12v power supply solar

Voltage regulation means to prevent the voltage from dropping down or rising above a specific value. I Have a Transformer 75+75 AC volt plz send me Voltage Regulator Circuit I Used 12+12 DC Volt For This Transformer.
Thank for all the good projects you have about inverters.My question is that,can i use step down transformer to make an inverter,if it can, how can it be used. Here used a bridge rectifier made by four  1N4007 or 1N4003 diode to convert AC to DC . In fact, the ADSL modem was restarted every one hour or so with its original power supply but after I replaced it with this voltage regulator circuit, the modem is never restarted by itself.
Can you recommend a website or two, where I can purchase these parts (especially the 240 VAC to 15 VAC transformer)?

SO if you please provide me with some more information about voltage regulators, then I will be happy. The filtering capacitor 1000uF,25V is used to reduce the ripple and  get a smooth DC voltage. On the other hand, an un-regulated 12V power supply output voltage with drop under while the load will increase and will rise when not under load. My required load was 12V and 1A so I ended up designing the following voltage regulator circuit which is very low cost but at the same time it is efficient.
Any electronic device which requires 12V 1A power can be powered by this circuit so feel free to use it.
For good performance input  voltage should be greater than 12Volt in pin-1 of IC LM7812.

This rise and drop of voltage in un-regulated power supplies can sometimes burn sensitive electronics equipments.
The LM78XX series IC is  positive voltage regulator IC for different voltage requirements, for example LM7805 IC is made for 5 volt fixed output voltage .
The?power?and?output?transformers,?used?in this?amplifier,?tape recorder?on "Astra?4."Power Supply for 1500 Watt Audio Power AmplifierThis Power supply?circuit?is?paired?with High Power audio amplifier 1500 watts.

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