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Old 07-31-2007, 04:35 PM #1
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Default i really need help

explain THIS, finding the parts wont be super hard, but im having trouble understandidng all the connecting and stuff.


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Old 07-31-2007, 07:05 PM #2
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Default Re: i really need help

It is a very simple photodiode circuit to trigger a relay to switch, what do you find so hard to understand? if you say what you dont understand, then maybe me or someone else can help. If the relay is bothering you, then just consider it as a switch. The two vertical lines on the right hand side of the relay graphic are simply a switch, either open or closed to power another circuit of your design. The coil side of the relay simply requires a very low current signal , in this case supplied by the photodiode to make the actual switch. The diode bridging the gap on the relay is simply there to stop any reverse voltage occuring, when the relay is switched. (ie , a reactive load to the switching coil)

I am no electronics expert, but to me the inclusion of the transistor is to act as a simple amplifier to boost the signal current from the photo diode to enable the relay to switch, and the Potentiometer is there to adjust the sensitivity of the light (or absence of) to enable the switch to take place.


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Old 08-01-2007, 12:11 AM #3
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Default Re: i really need help

ok, makes sence, but hoe do you attach the initial 6V?

there is one line in the diagram, but what about the positive and negative?

and what would you reccomend? a 6V dc? 4 AAAbatteries? cut of one thrid of a nine volt battery? i dont know :P
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Old 08-01-2007, 04:24 PM #4
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Default Re: i really need help

Um. Connect the plus to the +6vdc at the top, the negative is connected at the sign for earth at the bottom (the arrow made up of lines).

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Old 08-02-2007, 08:58 AM #5
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Default Re: i really need help

they do sell 6v latern batteries for that :P
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