Flip flop or bistable multivibrator
Flip flop or bistable multivibrator
(OP)
I have a system that requires a positive and negative air flow that I'd like to control with a flip flop. Meaning that one state (say the vac or negative air flow) would remain on until switched to a positive air flow, which would remain positive until the next switch and so on.
I'd like to find an 'off the shelf' version that has a relay built in, so that I can use it run a solenoid valve.
Any ideas, sources, or maybe I'm looking at the system wrong. If there is an easier way, let me know.
I'd like to find an 'off the shelf' version that has a relay built in, so that I can use it run a solenoid valve.
Any ideas, sources, or maybe I'm looking at the system wrong. If there is an easier way, let me know.





RE: Flip flop or bistable multivibrator
However, when you say ".... which would remain positive until the next switch and so on" do you mean that the last setting must be remembered between successive operations of the system without any electrical power applied?
If so, one suggestion would be using a single magnetic latching relay. These usually have two coils (or sometimes just one coil where you have to reverse the polarity) and can be switched like a bistable by applying a short d.c pulse to one coil or the other. One coil flips the external circuit contacts one way, then applying a pulse to the other coil when required flips the contacts back the other way. In both cases the contacts are held in the last state without consuming any power by small magnets within the relay's construction - quite neat really.
RE: Flip flop or bistable multivibrator
Thanks again