Scullcom Hobby Electronics #11 - Design & Building a Precision Voltage Reference Box

PLEASE NOTE: Error on whiteboard - The PNP (2N3906) emitter - collector should be reversed. In this project I take you through designing, testing and building a precision voltage reference standard box giving both 10 and 5 volts to an accuracy of ±0.025% or better with out any adjustment. With the addition of a trim circuit the accuracy can be increased to ±0.0005% or better. Using standard available components it can be built in a few hours.