Simulation Homework 2, due Friday week 4 - Milwaukee School of ...

2when the voltage of either polarity between the terminals exceeds the breakdown voltagefor which the diac was designed. Diac turns off when the current falls below the holdingcurrent level, or practically, when the current tries to reverse direction.In this simulation, we will build a simple diac test circuit shown in Fig. 2.1 in order toverify the diac breakdown voltage. Diacs have poorly controlled breakdown voltage sothat a nominal 24V device may actually have a breakdown voltage anywhere between20V and 28V. The AC source applies a voltage from – V rms2 to V rms2 , while theresistor R1 limits the current when the diode turns on. By observing the voltage directlyacross the diac we can determine the breakdown voltage.FIGURE 2.1 :TEST CIRCUIT FOR DIAC BREAKDOWN VOLTAGE.a) Build the circuit in Multisim and use Simulated Agillent Oscilloscope tomeasure AC source voltage on Channel 1 and diac voltage on Channel 2,as shown in Fig. 2.1. Diac 1N5759 can be found in Master Database->Diodes ->Diacs.b) Use the switch in the upper left corner to start the simulation. Use Quick Measurementbutton on the scope to find the maximum value of the voltage across the diac.c) Provide a printout of the scope display showing both waveforms and themaximum diac voltage measurement.d) What is the value of the diac's breakdown voltage?