Have you had the time to measure the voltage across each LED.?
If you connect a 3.2V and a 3.8V LED in parallel, there is a good chance the 3.2V LED will quickly die.!
If I use the 250 ohm resister to test I do connect that to the battery on the postive side and check each one of the leds seperate. I only have a 220 ohm resister will that work?
If I use the 250 ohm resister to test I do connect that to the battery on the postive side and check each one of the leds seperate. I only have a 220 ohm resister will that work?
Sorry I did not get on the computer last night, but this morning I checked the led with the 220 ohm resistor and the voltage was 2.4 volts just enough to light the led but not bright at all.
Sorry I did not get on the computer last night, but this morning I checked the led with the 220 ohm resistor and the voltage was 2.4 volts just enough to light the led but not bright at all.
Ok on the photo cell I used another one out of the package and here are the results I got in the light measures 4k with my finger over the cell it measures 36k I am guessing that are better results.
I've used the cd cells in that Radio Shack package for dozens of circuits and experiments. There are three sizes represented in the package. Only the middle sized works with any dependability. However, I have used it with any number of different circuits, including exactly the one you posted. Use an NPN transistor, (2N2222 is ideal) with at least a 1K ohm resistor paired with the CD cell in the voltage divider.
I do not think you will have much success, however, trying to drive as many as eight LEDs off just one circuit. With five volts Vcc, as an example, I can only get two red or green LEDs to work as designed in series with a suitable current-limiting resistor.
I have been looking at your diagram and I think I understand it, I am going to check out RadioShack web site and see if they have all the part, that is the only place around here that has any electronic parts.
I have been looking at your diagram and I think I understand it, I am going to check out RadioShack web site and see if they have all the part, that is the only place around here that has any electronic parts.
Battery size 4.5 AH, 6 volt. I think RadioShack will have everything, I am going to print the diagram out before I go, and take it with me. Going to try to get there this afternoon.
Just wanted to thank you for your help, I bet I will be asking more question as I build the circuit.
I am in the states, and I love the UK, one of my favorite performers is Gary Numan love his music. Have you heard of Him?
Battery size 4.5 AH, 6 volt. I think RadioShack will have everything, I am going to print the diagram out before I go, and take it with me. Going to try to get there this afternoon.
Just wanted to thank you for your help, I bet I will be asking more question as I build the circuit.
I am in the states, and I love the UK, one of my favorite performers is Gary Numan love his music. Have you heard of Him?
I did not make it to RadioShack today, but what I thought was a 220 ohm resistor really was a 220k so the reading I got was incorrect, I will get the correct resistor also when I get to RadioShack.
I am on the way to get the correct size of resistor to check the LED's I thought I better do this first before purchasing all the other parts. I will check the led's tonight and post the results.