Suggested by General Electric documentation from 1968, this circuit activates a relay after 60 seconds, keeping it closed. PUT is an uncommon component today.
Found in documentation from the 70s, this circuit uses components from that time. Some of these...
In the figure we have the way to obtain an adjustable 1 to 10 mAconstant current source. The...
This microphone circuit was found in a collection of American 80's layouts, using operational...