This simple radio was found in a Popular Electronics from the 90s. L1 and L2 have 100 turns on a toroidal core and L1 have a socket on the thirtieth turn.
This circuit was found in the December 1995 issue of Electronics Now magazine. The circuit...
This circuit was found in a 90s Popular Electronics. The emitting lamp that has very poor response to...
In the figure we have a bistable multivibrator using an operational one. The circuit is from old...