Below is a latch made up of two transistors:
When the base current of Q2 is increased this also increases the base current of Q1 which in turn increases the base current of Q2 more. By such positive feedback, both transistors go into saturation and establish an ON switch.
I have two questions regarding this latch:
- When this latch is saturated by applying voltage at B1, what happens if B1 is left floating just after that. Will the switch remain saturated?
- If the latch is ON i.e saturated, how can it be turned OFF indefinitely besides turning off the Vcc? Would grounding B1 work for that?