From: theom+news@chiark.greenend.org.uk   
      
   The Natural Philosopher  wrote:   
   > Actually re reading the question he wants a *polarity neutral* switch.   
   >   
   > That is not easy.  And is not exactly what an H bridge will do.   
      
   I was wondering about using back to back IGBTs.  See 'four quadrant   
   switching' on p23 here:   
   https://ieee.li/pdf/introduction_to_power_electronics/chapter_04.pdf   
      
   but with IGBTs not bipolar (NPN/PNP) transistors.   
      
   Never actually used an IGBT for real so not sure how 'small scale' they can   
   go, but I'm seeing 6.5A versions so they're not just for kiloamp-scale   
   locomotives:   
   https://uk.farnell.com/infineon/ikd03n60rfatma1/transistor-igbt-   
   00v-6-5a-to-252/dp/3585350   
      
   > But realistically I'd probably use a 3.3 or 5V Songle relay. They are   
   > uber cheap in bulk from Aliexpress.   
      
   Agreed, I think that's the simplest solution here.   
      
   Theo   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)