Solar Charger Controller (CB26028E)

We found this circuit in the October 1997 Electronics Now magazine. The circuit controls a solar panel used to recharge batteries.

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Resistance Bridge (CB3911E)
This is a bridge for the measurement of low value resistances and high values too. The circuit...
Dip meter with tunnel diode (CB23732E)
This circuit was found in Radio Electronics magazine from April 1961. The device has a slot for...
Reaction test (CB22194E)
We found this circuit in an English publication. The transistor can be a BC558. The instrument can be...