Latch ...it needs a little time to settle ...could be improved

Take an "academic minute" and watch the oscillation http://everycircuit.com/circuit/5788210607423488

Why is it oscillating?

@nikisalli ... When the button is first pressed, current is supplied to the base of the left transistor which switches that transistor on, dropping the voltage at the Pmos gate. That causes the Pmos to conduct. When the Pmos is conducting, the base of the right transistor is supplied with current which makes that right transistor conduct to earth. Notice that the right side of the switch has thus now been toggled to a low earth position as opposed to its previous pulled-up-high-by-the-resistor position.....So, if we have the button in its closed state, the base of the left transistor will now be shorted to earth and so make that left transistor stop conducting...which makes the Pmos gate high (due to the 25k pull up resistor) and thereafter we are back to the beginning here with the base of the left transistor now getting current again...etc...etc. Thus we have an oscillating situation which occurs very rapidly, faster than a human button press/release. Hence the capacitor now (with its RC timing) which turns the right transistor on when, and only when, it has charged up enough to reach the threshold....and hence why we do not want a demo which holds the switch closed! We need the finger jab to be short enough to beat the time constant and get the button open before the state changes...and hence the suggestion to further develop the schematic (using different RC values perhaps, before adding more circuitry).

Random on-off switch with nuclear power mosfet http://everycircuit.com/circuit/4777916724674560

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