The following metal detector circuit uses two RF oscillator with 5.5MHz frequency. The first oscillator used as a reference frequency produced by the ceramic filter. The second oscillator produced by transistor T3. When there is no metal detected, the value of frequency difference will be zero and the speaker will not produce sound. When the [...]
The simplest method of detecting metal is by beat frequency oscillator. The circuit basically consists of two balanced oscillator. One acts as the detector element, the other provides the reference signal. This oscillator frequency reference is set to fix value, whilst the detector oscillator varies depending on the metal presence. The reference oscillator can be [...]
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 [...]
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