Light Dark Sensor With Relay Circuit Using LM741

A new wired doorbell has been installed, specifically the Heath/Zenith Model #LE-65-B (Electronic). A new 16 Volt transformer was also added, along with a lighted pushbutton and a diode. Initially, all components functioned correctly, including the lighted pushbutton. However,...

This device prevents paper notes and memos from being overlooked. A paper note placed between two fingers made of a conducting material (metal or conductive plastic) breaks the circuit, allowing pair 1 of Ul-a to go high. This causes...

If circuits experience frequency overvoltage conditions, continually replacing blown fuses can become quite costly. This shutdown circuit addresses that issue by substituting the fuse with a relay and a low-current SCR. When the input voltage exceeds the threshold established...

A useful operation for the cars is delayed extinguishing internal lighting cabin of passengers, after close some door of car. Certain cars allocate this operation from their constructor. Oldest sure do not allocate such operation. This delay makes this...

This hookup is useful in certain house wiring situations where only two wires are available between switches, rather than the usual three-way setup that requires three wires. SI and S2 are standard three-way switches, while S3, a double-pole double-throw...

Hello everyone, please examine this circuit. I constructed it recently, but it is not functioning. I have verified all connections and components, and everything appears to be in order. However, when I power it on... The circuit in question appears...