For the following circuit: 2000 5V audio in ' a) If the variable resistor is set...

 

Transcribed Image Text:

For the following circuit: 2000 5V audio in ' a) If the variable resistor is set to 10k2, what is the current, I, flowing into the base of the transistor when the audio signal is loudest (~1V)? (Note that the voltage drop between the base and the emitter is 0.7V just like for most any silicon junction diode). b) Assuming that the of our transistor is -100 (a fairly typical value). What is the resulting collector current, Ic, flowing into the collector? c) What is the voltage drop across the 2002 resistor with this collector current? d) What is the resulting emitter current, I? e) Suppose you want to maximize the brightness of your LED by increasing the collector current to 20mA (a typical max value for LEDS). To what value must the variable resistor be set? f) If you wanted the LED to respond only to the midrange, what type of filter (High Pass, Low Pass, Bandpass) do you need to put before the amplifier input? What would appropriate cutoff frequency or frequencies be? For the following circuit: 2000 5V audio in ' a) If the variable resistor is set to 10k2, what is the current, I, flowing into the base of the transistor when the audio signal is loudest (~1V)? (Note that the voltage drop between the base and the emitter is 0.7V just like for most any silicon junction diode). b) Assuming that the of our transistor is -100 (a fairly typical value). What is the resulting collector current, Ic, flowing into the collector? c) What is the voltage drop across the 2002 resistor with this collector current? d) What is the resulting emitter current, I? e) Suppose you want to maximize the brightness of your LED by increasing the collector current to 20mA (a typical max value for LEDS). To what value must the variable resistor be set? f) If you wanted the LED to respond only to the midrange, what type of filter (High Pass, Low Pass, Bandpass) do you need to put before the amplifier input? What would appropriate cutoff frequency or frequencies be?