A cool little gizmo from my bins that deserves its own little video. Enjoy!
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#relay #logic #vintage
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#relay #logic #vintage
- Music by Fran Blanche -
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Fran on Twitter - https://twitter.com/contourcorsets
Fran's Science Blog - http://www.frantone.com/designwritings/design_writings.html
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I probably still have an old mechanically (not magnetically) bistable 220V relay somewhere in my collection. It's two coils pulling a mechanism that's kept in it's state by a spring mechanism similar to a wall switch.
modern latching relays use magnetic remanence, but are limited in the size of contact they can operate and AFAIK use only DC coils. These dual types can switch the load directly. In Europe they were made by the German company Kuhnke.
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mechanically bi-stable
Excellent
What a beauty! 1 bit of information. And yes, I agree: "it is very pleasing"
good ole' latching interval relay. I've seen these used to alternate pumps and compressors in industry.
Is a manual push-push on off switch not a flip flop ?
Or an on/off switch of any kind ?
Mechanically interlocked relays were common but generally arranged in such a way that both cannot be 'on' at the same time.
Would you still call it a flip flop if you removed a solenoid and replaced it with your finger ?
Such as the keys on a teletype terminal – prod a key with the finger, they're mechanically held down until released by the energising of a solenoid. Ditto some lift buttons.
I love it! I made a counter out of relays when I was in high school, probably spring 1969. It didn't work nearly this well. Mine was very sensitive to contact spacing. I learned later about wrapping the coils in copper to make them release more slowly, when working with Strowger switches (step-by-step switches, early telephone switching equipment).
I had hoped to make a small computer out of it, but of course, w/o reliable switching, and, most importantly, money…
Me likey!
An electro mechanical memory, no power required to hold a state, neat invention Gaz UK.
An assembly that looked very much like yours, and worked the same, was used in mechanical traffic signal controllers from the 1960's. We called it a latch relay, and it was used to receive a pulse which told the controller to run a different timing plan. For instance, morning rush hour, normal, and evening rush hour. In the case of my city, Des Moines, Iowa, pulses were sent over leased telephone lines from a central location, to the signal controllers scattered all over town at each intersection. An electro-mechanical device called a responder decoded the ~70 vdc pulses from the phone lines into one of three outputs, and sent the result to your latch relay, which powered the appropriate timing motor of the controller. Whew.
The term "flip flop". Should be a clue. Flipping and flipping are physical actions and nicely describe this device. When we moved to electronic memory, we retained the old terms.
It's like talking about dialing a phone. At one time it referred to physically turning a dial rather than pushing buttons or a tocuhscreen, but we've retained that old usage, although I suspect not for long.
It seems like a mechanical multivibrator.