Just add water…
This is a trick John Klett taught me for testing power supplies and power amps under load. Instead of using a bulky, expensive power resistor and having it get really hot, you just put a regular 1/4W metal film resistor in a glass of tap water. Here I have 47 ohms drawing about 1 Amp from a 48V DC power supply. I’m doing this to test the noise rejection of an inline L-C filter circuit we designed. The numbers on my AP show an improvement of up to 50 dBu after filtering, which seems to leave the TDK-Lambda “line lump” working just as well as an Acopian Gold Box alternative. Hello compliance!
Mucho noise filtering under load
