Help with rectifier circuit

jetbat · 24th July 2010, 11:36 PM

Hi, I am building a power supply for a microphone preamp, +24V, with phantom power, +48V. The +48V is going to use less then 10 mA and the +24V will use around 105mA. I've attached a picture of two rectifier circuits I am thinking about.

Are there any problems with either circuit and which one, if any, has advantages over the other?

Thanks
Scott

nigelwright7557 · 25th July 2010, 01:21 AM

At a quick glance.

The first one wont work as you need a common ground.
Connecting zero volts on one to zero volts on the other will blow up the bridge.
Or, I could be wrong.

jetbat · 25th July 2010, 04:24 PM

Thanks for the reply. As you can see I am still new to this. I have two more circuits.

The first is with a voltage doubler. I'm not sure if the grounds can be tied together like this. Also does the unloaded output voltage of a voltage doubler = Vin*1.41 the same as a bridge rectifier.

The second one is suppose to work but I just need conformation of this.

Thanks
Scott

nigelwright7557 · 25th July 2010, 04:56 PM

Quote:

Originally Posted by jetbat

Thanks for the reply. As you can see I am still new to this. I have two more circuits.

The first is with a voltage doubler. I'm not sure if the grounds can be tied together like this. Also does the unloaded output voltage of a voltage doubler = Vin*1.41 the same as a bridge rectifier.

The second one is suppose to work but I just need conformation of this.

Thanks
Scott

You cant tie the grounds together on the first one it would blow the rectifier.

jetbat · 27th July 2010, 02:06 AM

Is there any problem that anyone can see with the second circuit in the second picture?

RJM1 · 27th July 2010, 04:40 AM

The second one will work an give you +24 and +48V.

25th July 2010, 01:21 AM	#2
nigelwright7557 diyAudio Member Join Date: Apr 2008 Location: Carlisle, England	At a quick glance. The first one wont work as you need a common ground. Connecting zero volts on one to zero volts on the other will blow up the bridge. Or, I could be wrong. __________________ http://www.murtonpikesystems.co.uk PCBCAD40 pcb design software.

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27th July 2010, 02:06 AM	#5
jetbat diyAudio Member Join Date: Nov 2008 Location: Maryland	Is there any problem that anyone can see with the second circuit in the second picture?

27th July 2010, 04:40 AM	#6
RJM1 diyAudio Member Join Date: Jan 2010 Location: Titusville, Fl.	The second one will work an give you +24 and +48V.

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