When John Dawson turns on his table saw
he wants a Shop-Vac(R)
to automatically turn on, too. He might have controlled a duplex outlet
from a wall switch, but where's the fun in that? Instead, he uses a Hall-Effect
sensor to detect current flow in the saw's power cord and then turn on the
vacuum cleaner via a relay. John's design adapts well to other control
situations, too. Don't get sucked into a simple switch circuit.
|
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 |
| Get Build Instructions | ||
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