Heath product with 120/240 slide switch instead of diff. wiring

[Garey Barrell]

Murray -

I have seen quite a few pieces of equipment with switchable 120/240
primaries.  The key is to have some sort of mechanical lock on the switch
so it cannot be switched (or nudged) inadvertently.  Usually this takes the
form of a metal plate that is screwed to the chassis that blocks movement
of the switch without removing the plate.

The Drake PS-7 power supply uses two slide switches and has a metal plate
with two holes.  If you put the plate on one way the switches levers have
to be in the 120 position and if you put it on the other way the switches
have to be set for 240.

73, Garey - K4OAH
Atlanta


At 10:33 PM 9/1/2002, multi-volti at MULTI-VOLTI.COM wrote:
>Hello:
>
>I have been randomly looking on the Heathkit circuit archive sites for any
>product that shows a DPDT switch wired to select 120 or 240 primary. Many
>simply showed alternate transformer primary wiring to be selected at time of
>construction.
>
>Some of the oscilloscopes have a triple wiring arrangement - 120/240 plus
>low/normal  or normal/high line.
>
>Can someone identify a product they know has a 120/240 switch-selectable
>primary? I am trying to show someone how a switch is wired to effect this
>feature.
>
>Thanks
>
>Murray
>
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