1.5-25V Power supply with preregulator

1.5-25V Power supply with preregulator
This circuit using KR142EN12 (analog - LM317 ) ic regulator that can handle load currents up to 2 amperes. For higher currents can be used IC LT1083/84/85 that each can handle currents 7/5/3A. 2000uF capacitor C3 is selected from the calculation of the current 1 Ampere. Resistor R9 is used as a current sensor to an ammeter. (more…)