Solar auto light circuit without light sensoris not working properly - Electronic Circuits Projects Diagrams Free

elmo jung · 1st March 2008, 11:04 AM

Hello.

My name is Muhammad, 14-year-old boy from AU.
I am a beginner hobbist with an interest in electronic circuits.

A few months ago, I got an electronic circuit diagram from radio-flier.com.
http://www.radio-flier.com/PDF%20Files/LZ3W.pdf

That is a solar-poweed night light circuit schemetic without a light sensor like CDS.

If that is correct, the LED have to turne on at night and off at sunlight.
But my result was unsuccessful because the LED worked directly opposite to its originally design.

I applied all components in the same way only besides Q2(I used 2N3904)

I tried several times but the results were same.
I don't know what mistakes are there.
What's worng?

Anyone help me?.

mytech · 1st March 2008, 08:14 PM

If it is working in reverse condition.. you just put an inverter.. simple solution..

audioguru · 1st March 2008, 08:42 PM

Look at the dtasheet for the 2N3904 to see which pin is which. I think you have the pins of Q2 mixed up.

When the solar panel produces power in the light then it turns on Q2 which tunrs off Q1. Then the oscillator is stopped from steping up the voltage to light the LED.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Title	Starter	Forum	Replies	Latest
Circuit auto OFF feature after no events design	Uman	Electronic Projects Design/Ideas/Reviews	2	3rd May 2004 06:34 AM
inverter circuit for computer light	jonjacob	Electronic Projects Design/Ideas/Reviews	9	20th March 2004 05:59 PM
Traffic Light circuit building problems	oxygen454	General Electronics Chat	15	26th December 2003 10:19 PM
Lighthouse flashing light circuit	zman	Electronic Projects Design/Ideas/Reviews	8	8th August 2003 10:05 AM
Help with circuit to light "sport mode" indicator	rlcanon	Electronic Projects Design/Ideas/Reviews	6	2nd June 2003 03:09 AM

1st March 2008, 11:04 AM	(permalink)
elmo jung	Solar auto light circuit without light sensoris not working properly Hello. My name is Muhammad, 14-year-old boy from AU. I am a beginner hobbist with an interest in electronic circuits. A few months ago, I got an electronic circuit diagram from radio-flier.com. http://www.radio-flier.com/PDF%20Files/LZ3W.pdf That is a solar-poweed night light circuit schemetic without a light sensor like CDS. If that is correct, the LED have to turne on at night and off at sunlight. But my result was unsuccessful because the LED worked directly opposite to its originally design. I applied all components in the same way only besides Q2(I used 2N3904) I tried several times but the results were same. I don't know what mistakes are there. What's worng? Anyone help me?. Last edited by elmo jung; 1st March 2008 at 04:18 PM.

1st March 2008, 08:14 PM	(permalink)
mytech	If it is working in reverse condition.. you just put an inverter.. simple solution..

1st March 2008, 08:42 PM	(permalink)
audioguru	Look at the dtasheet for the 2N3904 to see which pin is which. I think you have the pins of Q2 mixed up. When the solar panel produces power in the light then it turns on Q2 which tunrs off Q1. Then the oscillator is stopped from steping up the voltage to light the LED. __________________ Uncle $crooge