Clues and Ideas

Articles
Title
Small DC Motor as a Dynamo (IP059)
2N4987 and 2N4990 (IP057E)
2N4988 and 2N4989 (IP058E)
2N4983 and 2N4986 (IP055E)
2N4984 and 2N4985 (IP056E)
Three-Way Switch (IP053E)
Two Wire Control for Two Lamps (IP054E)
Two-Way Switch (IP052E)
Extracting Fuses (IP050E)
Hertz Loop (IP051)
Paper Clip as Alligator Clip (IP049E)

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4W x 500kHz transmitter (CB21803E)
We found this 4W transmitter in a Mullard transistor manual from 1960. The circuit is powered by...
FET Sample and Hold (CB7477E)
This circuit was found in a 1977 Radio Handbook. The MOSFET supports an equivalent. Capacitor C must...
Doors and Windows Alarm (CB18164E)
This simple alarm was found in a 1982 documentation, but uses components that are still common,...