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Joined: 4/7/2009(UTC) Posts: 19  Location: Spain Thanks: 1 times
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Hello,
I´m powering a LCBPS with a 15V-0-15V transformer. When I apply the power, in a few seconds the R1, R2, R3 and R4 resistor run very hot (and i can see some smoke in them). What could be the problem. I´m not sure but i think the transformer has only one secondary with center tap.
Regards,
Francisco
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FJC wrote:Hello,
I´m powering a LCBPS with a 15V-0-15V transformer. When I apply the power, in a few seconds the R1, R2, R3 and R4 resistor run very hot (and i can see some smoke in them). What could be the problem. I´m not sure but i think the transformer has only one secondary with center tap.
Regards,
Francisco That's the problem. You need a dual secondary transformer.
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Rank: Member
Groups: Member
Joined: 4/7/2009(UTC) Posts: 19 Location: Spain Thanks: 1 times
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Thanks Brian.
I changed the transformer to a dual secondary but now I have two problems:
1) I get 15VDC positive supply without load but when I connect the supply to the buffalo DAC I can´t get more than 14.3VDC (no problem with Negative supply that get easily -15VDC when loaded). Moreover, when I look for VAC in the output with my multimeter I get .045VAC in the positive supply while I get a much better .001VAC in the negative supply.
2) Resistors in the positive supply are hotter than negative supply resistors.
Regards,
Francisco
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Rank: Member
Groups: Member
Joined: 4/7/2009(UTC) Posts: 19 Location: Spain Thanks: 1 times
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Sorry  , I mean Russ, opsss
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