VLF Natural Radio Experiments
“Natural Radio” is the low frequency residue of lightning strikes and space weather. After building a simple preamplifier circuit, you can tune it via the mic input of any recorder.
Resources
Low-Noise Binaural Mics (Primo EM172)
How to make wonderful low-noise binaural mics from Primo EM172 capsules for under $20/pair.
Marantz PMD660 Headphone Jack Fix
This popular Marantz audio recorder has a particularly fragile headphone jack. Here is a step-by-step tutorial on how to fix it.
Light Trigger Circuit
A simple “break-beam” light detector circuit that virtually taps a button whenever an object interrupts a light beam.
Resistor Color Code Chart
Print this and hang it on the wall next to your pile of unsorted resistors!