Parts list

1 LT1113 low noise dual op amp, U1. TL082 is used for very low power draw but has more noise

1 PC board
1 1X8 .1 inch header, J1
1 1X2 .1 inch header, J2 (a 1X10 can be used and broken in to)
1 double pole double throw toggle switch, SW
1 a 1/8 inch (3.5 mm) female audio jack, mono. 1 low current LED, LED1
2 9 V battery holders with connector
1 EmFit ( http://emfit.com) 15-M S series detector
as needed armacell TAP18230
1 aluminum chassis box
screws, nuts, standoffs, electrical tape as needed

2 10 Meg 1/4 watt resistor, R1, R2
1 1 K 1/4 watt resistor, R4
1 33 K 1/4 watt resistor, R5
1 100 pf ceramic capacitor NPO, C1
1 10 uF tantalum capacitor, C2
2 .1 uF ceramic capacitor, C3, C4