New Stuff on FC's Electronic Circuits

Page last updated: August 10, 2026

Projects available as kits:

• SCC3 12V/20A Solar Charge Controller with a kit for sale.
• DAS1 12V/10A Dark Activated Switch with a kit for sale.
• LVD1 12V/15A Low Voltage Disconnect with a kit for sale. With a new mod for running a Raspberry Pi on solar power
• BVM1 12V Battery Voltage Monitor with a kit for sale.

These projects are new or they have been updated recently:

• PWM Motor Soft Start Circuit for controlling a bilge pump motor
• Hammonator 29R AO-29 Organ to Guitar Amp Conversion with push-pull 6V6 tubes and reverb
• Musical Beat Detector for driving LED sequencers
• 12 Volt Differential Temperature Controller updated circuit
• 8x8 LED Matrix Domino Clock an unusual way to read the time
• Arduino 20x2 LCD experiments display animations, scrolling text and numbers
• The W0RIO Simpler Is Better Morse Code Keyer based on an Arduino Nano
• 100:1 High Impedance, High Voltage Probe for extending the range of a DVM
• 12 Volt 4 Amp Fixed/Adjustable DC Power Supply two builds with an improved circuit
• Automatic Leslie Speaker Controller for a model 31H Highboy cabinet
• Drake 2B receiver info, mods and calibration tips passband filter alignment process and more
• Spartacus Max AO-35 Organ to 15 Watt Guitar/Monoblock Amp Conversion with push-pull 6L6 tubes
• Basserator AO-63 Organ to 40 Watt Bass/Guitar Amp Conversion with push-pull 6L6GB tubes
• The Sol-Man Solar Powered Electric Guitar Amp solid-state amp with spring reverb
• Victoreen CDV-700 6B Geiger Counter Repairs and Improvements
• Hot-Rodding a Fender Princeton Reverb amp restoration and modification of a classic amp
• A tale of two Fender Twin Reverb amps restoration and modification of 1969 and 1972 amps
• Vacuum Tube Stereo Microphone Preamp with new first-stage gain control and improved tone stack
• Simple Telephone Intercom System using two phones
• Squasherator Vacuum Tube Compressor Altec 436c circuit with extensions
• Enhanced Octopus Curve Tracer with a transistor base bias circuit
• Lightning Activated Camera Trigger second-generation circuit with many improvements
• QRP Antenna Tuner improved circuit matches more antennas
• Liquidator Phaser/Chorus improved circuit and updated text
• Arduino LFO Waveform Generator new software and updated schematic
• Digital Clock/Thermometer using a Side-Lit LED Display with an aqua-colored LED eye-candy display
• The W0RIO Retro-1970s 24 Hour 12V Digital Clock a fun project made with an old-school clock chip
• Spartacus Hammond AO-44 Organ to Guitar Amp Conversion updated schematic and text
• Squirrel Monkey One Tube Guitar Amp updated schematic and text
• 5 Decade Current Meter handy stand-alone current meter
• The W0RIO Accu-Keyer Extended improved version of a classic TTL Morse code keyer with EPROM messages
• High Efficiency 12V White LED Driver
• The W0RIO 15 Meter QRP Transmitter a crystal-controlled 100mW QSK CW transmitter
• Automatic Stereo Shut-Off powers down an audio amp after the music stops
• The W0RIO Meadowlark 6JH8 Direct Conversion Receiver using a sheet-beam tube
• Experiments With A 6AR8 AM/DSB Modulator
• Fluorescent Magic Eye Tubes

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