The old circuits is basic electronics that everyone need to learn!
Electronics learning with Homeschooling
This is simplest automatic solar led light circuit that my son try to make it for basic small solar charger. to use 2 x AA NI-MH battery total 2.4V
This is first mini emergency light of my son. It is very small, use LED display when power outage,use transistor instead relay use AA battery charger.
This is simple hight power LED flashlight,we use 24 LEDs super bright for display and 3 AA batteries and resistor for limit current so cheaper.
My son draw circuits not well with pencil. Thus we use good way to draw circuit diagram, EasyEDA.com, with circuit simulation, PCB design online, and Free!
My son wants to learn Arduino microcontroller for making the robot. Now, he likes Ubuntu OS. Because it is very fast and good no ads and no virus. He likes to…
This is a fast blinking LED bike light circuit For safety when the bike at night. We use two-NPN-PNP transistor oscillator circuit and RC circuit only show on 4 LEDs…