100W dummy load

Parts

There aren't many parts in the dummy load - two resistors completes the component count and all the rest is hardware and connectors.

Circuit

The circuit consists however many sockets you choose - and that probably depends on the connectors you have in your shack - and a resistance of fifty ohms.

The resistance consists two 100R resistors in parallel.

Drilling

To keep the input connector layout as uncluttered as possible, I put the two smaller connectors - the BNC and the Phono - on one end of the box and the SO-239 on its own at the other end.

The top of the box was drilled to take the two fixing screws for the heat sink and then two 4mm holes were drilled to accept the leads from the resistors. The two leads from a TO-247 package are 12mm apart.

The other half of the case - the plain, U-shaped piece - is undrilled except for the two screw holes that are already present when you buy the box. The screws are also supplied with the AB12 enclosure.