Workshop smoke alarm

Switched smoke alarm for workshop. LED off indicates smoke alarm is active.

knoba - workshop smoke alarm

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LED flashing on indicates smoke alarm is deactivated.

knoba - workshop smoke alarm

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It can get a bit smoky in my workshop!
knoba - lab tripod

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Wiring.

knoba - workshop smoke alarm

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knoba - workshop smoke alarm

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Schematic file below.

knoba - workshop smoke alarm

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Materials:
1 x Switch: 1A, spdt (single pole, double throw)
1 x Flashing blue LED: 10mm, 15mA, 3.2v
1 x 10mm LED holder/bezel
1 x Resistor: 470ohms, 1/4W
Wire: 7/0.2mm 
Small heatshrink tubing

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knoba – Workshop Smoke Alarm Schematic – 2018.fzz

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http://www.homemadetools.net

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Magnetic Bunsen burner

Lovely old thing from ebay.
knoba - magnetic bunsen burner

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knoba - magnetic bunsen burner

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Painted with Finnagans Hammerite.
knoba - magnetic bunsen burner

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Old speaker magnet in the centre, steel band on the perimeter slightly taller than the magnet. Both stuck with silicon sealant.
knoba - magnetic bunsen burner

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In action stuck to the bench. No way that’s getting knocked off.
knoba - magnetic bunsen burner

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More helpful with some unusual annealing jobs.
knoba - magnetic bunsen burner

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MIG torch mini welding visor

Made from 304 stainless steel & shade #9 glass for restricted area access (vehicle welding)
MIG torch mini welding visor

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Removable & serviceable
MIG torch mini welding visor

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MIG torch mini welding visor

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MIG torch mini welding visor

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MIG torch mini welding visor

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Forum – mig-welding.co.uk

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