Electronics
Rectfier waveforms Half wave rectified Vrms = Vp / 2 Vdc = Vav = Vp / π Full wave rectified Vdc = Vav = 2Vp/π Vrms = Vp/√2 3 phase full wave Vdc = Vav = Vp(3√3/π) = 1.65Vp RMS voltage (all symmetrical around zero volts except pulse) sine wave Vp/√2 square wave Vp triangle wave Vp/√3 Sawtooth wave Vp/√3 Pulse train Vp√D where D is duty cycle, percent time spent high To add a DC offset(Vd) to a waveform Vrms = √(Va² + Vd²) where Va is the RMS of the waveform. Junction Transistor Amplifier Common Emitter (β = HFE) input Resistance Rb = 25β/Ie (Ie in ma) This is paralleled by the bias resistors Voltage gain Av = RʟIe/25 (Ie in ma, Rʟ in Ω) Output resistance is Rʟ Common Emitter with emitter resistor This allows you to set the gain by omission of the bypass cap on all or part of Re. input Resistance Rb = REβ + 25β/Ie (Ie in ma) This is paralleled by the bias resistors Voltage gain Av = Rʟ/RE (note 1) Output resistance is Rʟ Common Collector (emitter follower) input Resistance is Reβ This is paralleled by the bias resistors Voltage gain Av = approx 1 Output resistance is the source R/β where source R is the output R of the previous stage in parallel with Re Common Base input Resistance Rb = 25/Ie (Ie in ma) Output resistance is R∟ Current gain = 1 Note 1. Above is for gain < maximum. Full expression is βRc / ((β+1)RE + Rb) Rb = 25β/Ie (Ie in ma) |
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