The device includes a circuit in parallel with {HEAD ~ the switch} which contains a transistor and {TAIL ~ a diode} to cause such voltage drop in the circuit as to prevent current flowing through a second diode when the switch is closed 
contains
The device includes a circuit in parallel with { HEAD ~ the switch } which contains a transistor and { TAIL ~ a diode } to cause such voltage drop in the circuit as to prevent current flowing through a second diode when the switch is closed
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH