Audio-video switch
designed by Peter JAKAB
description
This is an 8-input x-output audio/video switch module to be
controlled from a computer, for example from the parallel port.
Each audio/video output can be switched to any of the 8 inputs,
separately. One module drives one audio/video output and has a
34-pin connector to plug into the system interface.You can use
video OPA-s on the 4051 output instead. Note that you can get
full integrated video multiplexers from Maxim.
Schematic diagram
WARNING: the drawing has been updated
and
- the video amplifier on the 4051 output is corrected
- the amplifier component values are shown
The circuit uses 5VDC as VCC and -7VDC as VEE. The video
inputs are terminated to GND by 75 ohm resistors.
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Peter's electronic projects