

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Here is a switching power supply schematic using an IC power step-down switching regulator L296 (P), which can deliver currents in voltage 20V 4A. The output voltage can be adjusted within the range of 0V to 40V. You can quite easily build this switching power supply circuit.

You can see more clearly in the switching power supply schematic, a diagram of the IC pin on pin 12, 13, and 14, there is configuration Reset Input, Reset Delay, and Reset Output. So you actually do the design details for power supply circuit into a programmable power supply by using the microprocessor.

In addition to the above features including soft start, thermal protection, remote inhibit, and a PWM comparator input for synchronization in multichip configurations. (see L296 datasheet).

Voltage and current limits on the power switching regulator can be adjusted. In the switching power supply schematic below is in P3 and P2 for voltage regulation, P1 for limiting the current. While Efficient operation at switching frequencies up to 200 KHz allows a reduction in the size and cost of external filter components. You can adjust the switching oscillator frequency of the switching power supply schematic in C1 R4 (around 208 KHz).

Switching Power Supply Schematic

Switching Power Supply Schematic

You should take special care when purchasing to choke. Its ferrite material should be built for frequencies up to 300kHz. Input to the regulator can be DC or AC voltage because the input is the rectifier bridge. See the type of choke in the switching power supply schematic.

Read more about Programmable Power Supply – Variable DC Power Supply Circuit.

Power supply is one tool that should be available whenever needed to operate a DC application. You are just starting to wreak hobby power supply, may be trying to build one from a DC power supply schematic.

The availability of a variable or adjustable DC power supply schematic meant to be built for a power supply which can freely choose the required voltage configuration. As it was owned by a laboratory power supply with the voltage features that can be changed and has a current-limiting.

Full features of a power supply are also added to the monitor panel for voltage and current protection circuit coupled to prevent damage in case of overvoltage and / or short-circuit. However, in the following DC power supply schematic is a simple power supply output voltage is built with features that can be adapted according to your needs.

DC Power Supply Schematic

Adjustable DC Power Supply Schematic

DC power supply schematic is divided into two parts, namely unregulated power supply and regulated power supply, which is contained in the printed circuit board (PCB). Unregulated power supply is a DC power supply is used as a source for the voltage regulation on the regulated power supply. So the DC power supply schematic is a basic diagram of the step-down DC to DC Converter.

Adjustable DC Power Supply-Component Layout

The output voltage of the adjustable DC power supply is variable with voltage range from 1.3V to 22V with maximum current 1A. 2K potentiometer P1 is used to set the desired output voltage. While R2 is marked by the dashed line, can be enabled with disabled P1, with the aim of the homework for you to know more about how to use a voltage divider to determine the output voltage at a variable power supply. So this power supply can be modified into a power supply with fixed voltage at the output.

Adjustable DC Power Supply-PCB

You can understand about the voltage divider formula in the previous article power supply and see DC power power schematic that uses a LM317 IC (T) as a voltage regulator IC. The use of a diode D1 as a reverse polarity protection while P1 sets the output voltage of the DC power supply schematic.

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