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Designing 0-30V power supply using LM723

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zhi_yi

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Hi there, please help me, i tried to make a power supply using LM723 which its voltage "should" be adjustable from 0-30V/2A. I get the circuit schematic from internet, but after i make it on the breadboard, the results which i get is differ from what is says on the tutorial. I get 3V instead of 0V as the minimum voltage. please help me with a tutorial or a schematic that use LM723 and with voltage vary from 0 to 30V. Thank you
 

723 2n3055

To achieve voltages as low as 0V with 723 regulator you need to introduce small negative voltage reference ..
If you supply 723 of, say, -3V (regulated) and +35V (can be unregulated), the output can be controlled in the range you are after, that is from 0V to 30V ..

Here is one example ..
**broken link removed**
See how R1-D8 deliver additional negative (regulated) voltage ..

Regards,
IanP
 

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