Category Archives: homebrew

VLF antenna

18_1_khz

This my vlf antenna, yes it is a deguass coil from an old tv, an tl-074 as instrument amp and BPF ~400 Hz – ~100 KHz

Above is the instrument amplifier and BPF.

The thin black line is a demagnitising coil from an old TV, the picture is taking looking straight south

10.140 MHz QRSs beacon

Got samples from analog.com.brNow to put them into use:

1) get geda installed

2) check/find the schematic symbols

3) check/find the pcb footprint

4) draw the schematc

5) layout a pcb

6) ask a friend to make the pcb

7) go into soldersmoke ( is a podcast actually)
8) make program for a pic or simply control it with an USB to lpt converter

#1 is done, to #2 though symbols needs to be created.