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Hearth
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First, they were first. As a useful photoresistive material, cadmium et. al. predates silicon devices by decades. Second

Second, they are not semiconductors. This is one of the main reasons why they are still in demand in areas such as professional audio. Third

Third, the property change (resistance in this case) from dark to light (dynamic range) is huge. This means that many applications do not need any amplification or other signal processing. Fourth

Fourth, they can be made to handle high (compared to silicon devices) voltages, such as offline TRIAC gating. Fifth

Fifth, reliability.

First, they were first. As a useful photoresistive material, cadmium et. al. predates silicon devices by decades. Second, they are not semiconductors. This is one of the main reasons why they are still in demand in areas such as professional audio. Third, the property change (resistance in this case) from dark to light (dynamic range) is huge. This means that many applications do not need any amplification or other signal processing. Fourth, they can be made to handle high (compared to silicon devices) voltages, such as offline TRIAC gating. Fifth, reliability.

First, they were first. As a useful photoresistive material, cadmium et. al. predates silicon devices by decades.

Second, they are not semiconductors. This is one of the main reasons why they are still in demand in areas such as professional audio.

Third, the property change (resistance in this case) from dark to light (dynamic range) is huge. This means that many applications do not need any amplification or other signal processing.

Fourth, they can be made to handle high (compared to silicon devices) voltages, such as offline TRIAC gating.

Fifth, reliability.

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AnalogKid
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First, they were first. As a useful photoresistive material, cadmium et. al. predates silicon devices by decades. Second, they are not semiconductors. This is one of the main reasons why they are still in demand in areas such as professional audio. Third, the property change (resistance in this case) from dark to light (dynamic range) is huge. This means that many applications do not need any amplification or other signal processing. Fourth, they can be made to handle high (compared to silicon devices) voltages, such as offline TRIAC gating. Fifth, reliability.