Hello,
I need some help in building a 12V dc power supply. I can find lots of documentation on building one from scratch and selecting a transformer for the initial AC supply voltage, but this is my problem. I wish to impliment this 12 Vdc into an audio amplifier and draw from its current transformer. I do not want to introduce another transformer. So, I am confused as there is not much documentation/theory for me to learn from. The exact requirements are 12Vdc @ 600 ma...no idea as for a max ripple voltage...LCD back light supply
I measured a +-38V dc after the rectifier diodes. I have a 12V regulator but I need to know how to get the 38V dc to a usable level for the regulator and have it filtered. Normal theory tells me to use a capacitive filter rated at twice the voltage of the supply. But, the regulator has a max input rating of 34Volts....so now I am lost.
Please, someone help or point me to some www.com where I can learn...again...every place I find assumes building a power supply based on a ideal transformer rating for the intended output voltage
Jerry