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Author Topic: History Range outlet to Duplex addapter  (Read 4373 times)

Keith Broughton

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Re: History Range outlet to Duplex addapter
« Reply #20 on: November 02, 2014, 02:46:03 pm »

It's a thing of (sniff).... beauty.  :'(
Turns out Mike has a sensitive side.  ;D
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Scott Holtzman

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Re: History Range outlet to Duplex addapter
« Reply #21 on: November 02, 2014, 04:18:03 pm »

Yup, that would work. You should also install a resistor (100 ohms?) in series with the diode for the energy to turn into heat. Without that, the relay can actually "hang up" in the on position for a few hundred milliseconds while the current circulates. Really cool looking (if you're into geeky things).

IIRC, a DC relay coil can generate up to 10X the steady state voltage when the field collapses, which implies that 12-volts DC would generate a 120-volt pulse when the switch opens. I've actually felt that pulse a few times, and it's a pretty good "bite".

Good call on the bleed off resistor.   Yes, you can feel the bite, especially on physically larger relays that have to have a larger electromagnet to move a complex mechanical assembly. 

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Stephen Swaffer

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Re: History Range outlet to Duplex addapter
« Reply #22 on: November 02, 2014, 04:42:41 pm »

Simpler is always better-since I am using an AC source, why rectify it and create headaches needing a diode and resistor to mitigate?  Why not just a 120v to 12 v transformer and a relay with a 12 VAC coil?

BTW, the two black boxes are 2 pole disconnect switches.  Given these examples as well as Frank's switch above it seems it was common to switch both legs.

Of course, if you read through the original version of the NEC (available on Mike Holt's site), the concept of neutral apparently was not yet established.
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Steve Swaffer

Frank DeWitt

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Re: History Range outlet to Duplex addapter
« Reply #23 on: November 02, 2014, 05:55:20 pm »

Simpler is always better-since I am using an AC source, why rectify it and create headaches needing a diode and resistor to mitigate?  Why not just a 120v to 12 v transformer and a relay with a 12 VAC coil?


Besides turning on the shop the relay could start a little MP3 player that plays ZAP!  HUMMMMMMMM.  ant flash a very bright light just once.
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Mike Sokol

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Re: History Range outlet to Duplex addapter
« Reply #24 on: November 02, 2014, 06:16:46 pm »

Besides turning on the shop the relay could start a little MP3 player that plays ZAP!  HUMMMMMMMM.  ant flash a very bright light just once.

Like this? http://www.youtube.com/watch?v=_m7KbVjj7kc
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