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Single ended signal transmission in c/askelectronics@discuss.tchncs.de
Single ended signal transmission in c/askelectronics@discuss.tchncs.de
[โ€“] [S] 1 point 11 months ago

I like the use of the rj45 because it is cheap, easy to assemble and reliable. The plugs won't be accessible to the end user unless they open up the device so hopfully they won't fry anything.

Ultimately I will just have to try and see what works and what doesn't.

Thank you for your reply ๐Ÿ˜Š

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    • Single ended signal transmission in c/askelectronics@discuss.tchncs.de
    7
    Single ended signal transmission (lemmy.world)
     

    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

    Charged supercap with reverse polarity in c/askelectronics@discuss.tchncs.de
    10
    Charged supercap with reverse polarity (lemmy.world)
     

    Hey!

    I have made a 24v supercapacitor bank which is made of 12 2.7v 20F supercapacitors, balancing resistors, charge resistor and a diode to bypass the charge resistor when in discharge mode.

    The mistake was made when it was connected to a mean well LRS-100-24 which is a 24v 100W supply. When I powered it up the other control board was starting and stopping - the power supply was current limiting. Im not sure what voltage would have been applied to the supercapacitors but I think it wasn't high as the microprocessor on the other board was constantly resetting so the supercaps were not charged.

    This happened for a maximum of 60s until I realised what was wrong and disconnected the caps.

    My question is - will the capacitors be damaged from this event? Any help is very much appreciated.

    Thanks

    It's too hot! in c/aww@lemmy.world