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Nov 28, 2016 Description. The L78 series of three-terminal positive regulators is available in TO-220, TO-220FP,. D PAK and DPAK packages and several fixed output voltages, making it useful in a wide range of applications. These regulators can provide local on-card regulation, eliminating the distribution problems. These voltage regulators are monolithic integrated circuits designed as fixed voltage regulators for a wide variety of applications including local, on card regulation. These regulators employ internal current limiting, thermal shutdown, and safe area compensation. With adequate heatsinking they can deliver output currents Jun 21, 2016 Description. The L78L series of three-terminal positive regulators employ internal current limiting and thermal shutdown, making them essentially indestructible. If adequate heat-sink is provided, they can deliver up to 100 mA output current. They are intended as fixed voltage regulators in a wide range of Page 1. D1. D2. U1. U2. C1. C2. L1. L2. C3. C4. Trasnf 1. Prim:110 or 220 Vac. Sec:aprox 12 V ac. D1, D2=1N4001. C1,C2> 1000uf/25V. U1= LM7809 . U2= LM7909 see data in google for. U1,U2(forget about values it in the diagram). C3 , C4=0.1 uF/100v. Mar 10, 2014 The L78S series of three-terminal positive regulators is available in TO-220 package and several fixed output voltages, making it useful in a wide range of applications. These regulators can provide local on-card regulation, eliminating the distribution problems associated with single point regulation.