AC and DC how to?

[Scott]

I would like to allow my circuit to take both AC or DC power. Does anyone have an example schematic on how to do this? Links? I am used to using a full bridge or just a regulator but never both.

Thanks in advance,
Scott

[NavMicroSystems]

If you have your circuit designed for AC (bridge rectifier + caps + regulator)
You can supply it with DC,
and you do not even have to care about the polarity of your DC supply
or voltage (AC or DC) as long as it is within the specs of your regulator

...I am used to using a full bridge or just a regulator but never both.

How do you ensure a clean and stable supply voltage of an AC powered circuit with only a bridge and no regulator?

[Scott]

Thanks!

I always have a regulator regardless AC or DC. I was not clear in my post. I have a bridge, cap and a standard LDO 12v regulator rated at 35V input. So if I connect it to a 24Vdc power supply it will be fine?

[NavMicroSystems]

Thanks!
...So if I connect it to a 24Vdc power supply it will be fine?

Yes, it will,
and even the DC polarity doesn't matter.

[NavMicroSystems]

I was not clear in my post. I have a bridge, cap and a standard LDO 12v regulator rated at 35V input.

Your post was very clear,
you said there is no bridge in combnation with a regulator:

I am used to using a full bridge or just a regulator but never both

[nomada]

Hi

Scott, Bruce is wright (as always), but do not forget that using a LDO with that voltage difference (24 volt to 12 volt) even a little current will generate a lot of heat at LDO metallic tab, please use a suitable heatsink.

Only wishing to help.

Best regards for both,

nomada

[nomada]

Hi

Just want to say that I mean to say RALPH (not Bruce) sorry about the confusion.

nomada