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In Reply to: RE: Ping: DAK posted by Triode_Kingdom on June 24, 2017 at 14:57:59
Many years ago, the resident engineer at Lafayette Radio's 100 6th Ave. NYC store, Bob Murray, taught me about rotary switches. Break before make is non-shorting. Make before break is shorting. The cumulative connection of contacts is sequence shorting.
Mr. Murray used his hands to illustrate what goes on. The index finger of 1 hand bouncing from finger tip to finger tip, for non-shorting. The index finger sliding from a tip into the gap between 2 tips and on to the 2nd tip, for shorting. The curved finger advancing along the tips, never loosing contact with a tip once connected, for sequence shorting.
Now that you say that, I do seem to remember seeing "sequentially shorting" many years ago, applied to rotary switches. Somewhere along the way, I must have erroneously associated "shorting" with that function. Do you know if there's a term for a switch that shorts all the contacts to common except the one at the selected position? Heathkit used wafers of that type in older selector switches to short unused inputs to ground. It's very effective at eliminating bleed-through.
Buy Chinese. Bury freedom.
I don't know what that's called but yeah, used to be used on selector switches to do things like ground all the inputs except the one you want. Cuts down on cross-talk I suppose. Some of those early selector switches were an engineering marvel, but also a service call just waiting to happen. Maybe one of the most useful tools of old TV Repairmen was a can of "Tuner Cleaner"!
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