Clues and Ideas

Articles
Title
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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Digital Temperature Indicator (CB17030E)
This circuit was originally designed to monitor the temperature of a vehicle. The integrated...
Direction Indicator lights on Reminder (CB7114E)
This circuit was obtained in a Popular Electronics of the 90s. It warns when the indicator lamp is...
Amplifier with germanium transistors (CB21817E)
This amplifier circuit with two transistors was found in a Mullard transistor manual from 1960. The...