Comments on: Automatic Night Lamp using LDR

By: Arpit jain

Arpit jain — Fri, 11 Sep 2020 07:50:17 +0000

Cleaver circuit using comparator for definite high output and clever power
supply direct from AC, i wonder so many talented indians are there still we import 90% electronics from CHINA !!

By: V GOPALA KRISHNA KRISHNA

V GOPALA KRISHNA KRISHNA — Tue, 19 Nov 2019 13:17:38 +0000

I assembled the above circuit. It is working fine. But, while switching, the relay is chattering on off light is flickering very fast at the set level. As suggested by Mr. Marksh (April 13, 2017) I connected firstly 560 K resistor between pin 1 and 3 of lm 358. As still the chatter is continuing, I changed it to 1 M. But still the chatter is taking place for few second but with slow on off of the light. I request you to please suggest me for the further course of action to be taken by me. Thanks before hand. VG KRISHNA, HYDERABAD.

By: joshi

joshi — Mon, 17 Dec 2018 13:37:58 +0000

plz tell me,the working when we have to use ic 741 as a comparator in automatic night lamp & when we have to use transistor as a switch tell me its range in active as well as saturation region ???

By: Dan Baconga

Dan Baconga — Thu, 04 Oct 2018 07:35:02 +0000

HI! PLEASE HELP ME I WANT THIS KIND OF PROJECT FOR MY FINALS IN MY ELCTRONICS SUBJECT AND I WANT PUT A MORNING ALARM. BUT THE PROBLEM IS IT MUST NOT USE AN IC BUT ALL AUTOMATIC NIGHT LAMP WITH MORNING ALARM CIRCUIT USE AN IC. ARE THERE ANY AUTOMATIC NIGHT LAMP WITH MORNING ALARM CIRCUIT THAT DOES NOT USE AN IC?? PLEASE HELP. THANK YOU

By: Steve

Steve — Wed, 09 May 2018 08:37:42 +0000

In reply to Akshay Kumar. It's simple, just reverse connection between relay and lamp. (NO to NC / NC to NO)

By: Ligo George

Ligo George — Sat, 21 Apr 2018 02:55:45 +0000

In reply to Ligo George.

Hi,
Sorry currently we don’t have the PCB design of the above circuit. You can drop a mail to [email protected] if you need it to be developed.

By: Akshay Kumar

Akshay Kumar — Fri, 13 Apr 2018 21:59:16 +0000

In reply to Akshay Kumar. Sir can i get the PCB design for the circuit please!

By: Ligo George

Ligo George — Mon, 02 Apr 2018 03:01:37 +0000

In reply to Akshay Kumar. Please check the position of LDR and Resistor R1. Also check whether you connected inverting and non-inverting terminal of the opamp correctly.

By: Akshay Kumar

Akshay Kumar — Mon, 26 Mar 2018 07:28:42 +0000

My project is working opposite
When its bright the lamp is on and when there is dark then the lamp is off

By: shawon

shawon — Sat, 18 Nov 2017 17:45:00 +0000

i am using 684 pf , 400 v capacitor..and i got 9.54 output voltage in multimeter.. for that i m using 6v relay bt my circuit is not working.. relay is not working and bulb is not glowing… what i have to do now? pls ans asap .. 🙂