|Created||March 28, 2013|
|Last modified||March 28, 2013|
|Tags||adjust dual power-supply supply variable voltage zero|
Dual Voltage DC Power Supply with circuitry to allow the adjustment to overcome the minimum 1.2 volts of the LM317 and LM337.
The approximate 1.2 volt drop of D5-D6 and D7-D8 is the secret. By applying a +1.2 volts to the negative voltage adjust you overcome the minimum 1.2 volts of the negative voltage regulator. The same is for the positive side by applying a -1.2 volts to the positive voltage adjust you will overcome the minimum 1.2 volts of the positive regulator.
Very interesting. I am in the process of sorting a bench top modeled after this. Have you put this to real world yet?
February 04, 2014
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