astable multivibrator with 4 transistors to control capacitor charge - gives reliable operation on one volt supply using pair of complementary transistors as regulator

摘要

An astable multivibrator system is designed to operate reliably at very low voltages, of the order of 1V. It has four transistors. A capacitor (25) can be charged and discharged from the output voltages of current sources controlled by the multivibrator output through a pair of complementary transistors; the junction of the power sources (15, 16) is connected to the capacitor to control a transistor switch (20, 21) the alternate settings of which produce two alternate output voltages. The power sources may consist of a pair of complementary transistors (15,16).