As my projects have become more involved, I have branched out from just making digital circuits to interfacing to and designing analog circuits, but I am still a neophyte in analog. At the moment, I am trying to design an audio amplifier with automatic gain control, using an opamp peak detector output fed back to an N-channel MOSFET operating in the ohmic region. I would prefer for this particular circuit a fairly wide ohmic region (i.e., gate voltage excursion from turnoff to near saturation). Using simulation, I found a BSD214 N-channel MOSFET that has about 1.2 volts of gate voltage variation across the ohmic region, but it is not readily available except in quantities, and in a SOT-23 package. The other transistors I have simulated always show much narrower ohmic regions.
So, if anyone is familiar with an N-channel MOSFET with a 1 v. or more ohmic region, which is available in small quantities and in a standard thru-hole package, I'd sure appreciate a suggestion.
Thanks in advance for any help.
John Doner