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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Sound Dynamometer (CB16249E)
According to its author, this device indicates the amount of force applied to the sensors. The...
Lie Detector (CB13265E)
The transistor of this circuit found in an old American documentation can be the BC548 for T1 and...
Diode without threshold (CB19493E)
We found this circuit in a circuit manual from the 1980s. The circuit eliminates the conductive...