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VTL5C1 Datasheet(PDF) 68 Page - PerkinElmer Optoelectronics |
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VTL5C1 Datasheet(HTML) 68 Page - PerkinElmer Optoelectronics |
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68 / 76 page  63 Application Notes—Analog Optical Isolators Figure 5. Peak Sensing Compressor with Constant Bandwidth Variable bandwidth can be avoided if the AOI is used in a voltage divider circuit at the input of a fixed gain amplifier. For the same range of input signals, the amplifier gain must be 500 and the voltage divider must have a range of 1000:1. This configuration is shown in Figure 5. The AOI has been changed to a lower resistance unit to be able to work over the wider range. Also, A1 is now a high input impedance, non-inverting stage to avoid a high insertion loss. This circuit is useful when the input voltage is high, which allows the use of a lower gain amplifier. Speaker Power Limiting Speakers that are driven from high power amplifiers must be protected from excess drive. While ordinary program levels may be well within the rating of the speaker, peaks do occur that can be destructive. The simplest solution is to use a compressor or limiter. Unfortunately, the maximum power that may be applied is not constant over the frequency range. Therefore, the limit must be set to provide protection at the lowest frequency that is expected. To understand the requirements for effective speaker protection, a brief review of speaker power limitations follows. Figure 7 is a typical maximum sine wave voltage limit for a low frequency speaker commonly called a “woofer”. Above 200 Hz, the maximum allowed voltage or power is constant. The operating temperature at which wire insulation and coil bonding fail establishes this value. Below 200 Hz, the voltage limit is determined by the allowable diaphragm excursion. For constant voltage on the speaker, the displacement doubles when the frequency is reduced by half. The maximum displacement is determined by the mechanical design of the speaker and exceeding the limit will produce extreme distortion and may even cause mechanical damage. Figure 7. Maximum sine wave Voltage and Power for a Typical Woofer |
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Similar Description - VTL5C1 |
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