supply of electronics equipment-2 scr commutation chopper trainer kit ( class b& class d ) n- natural commutation – 24v ac power supply, dc triggering n- current commutation – 24v dc power supply, pulse triggering, rlc components n- complementary commutation – main scr and auxiliary scr, 2 nos. of dc triggering n- resonant commutation – 24v dc power supply, pulse triggering, discharge circuit to facilitate to trigger again n- voltage commutation – 2 nos. of scrs as on and off switches, provision to charge the capacitance which will be used for voltage commutation n 3 single phase half and fully controlled bridge converter with rl load n - single phase half and full bridge power circuit n- firing circuit consists of phase angle control circuit using tca 785 n- triggering circuit from the output of tca 785 using pulse transformers n- vary the conduction angle and plot the output voltage n- r or rl load n- 24v, 2a power supply for the power circuit n- necessary dc power supplies for the control circuits n 4 open loop speed control of 1øac motor n- carrier wave generation and modulation signal generation n- pwm generation according to the sine wave, n- variable voltage ( modulation index ) n- driver circuit and 4 nos. of individual power supply for gate trigger circuit n- h bridge power circuit using mosfet / igbt n- ¼ hp 230 v single phase ac motor n- 20 hz to 60 hz frequency variation, accordingly speed control n 5 lamp control circuit using diac & triac n- variable ac power circuit using triac n- diac circuit to trigger the triac in both half cycles n- provision to vary the charging time of capacitor ( changing the phase angle also ) for the diac n- isolation transformer for 110v ac, lamp load n 6 smps using mosfet / igbt trainer kit n - ic based pwm controller n - mains voltage to 12v dc voltage conversion n - 32 khz oscillator n - power mosfet as switch n - fly back converter with isolation transformer n - output circuit n - feedback circuit n 7 single phase parallel inverter using mosfet n - single pulse 50 cycles generation n - monostable time delay circuit both half cycles n - parallel inverter configuration n - 24v ac output n - lamp load n 8 dc chopper control circuit using thyristor n- ramp generation circuit- level translation circuit n- comparator circuit to produce pwm signal monostable circuit n- chopper power circuit using main scr and aux ntrigger circuit for two scrs with pulse translation- necessary dc power supply n 9 single phase – single phase cyclo convertor n - with divide by two supply frequency n - power circuit using center tapped 24 v transformer and 4 nos. n - resistive load positive and negative polarity zero crossing detector n - separate 4 nos. of dc power supplies n - trigger circuits to trigger the gate circuits of power scrs n 10 universal motor control circuit with fraction hp universal motor n- control scheme for phase angle control using tca 785 scr / triac n- scr / traic ac power circuit n- fraction hp universal motor with plug n- built in power supply n 11 pwm based step down chopper using mosfet n- square wave generator integrator to generate the ramp n- comparator with dc voltage as one input mosfet switch n- small dc motor as load 12 half wave and full wave controlled rectifier with r load n- half wave controlled rectifier circuit n- phase angle control potentiometer n- provision to connect r l load n 13 single phase single pulse inverter using mosfet / igbt n- single phase 50 cycles generation n- variable duty cycle generation on both half cycles n- h bridge power circuit using 4 nos. of mosfet n- 4 nos. of individual power supply for gate trigger circuit n- 230v ac output n 14 step up chopper using mosfet n- output voltage vs duty cycle n- load characteristic without feedback n- load characteristic with feedback n- output voltage vs input voltage with feedback n- necessary power supply n 15 line synchronized ramp trigger using ujt with ac load n- dc power supply circuit n- ujt relaxation oscillator circuit n- provision to add dc pedestal voltage to the capacitor in the circuit n- triggering circuit for two scrs using pulse transformer n24v lamp ac load using two scrs n