cannot yet reach in the preferred embodiment secondary pin 123 is 14 0 millimeters shorter than the ground and primary pins 121 and 122 ground contact 111 is used to provide the card 52 with a ground voltage reference vg and primary contact 112 is used to provide the card 52 with a first voltage v1 which in the preferred embodiment is approximately 5 2 v relative to the ground voltage reference vg when logic state ls1 is reached third and fifth resistor means 173 and 175 bias the second transistor means 192 to be off in the preferred embodiment third resistor 173 is an 8 kilo ohm resistor fifth resistor 175 is a 320 ohm resistor and second transistor 192 is an n p n bipolar transistor because second transistor 192 is off current flowing from ground contact 111 will not pass through the collector 196 of second transistor 192 and must travel the path toward the base 194 of the first transistor means 191 the magnitude of eighth resistor means 178 2 kilo ohms in the preferred embodiment causes a larger voltage drop than does seventh resistor means 177 only 200 ohms in the preferred embodiment this causes first transistor 191 to be on this all forces first capacitor means 181 to be uncharged in the preferred embodiment first capacitor means 181 is a 1 6 micro farad capacitor and second capacitor means 182 is a 0 1 micro farad capacitor with first capacitor 181 uncharged and first transistor 191 on control signal circuit 104 produces a first.