On 16-May-10 14:12, Harold Hallikainen wrote:
>    
>> Looking at smps + synchronous will quickly show you that  the term
>> "synchronous rectifiier" is pertinent.
>>      
>
> Speaking of synchronous rectifiers, they've been around for a LONG time.
> In the 1950s, some vacuum tube car radios used synchronous rectifiers.
> They used a "vibrator" to chop the car battery DC to AC. Another set of
> contacts on the vibrator were connected to the secondary of the high
> voltage transformer to select which end of the winding to use. The
> secondary was switched in sync with the current in the primary.
>
> Harold
>
>    

     Nikola Tesla used synchronous rectifiers based on motor driven 
contacts.

     MJ



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