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DN Staff
December 15, 2009
2 Min Read
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
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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