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σ26 as good as σ11?

sigma25, sigma26, sigma24

σ26 as good as σ11?

Postby Balcmeg » January 7th, 2017, 2:35 am

Ti,
I been planning to rebuild my gamma3 PSU so that I can fit in a sigma11 instead of the current sigma25 for the LCDUINO supply.
Is it better to just use sigma26 instead?
It would save me some trouble and cost since if I upgrade I need a new enclosure and would replace some trafis for higher capacity.
In the plus side the new enclosure would look nicer ;)


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Re: σ26 as good as σ11?

Postby amb » January 7th, 2017, 2:41 am

σ26 is the same as σ25, except it has negative output voltage. σ26 is not appropriate for the γ3.
I recommend the σ11 as in my reference build.
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Re: σ26 as good as σ11?

Postby Balcmeg » January 7th, 2017, 4:22 am

Oops. My error. I meant if I use sigma78 with sigma25...


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σ26 as good as σ11?

Postby amb » January 7th, 2017, 11:54 am

σ25 + σ78 will be a good low noise supply, but for your digital section it's not a requirement. σ78 won't support any more output current than a standard 7805 regulator, nor does it handle more heat dissipation. These are the factors that a σ11 is much better at.
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Re: σ26 as good as σ11?

Postby Balcmeg » January 7th, 2017, 5:57 pm

Thanks Ti, No excuses then not to get the nicer enclosure ;)
First I'll need to figure out why I don't get a signal. New X1 to be delivered on Thursday.


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