Headphone dummy load.

Made this today, it’s a Headphone Dummy Load to help me debug some amplifier projects, don’t want to test new amps with expensive headphones so this will do.

Audio jack connected to a DPDT Switch with two resistor settings of
33 Ohms and 330 Ohms, my version is made with four 10W resistors with a 5% tolerance.

I used http://tangentsoft.net/audio/hp-dummy.html as a reference.