A/V 4 CHANNEL SWITCHER WITH RELAY TX SWITCH
I had a requirement to switch several video and sound sources to be simple and operate via push buttons.
I decided that 4 channels would be enough but must have adjustable video level on each channel.
buttons 1 to 4 have each got a LED above them.
The sound chip used was a CMOS 4066 analogue switch.
The video chip used was a TEA 5114 that I have used before on GB3XG 10GHz repeater Bristol and functions well.
Note the unusual Logic level for the 5114 is 3.3 Volts I used a series "R" and a "ZENER".
The unit operates from a 12V supply and sub regulates down to 5 volts for the logic chip a MACH series chip.
I also added a sound MUTE LED and button and a power on LED.
A single pole changeover relay contacts come out to a terminal both N/O and N/C
The complete 4 channel Audio Video switcher PCB