Latching Circuit Diagram. A flip flop or latch is a circuit that has two stable states and can be used to store state information. A latching relay is electrically set to one position and it remains latched in that position until it is electrically reset to the opposite position.
Resistor r1 and r4 work as a current limiting resistor for transistor q1 and resistors r2 and r3 work as current limiting resistor for transistor q2. Relay latching circuit using push button we connect relay and push button as per figure. This creates a basic memory function the relay remembers.
So for this circuit the first transistor is the bc547 while the second is the bc557.
This creates a basic memory function the relay remembers. One of the inputs is called the set input. An electrically latched relay is a standard relay with one of its own contacts wired into its coil circuit. When we press push button supply goes to relay a1 point and relay gets on and its contact changes but when we release push button supply cutoffs and relay gets off.
