this work on ESP Project 05 PSU for 5V out??? - diyAudio
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Old 24th January 2004, 10:36 AM   #1
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Question this work on ESP Project 05 PSU for 5V out???

I like the ESP project 05 PSU, however I wanted to do some experimenting CMOS devices and such that require 5V power sources, so I was wondering if the following schematic would be sufficient.

The part in red is the addition I made
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Old 24th January 2004, 10:53 AM   #2
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It will work but skip the diode and C3 and connect the regulator directly to the raw positive or the regulated +15V.

But your wallwart need to be at least 16V for the whole thing to work.
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Old 24th January 2004, 11:27 AM   #3
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Two questions;

1. crap, nevermind I firgured one out. Looking at the datasheet 14.5V is minimum for UA7812 to work, I just assumed a 12V wall wart would power a 12V Regulator And LM340 requires 10V at minimum.

2. What are LDO (low drop out) regulators. I see alot of them in the digital voltage levels. Are they better than standard voltage regulators?


So your saying something like this would work mush better?
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Old 24th January 2004, 01:01 PM   #4
Jax is offline Jax  Sweden
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LDO's advantage is their ability to regulate with a low voltage drop over it. Some can do it at 1V while normal regulators like 78xx need at least 3V. Some LDO have low noise as well. Other than that there is no real advantage.

A typical application for LDO is a 3.3V regulator fed from 5V.

And yes, the schematic will work.
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