[time-nuts] Fine delay generator (Tim Shoppa)

Chuck Harris cfharris at erols.com
Fri Nov 14 01:59:32 UTC 2008


christopher hoover wrote:
> Tim Shoppa wrote:
>> mostly they were using custom-wound nonlinear wire-wound pots and 
>> motors driving shafts to make the phases :-).
> 
> Oh, that is so cool!   And obvious once you think about it.   I love stuff
> like that.

Actually such things were pretty common in pre-transistor times.
GM used a gizmo, in their buses made in the 1950's, that had 3 such
wire wound pots ganged together, but shifted 120 degrees.  They
connected the pots to a gear on the transmission (in the back of
the bus) and created 3 phase power that was used to drive a
3-phase synchro that ran the speedometer (in the front of the bus).

-Chuck Harris



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