[Boatanchors] Question: Rotary Switch Application
wa5jci at flash.net
Sun May 26 14:39:49 EDT 2013
At 12:35 PM 5/26/2013, William Morton wrote:
>I have a project where my goal is to have one rotary switch act as
>the main power (i.e. standby), heater, and B+ switch. Position 1
>would be off, position 2 would turn on main power, position 3 turns
>on filament tap, and position 4 would switch the center tap of the
>I have seen separate toggle switches used for each connection in the
>past but space is limited. Other applications I have used just have
>one switch which turns everything on at one time. I suppose I could
>do this for my current project but I figured I would try something
>new this time around.
>I happen to have an old rotary switch with 3 poles, adjustable
>number of positions, and make before break contacts. The
>manufacturer is unknown but it looks similar to, say, a Centralab JV
>9002, 9005, etc.
>Main power is 120 VAC, heaters are 6.3V total current 4A max, and
>the rectifier is 5V running at 3A.
>Is the use of such a switch safe in this application? My main worry
>is whether or not I ought to expect arcing issues when the switch is
>moved from one contact to the next. I do not think the current
>levels would be an issue once full contact is made. I cannot find
>specs anywhere for the Centralab style of switch so I would like to
>inquire among the Boatanchor experts.
>Thank you very much in advance for your help.
If this was a project of mine I would use relays with the rotary
switch operating the relays.
de Pete WA5JCI
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