I never have enough jfets so I ordered some SMD j310's. Without looking at datasheets, I went with 50 of the $0.50 model because the # in stock suggested they were the popular ones. I also grabbed a couple of the "low noise" versions for $5 a piece just to play with. The cheap ones do not list the noise figure on the datasheet, just the noise voltage (something I understrand to only matter at low frequencies because they were measured in the 1/f region, maybe I misunderstand how that works). The low noise version claims about 1dB NF at about 100MHz, but what can I expect from the $0.50 version? What kind of difference should I expect?
Do people use the cheap ones for receivers and mixers, or is that a bad idea?
Thanks!
Do people use the cheap ones for receivers and mixers, or is that a bad idea?
Thanks!