also provided to a flip flop 26 it is provided to the set input of the flip flop 26 the initial high signal puts the flip flop in the state q 1 the high signal in the flip flop 26 is provided to the base of transistors n1 and n2 transistor n1 is connected to the current mirror formed by transistor p3 and resistor r2 so that n1 receives the current i1 through its collector and base which are coupled together transistor n2 has its collector connected between resistor r3 and transistor p4 with a high output from the flip flop 26 transistor n2 is on so that it shunts or diverts the current i1 away from transistor p4 all the current going through resistor r3 is diverted through transistor n2 when the output of the flip flop 26 is high transistor p4 is provided for delivering a second charging current the second charging current is not active while flip flop 26 is high and transistor n2 is on the collector of transistor p4 is divided into two fractional parts with 1 8 of the collector being tied to ground and 7 8 of the collector being connected to the timing capacitor 20 the fractional portions of the collector in transistor p4 complements that of transistor p such that when both the first and second charging currents are being provided to the timing capacitor 20 the total charging current totals the current i1 provided by current source 16 after.