DC Power supply DC V out RLRL AC ~ 110V ±10% 60 Hz

DC out RLRL AC ~ 110V ±10% 60 Hz ?

VZVZ V in RSRS Zener diode shunt voltage regulator V out = V Z I = (V in -V z ) /R s Example: V in = 12 V V z = 6 V I = 1 A W = 12 w Drawbacks: Heat V z fixed

I V out = V Z – 0.6 V I max =  *I VZVZ V in RSRS IbIb Add an emitter follower

VZVZ V in RSRS I IbIb A convention

V in RSRS I Adjustable V out

R1R1 R3R3 R4R4 +V in V out V out = R 3 + R 4 R4R4 V BE Using feedback

R1R1 R3R3 R4R4 +V in V out V out = R 3 + R 4 R4R4 (V BE + Vz) Improvement

+V in V out R4R4 Current limiting

R1R1 VZVZ R2R2 R3R3 +V in V out = R 2 + R 3 R3R3 VZVZ Using an op. amp.

LM78 XX V+ in 2 3 Available XX : 05, 08, 09, 10, 12, 15, 18, 24 (V), and etc. 1

V- in LM79 XX V- out

LM117/317 V in V out

A review of JFET p n p n p n Transistors

MOSFET n n-Si Al SiO 2 D S G Transistors

R1R1 R3R3 R4R4 +V in V out V out = R 3 + R 4 R4R4 V BE