The circuitry couldn't be simpler. These switches are all Single Pole Double Throw (SPDT). Essentially the common side of the part is connected to the jack center pin, while the signal pins are connected to either the input or the output of the camera. The resistance of the switch is low enough not to cause much insertion loss or distortion to the waveform. Although this application shows switching a composite video signal, the same switch can switch the higher bandwidth component video signals or digital signals beyond 50 MHz as well. It is assumed that the internal video amplifiers have their own 75 matching resistors appropriately placed. The output Video amplifier needs to have a series 75 resistor and its dc level is 2.5 V. The input is assumed to be 75 with a dc path to ground. Since these switches are single supply, the signals passing through them need to be between 0 and 5 Volts with white level near mid-voltage. The dc blocking capacitor keeps undesired dc off the input or output. Figure 2 shows the use of these parts as described. Select pin is connected to an MCU, the inputs and output are connected to pins 4, 6 (4599) or 1, 3 (3157) and the jack is either connected to 5 (4599) or 3 (4599). Vcc is assumed to be +5 V. If a low voltage MCU is used as a controller, the NLAST4599 can be directly interfaced to it, as long as the supply voltage is greater than 2.3 V.