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Gadget Freak Case #154: Table Saw Quick Cleanup

DN Staff

December 15, 2009

2 Min Read
Gadget Freak Case #154: Table Saw Quick Cleanup

When John Dawson turns on his table sawhe wants a Shop-Vac(R)to automatically turn on, too. He might have controlled a duplex outletfrom a wall switch, but where's the fun in that? Instead, he uses a Hall-Effectsensor to detect current flow in the saw's power cord and then turn on thevacuum cleaner via a relay. John's design adapts well to other controlsituations, too. Don't get sucked into a simple switch circuit.

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Gadget Freak Case 154 Table Saw Quick Clean up

Gadget Freak Case 154 Table Saw Quick Clean up



Amt

Part Description

Allied Part #

1

Hall-Effect Sensor (5mv/G), Allegro MicroSystems A1321

Not available from Allied.

1

LM311 Comparator

248-0043

1

1kI(C) Resistor (1/2 W)

296-4772

1

10kI(C) Resistor (1/2 W)

296-1483

1

10kI(C) Trimmer Potentiometer, 10-Turn

754-1146

1

2N3906 PNP Transistor

568-0293

1

LM7805 or LM340T-5.0 Voltage Regulator (TO-220 Package)

288-0525

3

0.1I.25f Capacitor

507-0211

1

10 I.25f Electrolytic Capacitor (25V)

613-0124

1

24V DC Plug-in Wall Power Cube

967-0147

1

Relay, SPDT, 24V Coil

821-2003

1

1N4148 Diode

431-0614

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