This circuit is the receiver for the transmitter from the previous project. We also found it in the Radio Electronics Experimenter magazine, 1989 issue.
This encrypted key was found in a 1989 documentation. It controls a relay that is activated only...
This circuit is from an American transistor book from the 60's. The transistor is germanium of the...
This simple SCR alarm circuit was found in an old Poptronics, but can be easily assembled as all...