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Super-Simple Electronic Project Circuit Diagrams

Dick Cappel's page illustrates an extremely basic small FM transmitter that rebroadcasts sounds using a 1.5 Volt battery. very simple circuit.
Shows an electronic circuit diagram (schematic) for a simple 10 Watt audio amplifier, using only 4 transistors.
Photo: 500 in 1 Electronics Science Lab (Learn Electronics) 500 in 1 Electronics Science Lab (Learn Electronics)
The Electronics Lab has 500 different circuits and projects that can be assembled, all in one box. It's the ultimate way to learn electronics.
PCB plans and circuit diagram (schematic) for what appears to be an extremely nice 100 watt guitar amplifier. Includes preamplifier and power amplifier circuit diagram and PCBs
Metal detectors a tons of fun. These metal detector electronic circuits will enable you to go hunting for all kinds of cool stuff, wherever you like!
Shows the pins and wiring instructions for creating an RS-232 Null Modem for your PC.
Photo: Universal Wall Adapter Power Supply Universal Wall Adapter Power Supply
This is a practical power supply for all your projects. It provides 6 different outputs between 6 and 20VDC @ 500mA.
Photo: * USB PLL FM  Stereo Transmitter (FCC Approved) * USB PLL FM Stereo Transmitter (FCC Approved)
An excellent Stereo FM Transmitter which operates through the USB port of essentially any computer. FCC Compliant!