This addition should be of help to builders outside North America. For instance, 3.3 nf (nanofarads) equals 0.0033 uf (microfarads), and 4K7 equals 4.7K, 1K5 equals 1.5K. īelow is a schematic created by John Waghorn of the UK () with European parts designations. If you are interested in ULF reception (and great VLF coverage too), try this excellent and detailed website. Also, this unit will not receive ULF earthquake signals, nor am I very knowledgeable about such phenomena except for the very basics (I say this to reduce the number of inquiries I receive about such phenomena). If all instructions and notes are followed, there should be no problem with it whatsoever.
Please see notes at the bottom of this sheet before contacting me about this unit. BBB-4 VLF Receiver forīroadband 0.1 to 15+ kHz reception of naturally-occurring ELF-VLF radio phenomena. at the drain output and this unit WILL receive Schumann resonance signals if in the open and away from AC sources by enough distance to reduce 50/60 Hz emissions to minimal/nil levels (or use DSP) - Earlier revisions: (October 2004 - jpeg schematic by John Waghorn in England added below) S. (R2)and the receiver will really shine! This is the WR-3 input also - also, swap the input protection diodes with 1N4733ATR diodes from ON semiconductor and the input will be extremely robust. with a 22uFĮlectrolytic (20v to 50v is fine) cap.
REVISED RELEASE - May 2021: Use a 2N5486 N-channel JFET with 1K resistor (biasing R3 R4) on both drain and source leads. McGreevy BBB-4 Natural VLF Radio Receiver Plans Stephen P.
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