A simple test you can use in various circuits of a circuit output voltage can be adjusted gradually with commutator LM317T LM337T Positive Negative Regulator ICs used Symmetric Power Supply Source: http://www.siliconchip.com.au/cms/A_30603/article.html Simple Symmetric Power Supply Circuit with LM317T... Electronics Projects, Simple Symmetric Power Supply Circuit with LM317T LM337T "power electronic projects, power supply circuit, power supply project, " Date 2019/08/02