this post was submitted on 13 Dec 2025
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Single ended signal transmission (lemmy.world)
submitted 5 days ago by TelepathicWalrus@lemmy.world to c/askelectronics@discuss.tchncs.de
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Hi,

I am thinking about the best way to transmit 5 single ended signals from one board to another as well as ground and 2 power rails. I was thinking cat5e cable with a standard rj45 plug but as cat5e is twisted pair I'm concerned about crosstalk.

The cable between the two boards would be a maximum of 50cm. 3 of the signals are addresses for a multiplexer that would change at a maximum speed of 2ms per change. One of the other signals is a 20khz pwm signal. The final signal is a zc detector for mains so max Freq of 100/120hz.

There may be high current switches at ac line frequency (50/60hz) near by.

Would single ended transmission with cat5e cable be okay for this or would I need differential signalling? If I need differential signalling, what sort of cable/connector could I use?

Any help is appreciated

Thanks

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[โ€“] dgriffith@aussie.zone 4 points 5 days ago (1 children)

The cable between the two boards would be a maximum of 50cm. 3 of the signals are addresses for a multiplexer that would change at a maximum speed of 2ms per change. One of the other signals is a 20khz pwm signal. The final signal is a zc detector for mains so max Freq of 100/120hz.

None of this will be a problem over 50cm of cat5. If you were talking about millivolt or MHz signalling then you'd have to be a bit more careful.

[โ€“] TelepathicWalrus@lemmy.world 1 points 5 days ago

Thank you for your response. I was hoping to run the power (3.3v and 24v) through the same cat5e cable. They wouldn't be high current, probably 100ma max. Do you think this would be ok too?

Thanks