When drawing electrical circuits, symbols are used to represent ... Closed switch. Buzzer. Horrible Science fact. It's all well and good having a perfect, simple circuit but it it includes a ...

Electronics enthusiasts may soon enjoy building circuits without the tricky - and unpleasant - task of soldering components, with this new ballpen-like device. Dubbed the Circuit Scribe, the ballpen ...

With the circuit values shown, R2 will drop a bit less than 5 V before D3 turns on. Prior to turn on, D2 remains back-biased and no current flows through the LED (D1).