Variable Voltage Regulator Circuit using lm723


Here is a variable voltage regulator using lm723 circuit. this circuit have output on 1.3-12.2v 1A and over current protection. 2 sets the output voltage regulator. The maximum current is determined by the value of R3: the over-current protection circuitry inside the LM723 senses the voltage across R3 and starts shutting the output stage off as soon as this voltage approaches 0.65 V. C3 and C4, both ceramic, must be placed as close as possible to the integrated circuit, because the LM723 can be prone to unwanted oscillations. This way the current through R3 can never exceed 0.65/R3, even if the output is shorted.

Here is a schematic Variable voltage regulator:

Variable Voltage Regulator Circuit using lm723

Variable Voltage Regulator Circuit using lm723

part voltage regulator:

B1 40V/2.5A
C1 2200uF (3300uF even better)
C2 4.7uF
C3 100nF
C4 1nF
C5 330nF
C6 100uF
D1 Green LED
D2 1N4003
F1 0.2A F
F2 2A M
IC1 LM723 (in a DIL14 plastic package)
R1 1k
R2 Pot. 5k
R3 0.56R/2W
R4 3.3k
R5 4.7k
S1 250V/1A
T1 2N3055 on a heatsink 5K/W
TR1 220V/17V/1.5


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