solenoids-a miniature latching (remanence) solenoids employing permanent magnets allowing the solenoid to be retained in the set position without consuming any power.Pulses of typically 40ms duration will operate and reset both ranges. 12v
a miniature PCB mounting solenoid.6V
profile of just 12mm height. ideally suited to pulse driven applications
this one was slightly more delicate and got very hot very quickly.
i started out by hooking the solenoid up to a larger power supply just to get a feel for what it did. when the voltage was turned on, the force was very strong and i could not pull the metal cylinder out with my hands.
when the voltage is off the cylinder is pulled back into the solenoid body by a magnet located at the end of component.
i then began to think about how to attach the spring to the solenoid.
next step was to get solenoid into my typewriter so i could create a code to make solenoid pull the spring to force an action on one of the individual keys.
when looking more closely. the space below the keys was quite limited to began to take the typewriter apart. tricky.
i needed an individual key to work with. i chose the key nearest the outside as to not complicate things.
initially i was going to drill a hole at the top end of the metal so i could attach the spring securely.
at this stage the conclusion was drawn that there was not enough space for the solenoid at all. an option would be to create a new housing for the typewriter to create more depth. i felt that was slightly complex for the sake of small test piece.
i then realised the key i had chosen at the end was not a key used for typing words. it was used as a back space key. time to move on...
the rods and springs controlling the key were worked beautiful. although very mechanically.
i simple attached a wire around one of the rods. creating the effect of my pulling on the wire made the key work. very simple but satisfying.
looking more closely at the keyboard and with seans intelligent input. thanks for your help today sean. i had the idea of shifting the solenoid to the other side of the keyboard at the capital key. if i could get it to work with this key i could create the random capitaliser.
wiring the solenoid into the capital key could have good effect for a protoype.
the space under the key was very small so we took away some of the components above to make more room.
this is the space where it would be mounted.
the next step was preparing the solenoid component and figuring out which one to use etc.
i soldered two wires ( one red & one black) onto the two coil pins.
i set up my first test rig. happy. thank you to jon for helping me. the solenoid was attached by small screws to a piece of scrap wood and then a suitable spring was attached from solenoid to a screw. i placed another screw further along to stop the solenoid snapping all the way in.
a fet transistor is used in the circuit when solenoids and various other components are in use.
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