either at pin 4 or 5 depending on which camera is selected pin 1 will select the appropriate input based upon the signal from pin 5 of q 4 of the camera selection block the input will then be transmitted to the non inverting leg of the amplifier where it will be amplified and transmitted to the lcd as video for display one may also implement a variety of different bypass capacitors and resistors to obtain the desired gain one type of configuration may be seen in fig2 lead 3 from j 2 of the lcd is connected to ground and lead 2 from j 2 of the lcd is the video return lead which transmits the video back lead 4 of j 10 or j 12 depending on which camera is selected the power video cb 2 also communicates with the bullet camera heater amp sensor and the night camera heater amp sensor as seen in the functional block diagram fig2 a more detailed description of the heater sensor may be seen in fig2 this circuitry compares the onboard temperature to the outside temperature the main power supply is routed to both the day and night camera heater and sensor circuitry as seen in fig2 both circuitries may be identical and for the purposes of brevity only the day camera circuitry will be.