Make It Yourself Metal Detector :: XPI - miymd.com

The Mainboard, witch contains the DSP and a 1 bit PWM DAC for audio as well as headers for a HD44780 LCD, User Interface Switches, and the two daughter boards, one for the Analog Fronted (RX) and one for the Mosfets controlling the TX function.

The Analog Fronted board contains the 1MSPS Low noise ADC and is connected to the CPU with a high speed SPI link, This board contains 2 high speed op amps providing a gain between the two of them of 50, it also has isolation circuitry to isolate the fronted during the peak of the fly-back and keep the op amps from saturating. 

The secret to it's deep penetration is  low noise , Everything is designed from the ground up to minimize all types of noise. To do this XPI utilizes the following techniques.

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The Mainboard, witch contains the DSP and a 1 bit PWM DAC for audio as well as headers for a HD44780 LCD, User Interface Switches, and the two daughter boards, one for the Analog Fronted (RX) and one for the Mosfets controlling the TX function.

The Analog Fronted board contains the 1MSPS Low noise ADC and is connected to the CPU with a high speed SPI link, This board contains 2 high speed op amps providing a gain between the two of them of 50, it also has isolation circuitry to isolate the fronted during the peak of the fly-back and keep the op amps from saturating. 

The secret to it's deep penetration is  low noise , Everything is designed from the ground up to minimize all types of noise. To do this XPI utilizes the following techniques.

 
 
 
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