Project 28: DC Dummy Load.

2024-12-24

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Objective:

To build a 3 to 30 V Dummy Load with 30 W load capacity. Max. charge voltage is about 13.1 V, and recharge at 11.8 to 12.0 V. Note the box in the photos has a Type-N connector, that is not part of the standard box.

Structure:

• 4.25 in. Wide
• 8.00 in. Long
• 2.25 in. High
• 3 to 30 Volts DC
• 30 W Capacity

Materials:

1. Enclosure, $15 USD.
2. V2018-ND BREADBOARD Vector Electronics, $7 USD.
3. Mini Rocker Switch 12V 20A T85 2 Pin SPST DaierTek, $8 USD.
4. 8 Position Dual Row Terminal Strip Blocks Milapeak, $15 USD.
5. 10 Ohms ±5% 10W Through Hole Resistor Radial Flame Proof, Safety Wirewound, $15 USD
6. Southwire 55667323 Primary Wire, 18-Gauge Bulk Spool, 100-Feet, Black. Cost $11.65 ea.
7. Southwire 55667323 Primary Wire, 18-Gauge Bulk Spool, 100-Feet, Red. Cost $11.65 ea.
8. 4mm Speaker Banana Plugs-Open Screw Type, Cost $9.
9. 4mm Banana Jack Socket Female Adapter Panel Mount Binding Post. Cost $9 USD.
10. Three-Wire Calibratable DC 0~30V Red Digital Mini Voltmeter Gauge Tester Mount. Cost $11 USD.

Total cost of all materials used $111 USD.

Tools:

1. Dremel 4000, est. cost $80
2. Dewalt Cordless Drill, est. cost $100
3. Weller Solder Station. Cost $105
4. TPI 153 Multimeter. est. cost $75
5. Wagner Heat Gun. est. cost $21
6. 18" Stiff Ruler, est. cost $8
7. Screw Driver Interchangeable Set, est. cost $7
8. Safety Knife, est. cost $6.98
9. Wire Strippers, cost $5.50 USD
10. Pliers, cost $15

Total cost of all tools if all bought new for project is approximately $425 USD.

Procedure

1. Use Ohms law and electrical potential relationsips to calculate the resistance and quantity.
2. Cut Vector Board to size, and drill holes to install into base of box .
3. Wire the radial resistors in parallel.
4. Install the terminal on the board.
5. Install the 4mm bannana sockets in the panel.
6. Install the volt meter on top.
7. Install the switch on top.
8. Complete rest of wiring.