Hi,

I know very little about electronic and electricity, and would like to know if it is possible to make a HDMI switch (one input and several output) which has 20 pins (if I'm correct) with five MC74HC4066A chips ( quad analog switch ) and a rotary switch for output control. I know nothing about HDMI voltage etc,... Are all the pins OK to go through these chips ?

 

Did you check the switching speed of 74HC4066?

 

know nothing about HDMI voltage etc,..

Why not just buy an HDMI switch box? I bought one on Amazon; 3:1 with a remote control for a few dollars with free shipping.

 

Did you check the switching speed of 74HC4066?

No, it only says "Fast Switching and Propagation Speeds" in this document : https://www.onsemi.com/pub/Collateral/MC74HC4066A-D.PDF

 

Why not just buy an HDMI switch box? I bought one on Amazon; 3:1 with a remote control for a few dollars with free shipping.

I like to make my own things

 

I like to make my own things

I do to but, at some point, you have to make a make vs. buy decision.

If something costs a few dollars, it's not worth my time. I'm retired and have a lot of discretionary time, but that doesn't mean I'm going to waste it trying to build something that won't have the fit/finish of something I can buy for little money.

 

Check out the speed requirements for HDMI.

Version - Character Rate
1 - 165MHz
1.3 - 340MHz
2 - 600MHz
2.1 - 1200MHz

Now compare that with the bandwidth of the 74HC4066A, 150MHz.
It is on the first line of page 5 on the pdf you posted.

 

Check out the speed requirements for HDMI.

Version - Character Rate
1 - 165MHz
1.3 - 340MHz
2 - 600MHz
2.1 - 1200MHz

Now compare that with the bandwidth of the 74HC4066A, 150MHz.
It is on the first line of page 5 on the pdf you posted.

Thank you for answering me, if I understand you correctly it's not possible to do so because of the bandwidth, I guess HDMIv3 will also need more speed..
It's not very clear to me what is bandwidth and what is "switching speed"..

 

Switching speed is the time it takes to turn on/off the multiplexer gate.
In this design not an issue because its driven by a human operated
switch.

This part is not characterized for RF performance, eg. 50 Mhz or greater.
Like isolation ( signal feedthru when off), cross channel coupling (coupling
of one channels signal into another due to parasitic C).

Stuff you have to consider when working with high frequency signals -

https://en.wikipedia.org/wiki/RF_switch

To do this properly you would have to layout on a PCB in order to
aid in isolation, crosstalk, phase shift......

Bandwidth is generally discussed as the point, in frequency, when an
amplifier or signal path drops its amplitude by ~ 3 db (decibels).


Regards, Dana.