LM317/337 dual rail regulator assembled board for preamplifier/headphone amp !

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On list is a dual rail regulator assembled board to be used with low current application ( below 300mA). using LM317, LM337. This board is particular useful for preamplifier or headphone amplifier.


The broad includes protection circuit to protect the regulator chips from high output voltage reversal.

The board output voltage can be adjusted from +/1.25VDC up to the +/-30VDC( limited by the input voltage). While LM317/LM337 can be used to as good as 1A, this board is recommended for current below 300mA due to the compact heatsink size. 


This board need an AC voltage 12V-0-12V to 18V-0-18V ( for +/-12V DC application). 

PCB Dimension : 70mm x 50mm, Component height(highest) : 35mm


Air shipping cost worldwide by registered airmail is US$6.50. We welcome combined shipping.