Hi øyvind nydal dahl. The first diagram shows how the circuit can be configured using transistors the second and the third circuits demonstare the principle by using cmos ics while the last circuit explaines the same concept being implemented using the ubiquitous ic 555.
Automatic Dual Day Amp Night Switch Using 555 Circuit Diagram
Day night switch circuit diagram. 2 my led is 1w and it has forward voltage 32 34v and forward current at 300ma. Eg evening or night time and switches off automatically when enough ambience light is present. When light fall on ldr in day then the resistance of both ldr is low and when the resistance is very then the all voltage through passes the r2 droped with negative supply and no sufficient voltage goes at base terminal of transistor. This is the circuit diagram of a light activated switch based on national semiconductors comparator ic lm 311 and a ldr. The circuit will automatically switch on the ac lamp when night falls and the lamp will be automatically switched off after a preset time. Capacitor c1 must be 400v rated.
I have modified your circuit night detector circuit and i want some help cause im a beginner. The working of this automatic night light bulb switch without transformer is simple. Use 9 12v relay to connect the bulb. At daythe bulb is an automatic switch off and at night automatic switch on automatic night bulb switch. Eg in day time when the sun light is present additional light may not be needed. 1 light activated day night switch using transistors.
Learn how simple it is to build a 12 volt day night switch. This transformerless automatic light operated night light circuit is very simple and easy. Ive modified the following parts. The circuit is based on a voltage comparator circuit wired around ic 1the non inverting in put of ic1 is given with a reference voltage of 6v using resistors r3 and r4. In this circuit no transformer used so it makes this very portable and small. A simple light activated switch description.
The circuit of an automatic night light described in this article can be used to put off a light when day breaks and switch it on back when darkness sets in. The working of this night light circuit very simple. Myneed circuit dyagram for ldr day. Automatic night light circuit. The entire circuit of this 12 volt day night switch can be built over a small piece of general pcb and the whole assembly along with the transformer may be housed inside a good. This is the circuit diagram of a light activated switch based on national semiconductors comparator ic lm 311 and a ldr.
3 ive replaced the resistor with one at 68 ohms. And thanks for the article. A cheap and simple automatic night light using few transistors and ne555 timer is shown here. 1 power source at 5v.
Gallery of Day Night Switch Circuit Diagram
