Video Switch for Intercom System Circuit diagram:
Along with a video switch, the circuit includes a video amplifier that
has been used with good results in many other Elektor projects, which
allows the brightness and the contrast to be adjusted separately. This
amplifier is included because the distance between the street and the
house may be rather large, so it is helpful to be able to compensate for
cable attenuation in this manner. The switch stage is built around the
well known 4060 IC, in which switches IC2a and IC2d alternately pass
one of the two signals to the output. They are driven by switches IC2b
and IC2c, which generate control signals that are 180 degrees out of
phase. The switching rate for the video signals is determined by a
clock signal from an ‘old standby’ 555 IC, which causes the signals to
swap every 2 seconds with the specified com ponent values.
Naturally, this circuit can also used in many other situations, such as
where two cameras are needed for surveillance but only one video cable
is available.
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