Hello all,

A bit of a noobie here (2nd year physics and electronics, bla, bla ,bla) mostly doing audio. I took apart a power module from a Mic pre-amp that uses a 24VAC wall adapter to run. After careful examination (it wasn't that complex actually) I came up with this schemo. Please let me know if it makes sense, did I miss anything? Looks ok to me but...Can I also replace the choke (circled) for a RC filter instead? This would supply +48V and +24 from the 24VAC. The 7824 hooks up to a 33v Zener. Values are not in the Eagle schem yet cause I wanted to make sure it was correct.

Thanks

L

 

C1 and C2 are most likely not capacitors.

 

Thanks MrChips but I have the PCB right here in front of me. C1 is a Rubycon 1000uF/50V. C2 is 100uF/50V

 

Well I certainly wouldn't design a power supply like that.

 

Any mods to suggest?

 

Well I certainly wouldn't design a power supply like that.

Why not? It is a standard way of making a rectifier/filter.

 

It's a way to make a voltage doubler. I'm thinking the caps are non- polarized? Maybe not, just 1 cycle.
I think you can replace the inductor with a wire or a low value resistor.

edit: polorized

 

Yes, polarized. Look at the sim. Also, by playing with the ratio of C1 to C2, you can get anything from almost 2X voltage multiplication to less than 1X...

 

I got a little different picture. Did I miss something?

 

I'm pulling a lot more current from the output. Also note my C1 and C2.

 

Ahh yes, I see. I kept C2 low because he said he had a 48 volt supply.

 

Sorry, I didn't notice the 24V to 48V specs in the TS opening post.