![]() The arc volume is hotter at current zero for the 60-Hz arc than for the 50-Hz arc. The 60-Hz current is higher than the 50-Hz current in the last critical microseconds of the arc. Mayr's model applied to low-voltage device circuit interruption predicts that 60-Hz current is harder to interrupt than 50-Hz current and experimental data verify this result. The thermal properties of the arc from Mayr's model are investigated for low-voltage devices such as relays and motor starters. The resulting mathematical models of the arc have been applied by others to various arcing structures, usually large circuit breakers, and have had good success in predicting performance of the arcing devices for both high currents using Cassie's model and low currents using Mayr's model. I do not get any output out of Pin 1, regardless of the configuration.Mayr and Cassie made assumptions about thermal properties of arcs about 40 years ago. I've tried putting 6 to positive and 7 disconnected, 7 to positive and 6 disconnected, I've even tried connecting the positive of a AA battery to it (when doing so I connected the neg on the 9V and the neg on the AA, is that okay?). Pin 1: is connected to a resistor, and that resistor to the negative of a 9V battery Here is the datasheet: **broken link removed** With access to the datasheet, I still can't figure out how I'm supposed to get it to work. ![]() I went to Radio Shack and bought an LM339N comparator. My first thought was to research some type of thresholding device, so that 0V meant blow the horn, and 5V meant shut it off. but the voltages given out by the alarm clock are insufficient to trip the relays I have, and I haven't found one online that could provide a dropout voltage of ~1.5V. The device to make the sound draws so I need to run it off a relay. I have soldered some points to the alarm clock so that when the horn should go "beep" it outputs 1.5V, and when it should be off or intermittent, it is outputting 5V. I have an alarm clock which I am trying have beep a horn instead of the built in speaker. ![]()
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