Free Simple Circuit Diagram
For driving multiple video cables, the suitable component is LT1206 because it has low output impedance, 60MHz bandwidth and 250mA output current capability. But don’t forget about unterminated line effect when driving multiple cables. A crosstalk to other lines caused by a reflected wave is propagate back to the driver because the driver output is non zero impedance. Here is […]
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Installing the camera in office, home, or the shop becomes economically feasible because the price of security camera going down. It is not efficient if we provide a dedicated monitor for every installed camera. If the CRT monitor is used to display static image from only one camera, it might suffer phosphor burn. So we need video switcher circuit to […]
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Fading a video signal can’t be done simply by attenuating the composite signal, since the synchronization signal may drop below unacceptable level. Here a circuit to overcome the problem: Most of video signals will works with this circuit, except for very noisy or distorted signals. The rest circuit is an LT1251 video fader (U2) configured to fade the signal ranging […]
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Gamma correction need to be applied in video processing since the transfer function of video acquisition and video display is non linear. Here is the schematic diagram of a gamma circuit: If gamma value equal to 1, the the transfer function is linear. Typical CRT usually have gamma factor from about 2.0 to 2.4 in their transfer function. The effect […]
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