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Raychem/TE Connectivity RXE050 0.50A Polyswitch
is this what I need?
i have a pair of Behringer B1220DSP powered cabinets. the RMS power to the horns is 80W, going on my second set of horn diaphragms ($) and would like to add some protection. I like the idea of something that resets automatically, but I like the idea of the light bulb too... Help!
The bulb really does a different job than these. It's resistance increases as the current passing through it reaches the filament's thermal-inertial threshold. In short, it compresses the signal as it gets louder. This polyswitch simply cuts off when it's max current is reached. There are drawbacks to either approach. However both can be used simultaneously, and the goal there is to use a polyswitch with a max current just below the point where the bulb's compressive effects become very noticible. This requires some experimentation to get right, but the results are pretty remarkably and very effective at preventing driver failure.
Date published: 2012-01-01
This tweet is rated for 30wrms. .5 amp across 8ohms is only 4 watts. How much peak power will this pass, and how fast will it open?
30 watts @ 8 = 15.5 volts x .5 amp rating = 7.75 watts,no you need something closer to 2 amps. Check out ohm's law for more details.The rest is very complicated as it all has to be defined.Peaks of less than a few 100 milliseconds are usually meaningless.That rms rating is the "gold" standard.It denotes a "standard" that is averaged, peaks of up to 10 db,in this case 300 watts@100 ms.,are taken into account.Play it safe and start by underrating by at least %25 if unsure of the speed, however these devices tend to be fast averaging as opposed to having peak power ratings.
Date published: 2013-04-20