This automatic park light switch with LDR automatically turn ON the light when the surrounding light dims to a preset level. The first circuit diagram is an NPN design intended for negative grounded ...

Light operated switch circuit The sensor is a light-dependent resistor (LDR) made of CdS semiconductor whose resistance changes with light. In the presence of light its resistance becomes low, while ...

There are a wide range of applications for light sensitive switches: lighting, entrance door, automatic staircase, automatic opening of doors to the action of a ray of light, alarm systems, etc… Many ...

This light activated remote switch circuit comes with a significant though small current drain in order of 15mA and must be turned off while not in use. On the other hand, when using the CMOS timer ...

This circuit (Fig. 1) simulates the old hourglass timer. A total of 32 LEDs create the effect of sand grains passing from the upper half of sand-glass to its lower half. LED hourglass timer circuit ...

The main part of this LED chaser circuit diagram is 555 timer IC which generates some variable frequency. 555 timer IC is a general purpose IC which can be configured in some different modes like ...