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Line voltage regulator with RMS voltage approximation feedback control
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Oven temperature control circuit
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Cascaded arrangement for electrically heating fluids to high temperature
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Low mass flexible heating means
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Heat station for a heat sealing system
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Heating device for sealing material to effect different bond strengths
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Seam sealing device and technique
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Controller for a multiple stage power device having interchangeable control units
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Self synchronizing zero crossover switching circuit
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Zero crossover switching circuit
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Temperature control apparatus employing heating and cooling control circuits arranged in a head to toe configuration
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Temperature control apparatus with a cyclical distributor
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Circuit for monitoring a temperature related condition and for controlling a heat generating device
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Temperature control system with isolated control circuit
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Proportional temperature regulation system
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Temperature regulating system
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Temperature control circuit with photosensitive coupling to output load
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