Electronics > Beginners
Troubleshooting; finding cause of 35MHz signal
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boB:
Try tacking a small capacitor (0.1 uF ?) RIGHT across the Vcc to GND of those ICs and see if it helps.

You could also add a ferrite clamp around the cable exiting the board which I think is where you said the interference starts.

That ferrite would want to be RIGHT CLOSE to the board with the ICs on it to keep the wires exiting from emitting.
permal:

--- Quote from: boB on January 07, 2019, 08:09:13 pm ---Try tacking a small capacitor (0.1 uF ?) RIGHT across the Vcc to GND of those ICs and see if it helps.

You could also add a ferrite clamp around the cable exiting the board which I think is where you said the interference starts.

That ferrite would want to be RIGHT CLOSE to the board with the ICs on it to keep the wires exiting from emitting.

--- End quote ---
I'll give the cap an attempt. A ferrite clamp I'd have to buy first; any suggestions?

As to *where* the interference starts, I don't really know. It appears on the first high-low edge when the keypad sends the signals and only when the keypad is connected - manually pulling the same line high/low works without problems.

Assuming the worst - that the cap/ferrite doesn't work - I've been looking at unidirectional level translators and the SN74LV4T125 seems to meet my requirements, thoughts?
permal:
A follow up on this:

I changed the two-way level translator to a one-way (SN74LV4T125) and things are now working :)
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