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FC's Electronic Circuits

FC's Circuit Archive

New and Updated Projects


Some of my Free and Open Source Software may be useful for working on electronics projects.

Also, see my list of Linux Cross Assemblers and related projects.

Solar Power Kits for Sale

Several of the 12 Volt solar power circuits featured on this site are available from my kit enterprise, CirKits.com. You can support this site by buying the kits shown below.

SCC3 Solar Charge Controller DAS1 Dark Activated Switch LVD1 Low Voltage Disconnect BVM1 Battery Voltage Monitor


FC's Circuit Archive contains many electronic circuits that I have designed and documented. I have attempted to include a number of unusual circuits, with an emphasis on useful applications over simple toy circuits. The majority of these projects can be built with readily available discrete components.

Most of the circuits on this site have been drawn with the open-source and cross-platform XCircuit circuit drawing program.

Only a few of the circuits in this circuit archive rely on microprocessors. Micros can greatly enhance the power of small devices, but the specialized development tools can put the project out of reach for many hobbyists and the chips and development systems tend to go obsolete in a short time.

The Arduino platform is an easy to learn microprocessor platform with a free software development environment that is so popular it should be around for many years. The ESP32 is a higher-power system on a chip (SOC) with built-in Wi-Fi that can be used for projects requiring a faster CPU and network connectivity. There are a number of small, inexpensive and full-featured single-board computer platforms that can also be used as controllers, the Raspberry Pi is one of the more popular device families. See the Single-Board Computers section below for more SBCs.

I'm a big fan of the Linux operating system. If you have a spare PC lying around, I recommend exploring a number of different Linux distributions. Linux Mint with the Mate desktop performs well on older hardware. Mint is a derivative of Ubuntu. Fedora is another popular distribution, there are many distros to choose from. A large selection of free electronic, audio, video and ham radio applications are available under the various Linux distributions. The Android platform is probably the most wide-spread Linux-based system.

Linux makes a great platform for dedicated systems: take an older computer, install Linux and the appropriate free software utilities and turn it into a specialized device. Possibilities include web servers, network-attached storage (NAS) devices, firewalls (smoothwall), security systems, multi-track audio recorders (Ardour, Audacity), weather stations, music jukeboxes, video recorders, electric train controllers (JMRI), home automation (Hass.io), ham radio modems (fldigi), and much more. Visit LWN.net for the latest Linux news.

Visit The Strat Monger to see my compilation of numerous resources about electric guitars, guitar amps and related equipment.

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