Given the circuit in Figure 1, calculate the dc voltages with respect to circuit

Question

Given the circuit in Figure 1, calculate the dc voltages with respect to circuit common, and collector current, as cited in the table below. Enter the calculated values in Table 1 on the worksheet.

Calculate Voltages Below

Voltages (V)

Voltage from emitter to common (VE)

Voltage from collector to common (VC)

Voltage from base to common (VB)

Calculate: Voltage drop between collector and emitter (VCE)

Calculate: Voltage drop between base and emitter (VBE)

Voltage across the collector resistor (R2)

Calculate Current Below

Current (mA)

Collector current

Calculate Voltages Below

Voltages (V)

Voltage from emitter to common (VE)

Voltage from collector to common (VC)

Voltage from base to common (VB)

Calculate: Voltage drop between collector and emitter (VCE)

Calculate: Voltage drop between base and emitter (VBE)

Voltage across the collector resistor (R2)

Calculate Current Below

Current (mA)

Collector current

Explanation / Answer

in dc mode open all capacitors due to high impedence the beta (current gain for Q 2N3904 is 100) the thevenin model will be with Vth = 9*10/57 = 1.58V Rth = 10||47 = 8.25Kohm now let consider vbe to be nearly 0.6 volts then kvl from base to emitter Ib = (1.58-.6)/(8.25+101*470) = 17.5 uA hence collector current Ic = 100 * Ib = 1.75mA Vc=9-1.75*2 = 5.5V Ve= .470*1.75 = .822 V Vb = 0.6+.822 = 1.422 V across R2 is 3.5 V Vce = 5.5-.822 = 4.678V

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