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This following circuit diagram is a diagram to make a simple solar cell NiCad charger. The charger is using max 639 and solar panel. Many electronic devices such as the camera or mobile phones use this kind of battery as their power supply. This circuit can be used as a charger for those devices. Parts [...]

Metal Detector is used to sense the presence of metallic materials. This simple metal detector circuit diagram using A 100uH impedance as a sensor. The frequencies oscillation determined by the IC C209A built in oscillator circuit and the coil L1 form as a part of external LC circuit. The mechanism of the metal detector is [...]