When playing with a 9W resistor as a dummy load, it would get very hot even with my 2WAX84 4-4-0amp. I got some higher power resistors just to keep everything cooler. Two 15 ohm, 17W resistors in parallel yield 7.5 ohm load with total power handling of 34W which is way more tha...
Once you have the rectified output signal available from your dummy load, you can make other measurements. By selecting a filter capacitor and a parallel resistor across your binding posts to tailor your time constant, you can check the CW keying waveform across your binding posts, for instance....
The reactive load is essentially a dummy load for the amplifier that replaces a speaker with something that won’t produce sound. Passive loads typically use resistor banks but since this one is active, it needs a very large inductor to handle the amount of current being produced by the ampl...
The goal of this project is to design a simple but robust dummy load/electronic load using the fewer components possible but providing with a product that can do its job reasonably well and cheap. Also a great customization of the circuit was archieved, both in the components and in the max...
Below is a plot for 100uH inductor in series with a 7.5ohm resistor (thanks FredB!). It shows that impedance increases after 1KHz or so. For purely resistive load it is constant for any signal frequency. Construction When playing with a 9W resistor as a dummy load, it would get very ...