From: liz@poppyrecords.invalid.invalid   
      
   Dan  wrote:   
      
   > I'm new to electronics and I'm hitting an issue beyond my skill set. I   
   > should start by saying I'm not 100% sure signal reflection is the issue,   
   > but it's my best guess.   
   >   
   > I have a 3.3V clock signal that I'm trying to convert to 5V. The clock   
   > speeds are sub 100 kHz. I'm using a TI level shifter, TXS0108E. Looking   
   > at the signal on a scope, it's a clean signal on the input and output   
   > side when I don't have anything connected on the output side.   
   >   
   > When I hook up the clock signal on the output side, over an   
   > approximately 1 meter wire the signal on the scope is full of noise. The   
   > scope also says the frequency is much higher than one the input signal   
   > should generate. I see the noise push through to the input side. I'm   
   > assuming this is because the level-shifter is bi-directional.   
   >   
   > I've tried a few failed solutions, like using a diode to try and block   
   > out the reflections, but so far no luck.   
   >   
   > Any advice on how to deal with this?   
      
   Have you earthed the oscilloscope to the circuit you are testing?   
      
   --   
   ~ Liz Tuddenham ~   
   (Remove the ".invalid"s and add ".co.uk" to reply)   
   www.poppyrecords.co.uk   
      
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