25.03.2015

12v dc power supply circuit

The contents of this site are base on wide consultations, practical background and experience. Such a circuit is very useful in cases when we need two DC voltages for the operation of a circuit.
Pls I need a design of a power supply that has an input of 220v with an output of 5v direct voltage. Hi nhoy You have to use only 15 volt 1 amp rating transformer as the rectifiers can handle only 1amp max.
You have to use all the indicated capacitors as they are important to take care of decoupling the power supply for low as well at high frequencies.
Hi Bulgaa The simplest protection will be fix a 13volt zener diode in the 12volt output and 5.6volt zener in the 5 volt output. Alinco's communication technology has created a patent-pending Noise-Offset circuit to eliminate the pulse-noise of the switching circuit for the customer who demands more.
Powers 12V DC Devices such as Cellular Phones, CB Radios, Scanners, HAM Radios, Autosound Systems, etc.


100% accuracy of the contents is not promised, so your contributions and suggestions are highly welcome by the author.
By varying the type number of the IC1 and IC2, various combinations of output voltages can be obtained. If i donot want to use transformer and the specs are 12V and 15A current with 3 nanosec what would i use instead of a transformer and how? Also can i replace the 3 capacitrs aftrt 7812 with a single one,if yes wat diference vl it make. The DM-330MVT comes with short circuit protection, a current-limiting system (over 32A) and extreme-temperature protection. Just store the most frequently used voltage in the memory, and it is constantly ready to go. This site will be updated from time to time, so remember to check back occasionally for updates. The AC mains voltage will be stepped down by the transformer T1, rectified by bridge B1 and filtered by capacitor C1 to obtain a steady DC level .The IC1 regulates this voltage to obtain a steady 12V DC.


I know this is already 12 and 5 volts, how can or what components should I add to generate a 3.3 volts output from this schematic.
Also note that the capacitor must be replaced with the one that has voltage greater than the peak voltage.
Our project is to make an experiment board in instrumentation and control through the PC parallel port. Electrolytic capacitors are wound type hence they have inductive component also in them to take care of it, in decoupling, a disc capacitor which is non inductive also used in parallel, this is very important when you use the supply for energizing digital circuits.



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