Quantity   Component name
1 × R2 = 4kOhm 7 0805
1 × IC1 = 78L05 in SO-8 case
1 × SMA female jack
1 × 9-Volt battery connector Can be cannabalized from an old 9-Volt battery
1 × Push-button ON/OFF switch
1 × Cement For mounting battery connector and on/off switch
2 × Pogo Pins For probe feed in
1 × R3 = 6kOhm 8 0805
1 × R4 = 47Ohm 0805
1 × R5=1kOhm 0805 LED limiting resistor
1 × C1 = PCB capacitor Trimm copper foil to guage lossto -20dB
2 × C2,C4 = 1nF 0805
1 × C3 = 100nF 0805
2 × C5,C6 = 470nF 0805
1 × D1 = 1A diode, SMD 1A for protection against reverse power polarity
1 × T1 = BF998 in SOT143 case
1 × LED Green 0805 Power on indicator
1 × PCB 040108-1 Gerber files available to Elektor members. Layout PDF available for anyone