LM723 Power Supply Problems

[potatogun96]

I built a power supply based off of this design: http://www.eleccircuit.com/regulator-0-30v-5a-by-ic-723-2n3055-2part/

After building the circuit and checking all my connections, I tested the circuit. The output remains constant, slightly over 30 volts. The LM723 started to heat up, and R4 also started to burn, so I replaced it with a 1k ohm resistor. The output is still constant, but the resistor is not burning like before.

Are there any modifications I should make before replacing the chip with the extra LM723 that I have? I do not want to damage the remaining chip.

[SeanB]

Remove Q1 and Q2, and short between pin 11 and the bases of the 2 power transistors. R5 can be 1k.

You also have your pinouts wrong. Refer to the data sheet.
http://www.ti.com/lit/ds/symlink/lm723.pdf

Save the remaining 723, they are very nice chips.

[potatogun96]

Thank you for the advice. I am new to power supply design, and didn't know where to even begin. I will throw the new circuit together on a breadboard and test before I start to desolder parts, but the new design makes sense.