Design a BJT differential amplifier to amplify a differential input signal of 0.25 V and provide a differential output signal of 2.5 V. To ensure adequate linearity, it is required to limit the signal amplitude across each base-emitter junction to a maximum of 6 mV. Another design requirement is that the differential input resistance be at least 500 k2. The BJTS available are specified to have ß> 100. Give the circuit configuration and specify the values of all its components.

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Photoelectric

The photoelectric effect occurs when light (or similar incident radiation, including X-rays) falls on material together with a metal plate and causes it to emit electrons. The discovery of the photoelectric effect led to important new theories (and to a Nobel Prize for Albert Einstein). Photoelectric cells, or photocells, are utilized in burglar-alarm light detectors and garage-door openers (each employs a through-beam of light this is broken when something movements throughout it), and also to play soundtracks on film movies (in which a light beam shines through the soundtrack encoded at the film and is "read" with the aid of the photocells).