CS209A PDF

The principle of operation of the proposed metal detector circuit is quite basic yet very interesting. The detecting function is triggered by sensing the decrease in the Q level of the LC network associated with the circuit in the presence of a metal at a specified proximity level. Basically the built-in oscillator of the IC CS is made functional with the inclusion of a parallel resonant LC tuned network in conjunction with a feedback resistor wired up with the OSC and RF pin outs. The impedance of the tuned resonant network may be expected at the maximum level as long as the driving source frequency is equal to the resonant frequency of the LC circuit network.

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The post details the main specifications and pinout functions of the IC CSA along with other technical aspecst of the chip. The device CSA is a bipolar monolithic IC specifically designed for metal detecting circuit applications. An external LC tank circuit becomes imperative while applying the IC in a metal detector configuration. The externally connected LC circuit in association with the in built oscillator circuit initiates the required oscillations in the circuit in a controlled manner.

The amplitude of the oscillations largely depends on the Q factor of the connected LC tank network. When the LC network responds with a low Q levels, the adjustable low level feedback circuit enables drive for sustaining the oscillations. The peak demodulator stage detects the falling section of the oscillator package and feeds a demodulated waveform to the comparator stage as input information.

The comparator initiates and set up the complementary outputs by comparing the received information from the demodulator stage with an internal reference level. If you have any circuit related query, you may interact through comments, I'll be most happy to help! Your email:. Your email address will not be published. Notify me via e-mail if anyone answers my comment.

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Proximity Detector IC CS209A Pinouts – Datasheet Explained

The post details the main specifications and pinout functions of the IC CSA along with other technical aspecst of the chip. The device CSA is a bipolar monolithic IC specifically designed for metal detecting circuit applications. An external LC tank circuit becomes imperative while applying the IC in a metal detector configuration. The externally connected LC circuit in association with the in built oscillator circuit initiates the required oscillations in the circuit in a controlled manner.

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CS209A Datasheet PDF

A uH coil is used to sense the presence of metal. The inductance of the coil change in the presence of metals and the resultant change in oscillation is demodulated to create an alarm. The LED gives a visual indication too. This circuit can sense metals up to a distance of few inches.

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