7805 R21 PHASE 1 RELAY 1N4007 TIFIER 10k NC U1B 2K2 8K2 2k2

7805 R21 PHASE 1 RELAY 1N4007 TIFIER 10k NC U1:B 2K2 8K2 2k2 ED-YELLOVW a +5V REGULATED bEAROUND +12V Yphase LED-GREEN 470u 4700u BC547 10k 2k2 1N4007 3CIO RELAY RL4 12V R24 NO NO NO RY B N 4007 NC THREE PHASE SUPPLY from the PCB connector LED THERMISTOR 2k2 PHASE1--RED WIRE---R R25 PHASE2 YELLOW WIRE Y BC547 2k2 THREE PHASE SUPPLY D22 LED-RED 10k PHASE3--BLUE WIRE---B LM339 NEUTRAL--N 10k 10k N of the transformers to be given to Neutral Direct N4007 R,Y,B connections to Transformer to given from here

Solution

Given y-phase=12V A.C , R-Phase = 12V A.C , B-Phase = 12V A.C

To calculate the voltage and current across the each resistor we use can use ohms law(V=IR) and to calculate the input voltage of op-amp we use the voltage at the input terminal of the op-amp i.e difference in the input terminal and the output voltage of an op-amp will be the feedback path voltage or output voltage.

The input voltage to transistor the voltage drop at resistor R₃ ,R₇ , R₁₁ , R₁₃

CALCULATION PART:

R₁ = 10K ,   Voltage 12V   ,    I =V/R   =1.2A

R₂ have same value of resistance and voltage and current remains tge same.

op-amp 1 : Input voltage = 12V - 5V = 7volts

                  Output voltage = 12 volts

R₃ = 10K   ,voltage = 12K   ,I = 12/2 =6A

R₄ = 10k   , I = 1.2A

op-amp 2 and 3 has the same voltage and current.

Voltage and Current across transistor

voltage = 12V    and I = 6A