200+ Electronic Circuits - Simple Circuits and Mini Projects +5V and -5V Dual Power Supply Circuit. Most of the Analog Electronic circuits require dual power 4-Channel Relay Driver Circuit and PCB Design. Relays are frequently used in our electronics Howland Current Pump Circuit. The simple current source is not perfect for variable loads as the Variable Output Voltage DC to DC Boost Converter using MC34063. In the previous tutorials, we See all full list on circuitdigest Simple Electronic Circuits For Learning About Circuits Dec 09, 2012Simple Electronic Circuits For Learning About Circuits. For each of the three simple circuits I provide a description, a schematic (Eagle), PCB design (Eagle) and even Gerber files that you can download. This way you can choose if you want to start from scratch, start from schematics, start from finished PCB design or just download the Gerber files and get the circuit built.