Found in a 1967 Electronics World, this circuit can use any modern equivalent FET. Observe the amplitude of the input and output signals.
This circuit of the 80's makes use of components of the time. The circuit is from an American...
I got this circuit from Hands-On Electronics, 1988. The American magazine no longer exists, but...
This RF and audio follower applies its signals to a small amplifier. The FET can be any...