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adam(at)validationpartner
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 Posted: Sun Jan 15, 2006 1:41 pm Post subject: Dimmer circuit for +12v switched items |
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Some circuits, such as the two-speed boost pump and voltage regulator
power are switched to +12v rather than ground. In these cases, you can
have an indicator bulb, but you can't connect it to the dimmer bus. How do
you handle this situation?
Thanks,
Adam Molny
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Bruce(at)glasair.org
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| Posted: Sun Jan 15, 2006 4:17 pm Post subject: Dimmer circuit for +12v switched items |
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Handle the indicator bulb by switching the ground of the bulb to the dimmer.
This can be quite useful. I switch the grounds of the bulbs into and out of
my dimmers with a double pole instrument light switch. Hi intensity when
switch off (daylight), switched to dimmer when on (night time).
Bruce
www.glasair.org
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rv-9a-online(at)telus.net
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| Posted: Sun Jan 15, 2006 5:34 pm Post subject: Dimmer circuit for +12v switched items |
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This is a common problem. At this web site
http://vx-aviation.com/page_2.html, you'll see a product called the
IL-4A that solves this problem by converting all positively switches
circuits to ground-switched, thus allowing for simple dimming.
The schematic is published in the datasheet, so you can either make your
own or buy the one I offer.
Vern Little
Bruce Gray wrote:
[quote]
Handle the indicator bulb by switching the ground of the bulb to the dimmer.
This can be quite useful. I switch the grounds of the bulbs into and out of
my dimmers with a double pole instrument light switch. Hi intensity when
switch off (daylight), switched to dimmer when on (night time).
Bruce
www.glasair.org
--
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