This is an almost useless circuit, at least to me anyways. I needed 6.3v for a tube project I was working on at the time and this was my way of getting there. While it does provide 6.3 volts I unfortunately failed to read the specs of the tube's heater draw and this method (LM317) ultimately doesn't give enough amperage for what I was doing. Lesson: always read the datasheet.
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