AC/DC power supply problem

H

hardcore misery

New Member

• Sep 20, 2007

• #1

Is it safe to use 4 voltage regulators (LM317) for each output?

the transformer is 2A with 9V output voltage, and the output voltage of the PSU is 6V.

what happened is, the diode on the bridge rectifier burns OUT!

 

Nigel Goodwin

Super Moderator

Most Helpful Member

• Sep 20, 2007

• #2

What have LM317's got to do with the rectifier burning out?.

What rectifiers are you using?.

 

H

hardcore misery

New Member

• Sep 20, 2007

• #3

i'm using 1n4002 diodes as rectifiers, is it safe?

 

Nigel Goodwin

Super Moderator

Most Helpful Member

• Sep 20, 2007

• #4

hardcore misery said:

i'm using 1n4002 diodes as rectifiers, is it safe?

Click to expand...

They are too small, use 1N5408's instead (or any of the 1N540x series).

 

H

hardcore misery

New Member

• Sep 20, 2007

• #5

oh thanks! i'll be back as soon as i've changed the bridge rectifier.

 

Hero999

Banned

• Sep 20, 2007

• #6

What current are you drawing?

Look at the datasheet for the 1N4002.

 

H

hardcore misery

New Member

• Sep 20, 2007

• #7

above 1A, i'll follow the suggestion of sir nigel. by the way, is ok to use 3A rectifiers on 2A transformer?

 

ronsimpson

Well-Known Member

Most Helpful Member

• Sep 20, 2007

• #8

It is a good idea to use 3A diodes on a 2A transformer.

 

H

hardcore misery

New Member

• Sep 20, 2007

• #9

oh thanks!!! how about gauges of wire? or is it good to use solid copper wires?

 

Nigel Goodwin

Super Moderator

Most Helpful Member

• Sep 20, 2007

• #10

ronsimpson said:

It is a good idea to use 3A diodes on a 2A transformer.

Click to expand...

It's a VERY good idea!