Using the NE5205 integrated circuit this circuit was found in the May 1987 issue of Radio Electronics magazine. It can amplify signals up to 450MHz.
This circuit switches on an external load after a certain interval given by the capacitor. The...
This circuit is from a Poptronics, American magazine from August 2000. The circuit can be...
This simple tester was found in a Popular Electronics from the 90s. The circuit is powered by two 9 V...