Ac Stabilizer Circuit | Triac Controlled Automatic Voltage Stabilizer

 This triac control AC voltage stabilizer circuit has been design, the voltage switching transitions are very smooth with minimum wear and tear, resulting in efficient voltage stabilization. Discover the whole construction procedure of this unique, solid state mains voltage stabilizer.
The proposed circuit of a triac controlled AC voltage stabilizer will provide an excellent 4 step voltage stabilization to any appliance at its output. With no moving parts involved its efficiency is further enhanced. Find out more of this silent operator: power guard.The circuit of an automatic voltage stabilizer discussed in one of my previous articles, though useful, due to its simpler design, does not have the capability of controlling the different levels of varying mains voltages discretely. The proposed idea though not tested, looks pretty convincing, and if the critical components are properly dimensioned, should work as expected.
The present circuit of triac controlled AC voltage stabilizer is outstanding in its performance and is almost an ideal voltage stabilizer in every respect. As usual the circuit has been exclusively designed by me. It is able to control and dimension the input AC mains voltage accurately through 4 independent steps. The use of triacs make it sure that the changeovers are quick (within 2 mS) and with no sparks or transients usually associated with relay type of stabilizers. Also since no moving parts are employed, the entire unit becomes completely solid state and almost permanent.

CAUTION: EACH AND EVERY POINT OF THE CIRCUIT PRESENTED HERE MAY BE AT AC MAINS POTENTIAL, THEREFORE EXTREMELY DANGEROUS TO TOUCH IN SWITCHED ON POSITION. UTMOST CARE AND CAUTION IS ADVISED, USE OF A WOODEN PLANCK UNDER YOUR FEET IS RECOMMENDED. NEWBIES PLEASE KEEP AWAY.

Mains High and Low Voltage Protector Circuit, Using IC LM 324

The inclusion of op amps makes the circuit operations much accurate and tripping points adjustable to any levels as desired by the user.
As shown in the figure, we can see two OP amps from the IC LM 324 are used for the required detection.

Refer circuit diagram

 The upper op amp has its non inverting input rigged to a preset and is terminated to the supply DC voltage, pin #2 here is provided with a reference level, so that as soon as the potential at pin #3 goes above the set threshold (by P1), the output of the op amp goes high.

Quite similarly the lower op amp is also configured for some voltage threshold detection, however here the pins are just reversed, making the op amp output go high with low voltage input detection.

Therefore, the upper op amp responds to high voltage threshold and lower op amp to low voltage threshold.
For both the detections, the output of the respective op amp becomes high.

Diodes D5 and D7 make sure that their junction produces a common output from the op amp output pin outs. Thus whenever any one of the op amp output goes high, it is produced at the junction of  D5, D7 cathodes.