It can also be used for testing infrared burglar alarm systems. This is not an infrared motion detector! The IR detector circuit in principle, converts the IR signal pulse trains into noticeable aural ...

Here is the circuit of an ultra sensitive IR receiver that can be used to switch on various AC devices through an IR transmitter. It uses the Photo transistor L14F1 to detect IR signals from the ...

We can see how circuits work, and represent them with some simple diagrams, using basic electrical components like these. You start with a cell, or combination of cells. These could be batteries ...