1.5V-25V Power Supply with Preregulator | Schematic Diagrams


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1.5V-25V Power Supply with Preregulator

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Power supply with preregulator1 300x171 1.5V 25V Power Supply with PreregulatorThis 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.

In fact, not all of the thyristor passes the half-wave rectified voltage, and some of them, depending on the output voltage and load current. This can significantly reduce the power dissipated in the regulating element, especially at low output voltages and currents.

Parts list :R1 : 4K3R2 : 18KR3 : 100R4,R8 : 100KR5 : 1KR6 : 240R7 : 4K7 ( Variable resistor )R9 : 0.33 EC2 : 0.1uFC3 : 10000uF/40VC4 : 100uF/25VD1 : KY202D2 : KD521D3 : D311D4 : KC147T1 : KT814BT3 : KT209T4 : KT 3102IC1 : KR142EN14 (LM317)

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