This circuit was found in a Popular Electronics from the 90's. It consists of the solid-state variation of the well-known grid-dip meter. MOSFET is a component not very easy to obtain these days.
No information was given on the inductor enrolled in the common core of this circuit two years 80. The...
This photoelectric circuit was found in a 70’s Ferranti's documentation. The circuit uses an...
Originally suggested by Popular Electronics to control Christmas lights, this circuit can...