Hi Since i require two separate Bistable timers that can be set and reset independantly i am using the Ne556 timer.
I have connected the pins in the following manner.
Pin1 or pin 13- Disch pin:- Not connected ( floating)
Pin 2 or pin 12 - Thresh :- connected to Ground directly
Pin 3 or pin 11 :- Control :- connected to ground via 10nF capacitor
Pin 4 or pin 10 :- Reset :- Connected to VCC via a 1.8 Kilo ohm resistor.
pin 5 or pin 9 :- output :- connected to optocoupler that is used to turn on a relay.
Pin 6 or pin 8 :- Trigger:- Connected to VCC via a 1.8 Kilo ohm resistor.
Pin 7 :- Ground:- Connected to ground pin.
Pin 14:- VCC:- Connected to +12V supply
That is i have connected each of the timers independantly to function as a bistable multivibrator. Now when i trigger and reset the individual timers they set and reset without any issue. I.e if i make pin 6 low then pin 5 goes high and if i make pin 4 low pin 5 goes low. Simillarly with the second timer pin 9 goes high when pin 8 is low and is reset when pin 10 is low. Now the problem i am facing is that i cannot make both pin 5 and 9 high simultaneously. If i make pin 5 high first by making pin 6 low then the moment in make pin 8 low pin 9 goes high and pin 5 goes low.
Can anyone tell me why this is and if i can solve this so that i can have both Pin 5 and 9 high simultaneously.
Please note that to make pins 4,6,8 and 10 low i am using a push button .Hence they are low only for a few milli sec. as i press and release the push button.
Thank you
Khirad
