Reactive Load Box Schematic

Schematic for 3a load box.

Reactive load box schematic. Designing a reactive speaker load emulator. Starting from the randall aiken paper on a reactive load box i combined that with 3 attenuation level 6 12 and 18db selectively sending more and more current through the reactive side instead of the speaker plus an l pad for fine volume control. A speaker presents a varying impedance load to the amp. This circuit will apply a resistive based load to safely discharge a tube amp v.

The reactive load is dedicated to being the absolute best load box possible with zero compromises and therefore does not include speaker emulation. If you want to make a fully adjustable load box add a 1mω log taper pot or 10 turn 100kω pot between u1a and u1b. You can use the reactive load with your speaker sim or impulse response of choice and benefit from the natural response dynamics and touch sensitivity of your amp. The stated impedance is usually measured at 400hz and can vary widely over the frequency range.

Aiken dummyload diy project pdf aiken dummyload tech paper. The opamp an lt1635 also contains a buffered 200mv reference u1a which is amplified to obtain 3v. I trimmed the output current to 3a by adding 2mω across r6. Links to power attenuator schematics and dummy load schematics.