GEM’s Walking VLF enables magnetic measurements to be made along with a single channel of VLF data. VLF or Very Low Frequency surveying is an electromagnetic method used for shallow exploration (up to 35 m or so). Walking mode also enables the use of GEM’s new Walking VLF.Making a VLF metal detector? Jul 17, 2013, 10:11 pm I've been thinking it might be interesting to try to make a metal detector using an Arduino, and it seems like a VLF sensor would be the best way to go outputting signal at ~10KHz should be feasible.The second nine volts battery powers the audio amp section and its good this way if you switch off the vlf receiver section the audio amp section appears to still be using some of the circuit. Also the vlf receiver circuit takes a 9 volts battery and its input voltage is linked to the front sense head section so they can both share one 9 volts battery.I next built a VLF converter to bring the signals to the frequency range of the receiver. The salvaged WW2 variable capacitor with built in reduction drive and robust construction made this a great stable base to start with. I began with my homebrew 80 meter direct conversion receiver. The solution was to build my own VLF receiver.The oscillator tuned circuit from pin 5 to Vcc (pin 4) consists of 56 nH in parallel with a fixed 22 pF capacitor + a tuning capacitor. Although the TDA7021 is specified for 1.5-110 MHz, don't let that scare you. It is a 16-pin surface mount device with an FM receiver with a 76 kHz intermediate frequency.They provide a “receiver” (actually a low-noise pre-amp) to be used with a 96 KHz soundcard and special software that monitors VLF frequencies, records data once every 5 seconds, 24 hours/day, then automatically sends the files to Stanford at the close of the day.The best part is everythinf you need to build it is at Radio Shack. 555 AM Transmitter: This is a very simple easy to make AM transmitter if you don't want to use inductors or capacitors and don't mind not having extreme power.The unit includes a 20.1 MHz bandpass filter which will reduce or eliminate interference to the Jove receiver caused by international broadcast stations. The RF-2080 C/F is a single temperature, calibrated, noise source designed for use with the Jove receiver and Radio-SkyPipe to all data collected to be more useful for science.

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