Risam's Photos

Output Filter

Exciter, Modulation Transformer

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cat radio - the story  |  cat radio - photos

200-watt class E AM transmitter  |  35-watt AM transmitter  |  14-watt FM transmitter  |  AM story

twist-shift keying  |  1750m transmitting antennas  |  Shortwave Spark Transmitter

laser shotgun/rifle  |  laser beam concentrator  |  laser pointer audio modulator  |  music on a light beam

cats  |  dogs  |  hemorrhoids  |  tunes

6-button key set

LED-illuminated star  |  current-regulated high-voltage LED power supply  |  shunt LED flasher  |  photo relay

cat-on-radio  |  det 1/21, 601 tcs  |  heating cost calculator

precision frequency comparator  |  2012 WWVB receiver mod  |  ultra precise voltage reference

ride on the Cumbres and Toltec

communicate with the PICAXE  |  web server/PICAXE interface  |  PICAXE outside temperature/server project

Dead-Man Alert System

mortgage amortization calculator  |  credit card payoff calculator

wheatland, wyoming 24-hour temperature record  |  negotiate a roundabout |  an old relay station

sinewave image generator |  pendulum driver |  pendulum phase comparator

long-range wireless gate annunciator |  PIR motion sensor rebuild project |  HB100 microwave motion sensor

temperature-compensated solar battery charger |  beep/siren power amplifier

DCCAD |  rattlesnake |  PRAL calculator |  electronic attic fan thermostat

1733 anemometer interface |  GPS Disciplined Oscillator Drives Electro-Mechanical (Analog) Clock