Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

permanent latch circuite

Status
Not open for further replies.
J

javadamirpoor

Member level 1
Joined
May 17, 2011
Messages
37
Helped
1
Reputation
2
Reaction score
1
Trophy points
1,288
Activity points
1,529
i need a circuit that when normaly close contact become open , output become high and output stay in same status for permanent and
output do not become low when contact has become closed ,again
 

Use this :

Senzor NC NO Connections (3 variants).jpg


In your case use second circuit.
 
javadamirpoor said:
tpetar dear .tank you for circuit.but in this circuit output become off when optocoupler become off.i want to output has became on when opto coupler become on only one time. :roll:
Click to expand...


Optocoupler is output you mixed sides!
Input is marked as sensor (NO/NC), and output state is on optocoupler!
I explained all with text in picture!

;-)


Scenario 2
When sensor is NC (normaly connected) then optocoupler output is NO (normaly opened), in other case,
when sensor is Opened then output on optocoupler is Closed (connected).
 
Last edited:
javadamirpoor need such circuit that optocoupler stay in closed (connected) position ..... independant if after open contacts are again closed! OPTO must stay closed (connected)!
 
Its simple, at output of optocoupler put some additional circuit when this circuit first time turned on stay on forever, indipendent of state of optocoupler.
 
Last edited:
i found this circuit
**broken link removed**
i tested it in protues and it work true.but where is a problem in reality.
in protues first time when i run it, output is off (i want it) but when i make circuit and connected voltage,first time output if on.i became confused.plz help me. :?:
 

CD4027
These type flip-flops are edge sensitive to the clock input and change state
on the positive-going transition of the clock pulses.
**broken link removed**

The basic J-K Flip-flop
**broken link removed**
 
i think that flip flop has not specified behavior in start time.if i think wrong,please help me to found way for solving this problem.
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top