i'm designing a project. i want to use a 555 timer ic to activate a relay and the relay remains stable. i know some other circuits will be involved apart from the 555 timer. please how do i make the relay stable after activating it with the 555 timer?. thanks.
i'm designing a project. i want to use a 555 timer ic to activate a relay and the relay remains stable. i know some other circuits will be involved apart from the 555 timer. please how do i make the relay stable after activating it with the 555 timer?. thanks.
In that case connect the relay coil between output and ground, rather than output and +ve (or should that be the other way round?). In any case, you can connect the relay coil to work either way.
this is the project: i want to use a remote to activate a fan. if i use the 555 in a monostable way, it will activate the relay and remain stable untill the 555 times out as a result of the delay. now i want something that will be stable permenently utill i press another button to deactivate it. the circuits consists of an infrared transmitter and reciever. the reciever passes an impulse to the trigger (pin 2) of the 555 and then the output (pin 3) activates the relay. but how to make the relay remain permenently in that activated state is where the problem lies. contribution please..............!!!
Hi L. Chung,
Transistors work when backwards, most Noobies find out. :shock: :shock:
Their gain is poor when backwards but they switch OK if you use a high base current. Since their base-emitter junction will avalanche when reverse-biased at about 6V to 7V, it is in series with a forward-biased collector-base junction so the supply voltage of the circuit should be less than 6.6V to 7.6V. :lol: :lol: