26 Mar
2006
26 Mar
'06
11:28 p.m.
There was a trick where you could use two DPDT
switches to turn on
the filament and then HV supplies where no matter which switch was
flipped, the filaments always came on first.
You don't need DPDT, just DPST. Wire one pole from each in parallel,
the other pole in series. The parallel-wired ones control the
filament, the series-wired ones the HV. In ASCII graphics:
\ \
\ \
______^ :\_____________________^ :\________ <-- HV switch
: :
\: \:
\ \
______^ \_____ ___^ \________ <-- filament switch
| | | |
| |____________ | __________|
|_________________________|
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