Harmonic Distortion Meter (CB26186E)

This complex circuit was found in the 1993 edition of the Electronics Experimenter's Handbook. Most of the components are still common today.

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Sequential Show (CB16707E)
This circuit was found in a 1992 publication. The circuit uses common components and includes the...
Fuse relay for battery charger (CB7137E)
This protection circuit for battery chargers was found in an old Elektor. The relay is according to...
Seismic Amplifier (CB6207E)
This very low frequency amplifier has a gain of 1,000 and was found in a 1967 documentation. The circuit is...