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thanks everyone I will check it all out.<p>Ryan

Thanks everyone for you help It is really nice of you guys to help like this.But I need some more help I built the circuit and the darn thing does not work the circuit seems to work because it buzzs the transformer every ten seconds but these trans are not suppose to buzz this loud it sounds like a ...

Thank you so much Dean one more quiestion on the transformer when I put the two yellows wires on a power supply it made a big spark like it was going plus to minus so will it hurt the circuit when i connect it up.<p>thanks again
Ryan

Hi I was wanting to know if you guys would look at this circuit to see if you could tell me how to hook up this transformer how they want it hooked up, it is the same trans that they call for. primary side has black two wires and secondary has three wires two yellows and one black. while you are loo...

Try this one then if thats what you are looking for then let me know how it goes because I was going to build it.<p>
http://electronic-circuits-diagrams.com ... ckt2.shtml

that's what what I thought because the switching power supply shares the 12 volt and 5 volt ground so I just wanted to be sure.<p>
thanks you all for your help<p>If any one still has a circuit digram that will switch over when the batts go dead let me know.

thanks Greg, you are a great help<p>

thanks for the info again Greg so if I get a plug-in transformer that puts the voltage down to 12 volts A.C I could get rid of some of these steps right?

I have two questions #01 is there a circuit that when two aa batteries go dead will switch over to another set of 3volt batteries i'm going to use this cricuit on a solar charger for the batteries so if the solar panels do not get enough power during the day to charge the batts the circuit will swit...

Does anyone know how to turn A.C power into D.C power?<p>
thanks
Ryan

hi once again i was wanting to know if these circuits will work for me and which one will be better
this is circuit # 01<p>http://electronic-circuits-diagrams.com ... ges/10.gif<p>this is # 02<p>http://electronic-circuits-diagrams.com ... ages/2.gif

I have a digital multimeter R.S cat. no 22-805 I think that it works great along with the meter for
a battery monitor to monitor solar battery charging.

I built a project that was a old phone I put the mic in a remote location to listen to people.Anyway the voltage I used for the phone to work was 4AA batt
(6 volts) to get a phone to ring I heard from my phone company that it is aroung 70 volts A.C

Thanks for your help Greg I'm looking at one of those emergency backup lights now but all i see is a transistor and some diodes the transistor leads go to the light then another one goes to the battery ground then the last one goes to all of the diodes and resistors thats were I get lost.I kind of t...

Wow looks like I found heaven anyway I wonder if anyone knows how to build a battery backup system so when the A.C power goes out it will switch over to battery the battery would have to be different voltage like from 3-12 volts D.C<p>