These plug into the wall and the neon tube is powered by a small step -up transformer delivering 3,000 to 6,000 volts. They were also sold for home use and often turned up in thrift shops. and a demonstration of why snubbers are useful.Ī few decades ago one would often see small neon beer signs in bars. I'm assuming it's a special order item - with high voltage insulation - and probably potted in a block of rubber or epoxy.Īs an entertaining aside. So that inductor must tolerate up to 6,000 V across it or between it and the surrounding metalwork. The inductors used in a speaker crossover never see much voltage - and probably actually carry a 300V or 600V or lower insulation rating.Ī BrickWall surge suppressor is expected to block surges of UP TO 6,000v. In the case of a surge suppressor the significant specification for the inductor is going to be VOLTAGE. (It's usually a small value high voltage capacitor - for example 0.1 / 1000v - although some circuits use diodes - or both.) Snubbers are almost always used when switching inductive loads - like electric motors and relay coils. (This is how flyback transformers and buck regulators work.)Ī snubber circuit prevents this voltage buildup by providing a path for the resulting short pulse of current. Here's a detailed explanation of what a snubber is and does:īasically, an inductor acts sort of like a flywheel for electrical current, and "opposes sudden changes in current flow".Īs a result, if you attempt to suddenly interrupt the current flowing through an inductor, you can get a significant voltage spike across the switch. ![]() (Note that there are other important specifications in this case.) I believe the small primary filter cap is 2 uF and the three larger secondary ones are 180 uF. I have seen values listed for the caps in some descriptions.
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