This circuit was found in General Electric documentation from 1965. The transistors are from that time. The diodes consist of a component that contained them.
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...