This basic relay configuration was found in a July 1994 Electronics Now. The relay is supposed to be sensitive, and the times are changed by changing C1.
This circuit was found in documentation from the 1950s. Note the low supply voltage. The circuit can...
This simple receiver picks up local MW stations with playback on a small speaker. The antenna must...
This circuit was found in a Popular Electronics from the 90s. The frequency range generated...