The principle of operation of a novel free-running transistor multivibrator is presented. The circuit is based on the application of a complementary switch, the operation of which is controlled by a single timing network. This circuit provides a suitable means of generating rectangular pulses having rise- and fall-times in the nanosecond range.The circuit exhibits some other useful features which include excellent thermal stability and considerable loading capabilities for both resistive and capacitive loads, and less dependence on power supply variations.The experimental model which was built to verify the design operated properly in the frequency range extending from very low frequencies t frequencies over 5 MHz when only the timing capacitor was changed.