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Line Power Supply
All materials and content contained on this page are the exclusive intellectual property of Andrew R. Morris and
may not be copied, reproduced, distributed or displayed without his express written permission.

This circuit provided a regulated output without a power transformer.  It is similar to common circuits, except that a zener diode is replaced with an SCR.  This is far more robust against line voltages surges than a zener diode version, plus there is no heat generation.  C1 sets the available current (20mA/uF @ 60Hz).  R2 sets the output voltage (-.55V/K).  The bipolar outputs are separately adjustable by R3 and R5.

In the bipolar version, you could replace SCR1 with a small TRIAC and delete SCR2.  L1 can be deleted, but it prevents possible interference with X-10 units.  R1 acts as a fuse and an inrush current limiter.  The high side of R3 can be moved to the other side of D2 for slightly better regulation, but slower transient protection and a little more energy loss.  This circuit is ideal for applications where a relay of heavy load is switched on and off, that would cause overheating of a zener diode regulator.

More:  Ac to DC Power SuppliesRegulated Power Supplies Voltage Regulator Circuits
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