From: bulleid@ku.gro.lioff   
      
   In message <106i37k$a3kn$3@dont-email.me>, The Natural Philosopher   
    writes   
   >On 01/08/2025 10:24, Andy Burns wrote:   
   >> Mike Scott wrote:   
   >>   
   >>> The relays are switching DC at 12V, but the polarity is determined   
   >>>before the on/off relay. Most SS relays I've seen are triac-based for   
   >>>AC only; one type would do DC, but not with the polarity changing   
   >>>(and  at 10x the cost anyway!).   
   >>  You could use a H-bridge, rather than build it from discrete   
   >>transistors/FETs they come as a single or dual bridge in an IC,   
   >>possibly with built-in snubber network.   
   >   
   >I am not familiar with how todays model railways actually work. I   
   >thought they had electronics in them to control speed and direction.   
   >   
      
   Some people are still using the traditional DC systems, others use DCC,   
   which requires electronics in each loco.   
      
   Adrian   
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