From: not@telling.you.invalid   
      
   Mike Scott  wrote:   
   > On 01/08/2025 17:52, The Natural Philosopher wrote:   
   >> Well its only 70mA a relay When its on   
   >   
   > x8 though, worst case. Over half an amp. Seemed a lot just to let some   
   > current through to the tracks.   
      
   There are also "high sensitivity" type relays which can use less.   
      
   I repaired a modern model train controller a while ago and it had   
   a bank of mechanical relays inside. Variable speed control was done   
   with a very beefy set of MOSFETs in a H-bridge circuit, which had   
   nevertheless been blown apart when the owner hooked the power   
   supply up backwards.   
      
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