The irony is that the MOSFET he suggests to use, the NTD4906N, is listed as obsolete on Digikey.
Which is why I pointed out. A lot of reasons people use antiquated components is probably because documentation and reference schematics are easy to find and have probably been refined to be very reliable.
Also what you have on hand. 20 years ago I bought about 100 LM324's for a dirt cheap price. I drag one out whenever I need a non-precision amp or comparator.
Which is why I pointed out. A lot of reasons people use antiquated components is probably because documentation and reference schematics are easy to find and have probably been refined to be very reliable.