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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AC Line Interference Filter (CB452)
This filters blocks radio interference or noise coming from the AC Power line. Noise such as the...
Shutdown circuit 2 (CB8419E)
Found in a 90s Popular Electronics, this circuit triggers a relay in case of overvoltage. Can be used as a...
Alarm System (CB16793E)
We found this sophisticated home alarm in a 1994 documentation. The circuit supports sensors of...