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Sigma25 DC input

sigma25, sigma26, sigma24

Sigma25 DC input

Postby rampantandroid » November 23rd, 2015, 2:10 pm

Just to confirm - if I want to do DC input into a sigma25, I can omit C1 and D1 and wire the DC input to the + and - of the rectifier, and then the input - and the output - can be common, correct?

I'm planning to use this in a car off a fuse - are there any other concerns I should consider?

Thanks!
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Re: Sigma25 DC input

Postby amb » November 23rd, 2015, 2:13 pm

Yes you could do that.
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Re: Sigma25 DC input

Postby accessdenied » July 11th, 2017, 2:03 pm

And what about the C2 and C3? Can those also be omitted?
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Re: Sigma25 DC input

Postby amb » July 11th, 2017, 4:29 pm

I don't recommend omitting C2 or C3.
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Re: Sigma25 DC input

Postby accessdenied » July 12th, 2017, 6:46 am

Even if the DC is coming from the sigma2 regulated power supply?
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Re: Sigma25 DC input

Postby amb » July 12th, 2017, 11:26 am

Yes. Most 3-terminal monolithic voltage regulators require some capacitance near their input pins for optimum performance.
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