My son want to make a simple DC voltmeter on 0-10V range by Convert a galvanometer to voltmeter.Galvanometer DC1mA is cheap and easy with one resistor only.
Electronics learning with Homeschooling
The experiment on the simple series circuit. To understand current flow and voltage across all devices in the circuit.
The old circuits is basic electronics that everyone need to learn!
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.