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Not satisfied with the flow rate he was able to achieve with his Super Soaker, Gordon decided to upgrade to a backyard dunk tank. By hooking up an off-the-shelf sump pump to a power supply and building in microprocessor control, he can blast a victim with up to 5 gallons of water when the target is hit. Switch inputs control the "douse" time from one to nine seconds. The microprocessor clocks data into a shift register to control the seven-segment time display. For easy disassembly and transport (it's great for office parties!), the frame is constructed of 1.5-inch PVC tubing screwed together.
| "Sump" tank parts list | ||
|---|---|---|
| Amt | Part Description | Allied Part # |
| 1 | Circuit Board 0.1 grid 4 X 5 inch | 237-0119` |
| 1 | Plastic Box (Serpac 131) | 882-1131 |
| 1 | 10 K V Resistor, 1/4W, 5% | 296-5586 |
| 1 | 1 K V Resistor, 1/4W, 5% | 296-5562 |
| 7 | 470 V Resistor, 1/4W, 5% | 296-5548 |
| 1 | Shift Register (74HCT164N) | 236-1759 |
| 1 | 7-Segment Display | 782-0425 |
| 1 | Octal Buffer (74HCT244N) | 236-1775 |
| 3 | Terminal Block 1 X 2 | 409-0111 |
| 1 | Transistor 2N2222 | 248-1004 |
| 1 | LM578M05CT Regulator, 5V Pos | 288-0004 |
| 1 | 1N5400 Rectifier Diode | 266-0008 |
| 1 | Capacitor, 220 F, 25Vdc | 852-7030 |
| 1 | 1N914 Diode | 431-0618 |
| 1 | Relay (10A, SPST, 5V) | 788-1079 |
| 1 | Power Supply 12Vdc | 879-0215 |
| 1 | General Purpose Snap Action Switch | 821-1569 |
| 1 | Pushbutton Switch for Changing Time | 948-7193 |
| Additional parts required: 8-pin Microprocessor PIC12F229, sump pump, PVC tubing, assembly hardware | ||
For PDF links to Gordon Wall's instructions and drawings:
Dunk tank information
Sump pump directions
Dunk tank B.O.M.
Schematic drawing of sump tank
Schematic drawing of modified outlet