Summer circuits power supply - ranging from 0 to 60 V

I The title means what it says! A power supply specially designed for use with our summer circuits. The novelty of this design is that it has a variable out- put from 0 V up, without using a transformer with two secondary windings. The circuit can either be constructed using the well known 723 IC, or for higher output voltages the L 146, which although less popular, is still easily available. The choice is left to the constructor. The output current limitation is also variable, but once set it is continuously effective. Table 1 shows all the different component values needed to make three different versions (30, 40 and 60 V maximum output). The circuit diagram actually illustrates the 40 V/0.8 A type. The L 146 IC was used because this can handle the higher output voltages far better than the 723. Normally speaking 2 V is the minimum regulated voltage which either IC can provide. The resistor networks R3, R4 and R5, R6 get over this restriction allowing the output to be adjusted r...