Abstract: An intervalometer for use with airborne rocket launchers having a switch assembly with a multiplicity of switch positions relating to the rockets. A solenoid assembly moves the switch assembly sequentially through switch positions for distributing firing current to the rockets. An electronic timing circuit energizes the solenoid assembly for a fixed time duration independent of variations in and characteristics of the solenoid assembly. At the termination of that fixed timed duration (1) a firing current pulse is applied to an individual rocket and (2) an additional fixed time duration independent of the solenoid assembly is initiated by the timing circuit. At the termination of the additional time duration, the timing circuit again energizes the solenoid assembly and the sequence continues. In this way there is achieved a time between leading edges of sequential firing pulses which are consistent, accurate and independent of solenoid assembly characteristics.