low voltage foto cell

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dacflyer
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low voltage foto cell

Post by dacflyer » Mon May 20, 2002 10:57 am

anyone have a scematic to share ? i am using low voltage lights ( LED's ) running off of batteries
and only need them on at night. i can only find high voltage foto cells ( 120v. )
i need a solid state low power consumption foto cell that will work off of 12v.<p>if anyone can reply with a schematic i whould be greatful... thanx

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Chris Smith
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Re: low voltage foto cell

Post by Chris Smith » Mon May 20, 2002 1:35 pm

A cad cell and one transistor is all you need, a low voltage [3-5v] relay is also used with a cad or solar cell. Ill see If I have anything pre written, or draw up a simple one in the near future. <p>You can wire a solar charger to hold open the relay circuit and charge the batteries... and when the solar cell stops charging the battery, It also stops powering the relay, ... collapsing the relay and starting the light circuit.

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dacflyer
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Re: low voltage foto cell

Post by dacflyer » Mon May 20, 2002 3:08 pm

ok, but if possible i whould like to have one with out a relay..maybe a trasnsistor or scr if possible...the load is less 1 amp.. thanx

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Chris Smith
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Re: low voltage foto cell

Post by Chris Smith » Mon May 20, 2002 3:59 pm

I have one scanned. Do you have a Email Address I can send it to?

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dacflyer
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Re: low voltage foto cell

Post by dacflyer » Fri May 31, 2002 9:26 am

yes i do... [email protected]<p>thanx :)

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dacflyer
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Re: low voltage foto cell

Post by dacflyer » Sat Jun 15, 2002 9:02 pm

ok, i am still looking for a dc fotp cell here,,<p>whould like it to be small descreet and of the 2-3 wire type that cam be
(2 wire ) be wired in series or
(3 wire )( +/-/load ) solid state,,scr or transistor <p>with dusk adjustment.. load will be less than
1 amp.total..
using it for solar project.. must use little power as possible,,,
thanx

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Re: low voltage foto cell

Post by Faulkner » Tue Jun 18, 2002 12:47 am

If I understand what your after, go to radioshack, pick up a pack of cadmium sulfide (CdS) photocells - five for about $3. You get two big ones and three small ones.

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dacflyer
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Re: low voltage foto cell

Post by dacflyer » Wed Jun 19, 2002 3:04 pm

cds cells will not work alone for what i want,, thanx anyway...i need an actual circuit as described in my previous posts,,, thanx

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