Internal power supply and PSU mod

Discuss Yocto construction and related issues

Re: Internal power supply and PSU mod

Postby cso5 » Mar 11th, '17, 05:19

By the way my connections are done on the solder side of the board like in your pics.
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Re: Internal power supply and PSU mod

Postby hofmann25 » Mar 22nd, '17, 10:19

Nice, did you attach the Ground Loop Breaker?
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Re: Internal power supply and PSU mod

Postby pradeepkumar » Mar 23rd, '17, 12:05

Thanks for posting
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Re: Internal power supply and PSU mod

Postby LulaNord » May 16th, '17, 17:37

Hi...i am a new user here. As per my knowledge you should put Cathode to diode 109 and the Anode to diode 110 from the twisted pair of diodes then the 15v from the transformer to the twisted end, your other wire connections are also correct.
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Re: Internal power supply and PSU mod

Postby flinte413 » Jun 6th, '17, 14:56

So this one is ok for me? It has 230V to 2x 15V 15VA 0.5A
Living in germany.

https://www.conrad.de/de/ringkerntransf ... 09884.html
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Re: Internal power supply and PSU mod

Postby flinte413 » Jun 8th, '17, 20:06

flinte413 wrote:So this one is ok for me? It has 230V to 2x 15V 15VA 0.5A
Living in germany.

https://www.conrad.de/de/ringkerntransf ... 09884.html


I read the full article now.. sorry for the question.. solved it by myself
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Re: Internal power supply and PSU mod

Postby LulaNord » Jun 16th, '17, 17:26

Hi...i am a new user here. As per my knowledge the y scale is negative dB. For instance you can see a noise peak at 50Hz in both cases.
The external power supply produces a peak of about -86dB at 50Hz.The internal power supply produces a peak of about -75dB at 50Hz, which is about 10dB higher than the external power supply.Similarly, there is a second noise peak at 150Hz that is quite higher (about 8dB) with the internal toroidal transformer than with a basic external ac supply.

printed circuit assembly
Last edited by LulaNord on Jul 6th, '17, 19:37, edited 1 time in total.
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Re: Internal power supply and PSU mod

Postby Altitude » Jun 19th, '17, 15:19

LulaNord wrote:Hi...i am a new user here. As per my knowledge the y scale is negative dB. For instance you can see a noise peak at 50Hz in both cases.
The external power supply produces a peak of about -86dB at 50Hz.The internal power supply produces a peak of about -75dB at 50Hz, which is about 10dB higher than the external power supply.Similarly, there is a second noise peak at 150Hz that is quite higher (about 8dB) with the internal toroidal transformer than with a basic external ac supply.


That was my experience as well, internal was noisier. It's a big magnet after all..
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Re: Internal power supply and PSU mod

Postby hofmann25 » Jun 19th, '17, 21:15

Altitude wrote:
LulaNord wrote:Hi...i am a new user here. As per my knowledge the y scale is negative dB. For instance you can see a noise peak at 50Hz in both cases.
The external power supply produces a peak of about -86dB at 50Hz.The internal power supply produces a peak of about -75dB at 50Hz, which is about 10dB higher than the external power supply.Similarly, there is a second noise peak at 150Hz that is quite higher (about 8dB) with the internal toroidal transformer than with a basic external ac supply.


That was my experience as well, internal was noisier. It's a big magnet after all..


You must not have done it correctly.

Works fine. Especially with the loop breaker
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Re: Internal power supply and PSU mod

Postby Altitude » Jun 21st, '17, 15:13

Have you actually measured the noise on a scope? I have and it was nosier. Same results as LulaNord
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