The South Central Railway (SCR) has activated emergency control rooms at its headquarters in Hyderabad and Vijayawada, besides patrolling of railway tracks, among other measures, to deal with the ...

Over on YouTube [Lockdown Electronics] reviews an old bit of kit known as the Silicon Controlled Rectifier (SCR). Invented in the 1950s the SCR is a type of thyristor and they were popular back in ...