A very lab adjustable power supply that can provide an output voltage between 0 and 60 volts can be designed using this circuit diagram . This lab power supply can be designed with LM723 chip or for higher output voltages, with L146 .Output current is also adjustable, but once established, is always effective. Table 1 shows the values to be modified to have three different versions of the maximum output voltage (30, 40 and 60 V). 0 to 40V Lab Power Supply Circuit Diagram Electrical diagram below shows the alternative 40 V / 0.8 using L146 chip because it can stabilize higher output voltage, much better than the LM723. Normally, 2 V is the minimum voltage stabilized that even an integrated circuit can provide. Resistive network R3, R4 and R5, R6 "kill" this restriction so that output can be set to 0 V with potentiometer P2. Depending on the output requirements, will be decided on the type and the semiconductor capacitors to be used. Output current must be limited so as to ke...