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Hi vead.
Welcome to the forum.
I would try to find an existing project on line, there are plenty of 12 volts DC 2 amps power supply projects out there, if your not familiar with pcb or schematic diagrams you would be best to learn from simple regulator circuits and using a plug in power supply you can purchase to build these prototype circuits on boards designed for this known as bread boards.
The components values are almost always stated in the projects you find on searching the web, not so much single one off diagrams but electronic hobby sites, you can find one on the forum Hobby Projects
This one i believe contains some power supply projects it a forum link.
http://www.hobbyprojects.com/
Welcome to the forum.
I would try to find an existing project on line, there are plenty of 12 volts DC 2 amps power supply projects out there, if your not familiar with pcb or schematic diagrams you would be best to learn from simple regulator circuits and using a plug in power supply you can purchase to build these prototype circuits on boards designed for this known as bread boards.
The components values are almost always stated in the projects you find on searching the web, not so much single one off diagrams but electronic hobby sites, you can find one on the forum Hobby Projects
This one i believe contains some power supply projects it a forum link.
http://www.hobbyprojects.com/
davenn
Moderator
hi vead
welcome ot the forums
OK to find the correct transformer ratings you need to do a little maths
ya dont get anything for nothing
the basic formula is ....
The DC output is approximately: 1.41 x VAC - (2 x 0.7)
That is after the bridge rectifier with the smoothing capacitor. But before any regulator chip if needed
Do you need good voltage regulation ? or is your smoothed 12V DC enough ?
if you need it well regulated then you will have to have a higher voltage out of the rectifier, cuz most regulators need at least 2V above the output regulated level.
So deciding what your DC voltage need to be work that formula backwards and determine what the secondary voltage of the transformer needs to be.
OK here's a basic regulated PSU capable of 12V and 2A make sure your transformer secondary is rated for at least 2.5 - 3 amps
give a bit more info as to requirements
cheers
Dave
welcome ot the forums
OK to find the correct transformer ratings you need to do a little maths
ya dont get anything for nothing
the basic formula is ....
The DC output is approximately: 1.41 x VAC - (2 x 0.7)
That is after the bridge rectifier with the smoothing capacitor. But before any regulator chip if needed
Do you need good voltage regulation ? or is your smoothed 12V DC enough ?
if you need it well regulated then you will have to have a higher voltage out of the rectifier, cuz most regulators need at least 2V above the output regulated level.
So deciding what your DC voltage need to be work that formula backwards and determine what the secondary voltage of the transformer needs to be.
OK here's a basic regulated PSU capable of 12V and 2A make sure your transformer secondary is rated for at least 2.5 - 3 amps
give a bit more info as to requirements
cheers
Dave
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The above project is a good one, but please be careful if your planing on building your power supply for transformer connection to the mains voltage supply, remember to earth or ground metal chassis, and always fuse primary mains sources.
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