Rob Ruark
About
Electronics Projects
Nixon Phone
Dual Isolated Power Meter
High Impedance Probe
10BASE-T to 10BASE-T1L Adapter
Reverse Engineering Digital Non-secure Voice Terminals
DNVT: Teardown
DNVT: Physical Interface
DNVT: Encoding and Control Codewords
DNVT: Continuously Variable Slope Delta (CVSD) Modulation
DNVT: Interface Test Boards
DNVT: Four Phone Switch
Grid Frequency Meter
Grid Frequency Meter
Live Grid Data
Grid Frequency Meter Block Upgrade
Pulse Dial to DTMF Converter
USB-C Charger
Random Number Generator
Picoammeter
Portable Power Pack
Power Inverter
VFD Tube Clock
Capacitive Discharge Spot Welder
Field Telephone
HP Common Slot Breakout
9V Battery Eliminator
RF Projects
Boat Pager
General Purpose LNA Box
Amateur Radio Filter Bank
Shorter Waves: 33, 23 & 13CM Amateur Bands
Filters
70 CM Filter
70 CM Filter with LNA
Amazon Sidewalk Development Kit
Decent SMA Transitions
Cheap RF Attenuator
Calculators
Voltage Divider Calculator
Buck / Boost Inductor Calculator
Magnetics Calculator
Brewing Calculator
Heat Storage Calculator
Angular Resolution Calculator
Statistical Confidence Calculator
Thermal Resistance Calculator
Hydrogen Calculator
Satellite Nadir Angle Calculator
RF Path Loss Calculator
Copper Plating Calculator
Field Strength to Power Flux Density Calculator
Other
Maps and Earth Imagery
Interactive San Juan County Map
Accessible Islands of San Juan County
Mapping Public Access in San Juan County
Boy Scout Camp Maps
Camp Joy
Camp Sunnen
Camp Warren Levis
Camp Vandeventer
KH-7 St. Louis
KH-7 Seattle
PCB Trace Fuses
Recipes
Old Gallery
Teardowns
Vape ASIC
Garage Door Sensor
USB Lighter
Amazon Sidewalk Development Kit
Radiation
Improved Geiger Counter
Geiger Counter
Ionization Smoke Detectors
Ionization Chamber
Nuclear Spallation
Webcam in a Proton Beam
DSLR in a Proton Beam
Thoriated Welding Rods
Units and Limits
Proton Range
Bad Ideas
Ethernet Over Christmas Lights
Improved Candle
Propane Thermal Storage
Propane Tank to Schrader Adapter
School Projects
Wireless Power Transfer
Maximum Power Point Tracker
Lithium Battery Cell Holders
RF Spectrum Use in The United States
Drag to pan; scroll to zoom
Start (MHz)
End (MHz)
Set range
Reset zoom
Stack rows
Show FCC Examples
Linear
Log
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