Ravi Yantra: Ravi rules over heart, soul and dignity. Ravi governs eye sight, influence in society, popularity, heart and relationship with father or higher officers.  Ravi afflicted will cause hot diseases,  humiliation, wrath of the ruler or government.  As ravi is a cruel planet, he causes rifts with the people represented by the house. He also confers highest offices in the government. A strong ravi in  the chart makes the native an able administrator. When in debilitation sign Libra,  he would cause imprisonment, humiliations, severe circulation problems, neurological and eye related problems, loss of or loss due to father. Those who have Ravi in Capricorn, Aquarius, Libra, ravi owning or placed in bad houses and who have 6 to 8 relationship with the present dasa lord should worship ravi yantra.  Ravi bestows abundant energy, royal favours, high posit ion in the government, clear thinking, ability to recite mantras with correct pronunciation, great popularity among masses. The worship of this yantra should start on Sunday. The mantra for ravi ("OM HRAAM HREEM HROUM SAHA AADITYAYA NAMAHA") is to be chanted on Sunday morning at sunrise minimum 18 times.  The worship of the yantra is similar to any worship of Gods say Ganeshji. It is not black magic. 

Chandra Yantra: Chandra rules over eyes and mind. Chandra governs impregnation, conception, child birth, infancy.  Badly disposed Chandra causes ill health to the infants (called balarista) and also pre and post delivery problems to the mother. Water related diseases like cold diseases (throat troubles, asthma,  bronchitis etc.,) vomiting,  Mental problems (fickle mindedness, anxiety neurosis, depression, mysterious fear and pessimistic nature, poor concentration, hysteria, insanity, drifting of interest), infatuation with opposite gender,  lack of  commitment, eye disorders,  varicose veins, audition to drinks an drugs. Those who are having Chandra in the worst placement Chandra in vrischika rasi or having the ownership over bad houses or Chandra being in 6 to 8 relationship with the present dasa lord should worship Chandra yantra. For the blessings of Chandra one worship this yantra. Chandra bestows mental tranquility, good child birth, relief from cold and mental problems, promotions and for linguistic and artistic talents. The worship of this yantra should start on Monday. The mantra for chandra ("OM SHRAAM SHREEM SHROUM SAHA CHANDRAAAYA NAMAHA") is to be chanted on Monday morning at sunrise minimum 18 times. 

Kuja Yantra: Kuja represents martial arts, engineering skills, policing, army and communication skills.  Depending on the position of kuja, the nature of energy he gives changes.  Kuja rules over animal instincts.  A kuja having good nature and strength gives self-confidence, tolerance, mathematical and logical mind, quick wit.  He gives muscular strength for a sports man.  Leadership, strong determination are given by kuja.  A bad kuja makes the native a foolishly argumentative person, adamant, quarrelsome and violent. Kuja in bad houses or in kataka rasi will cause bad effect.  There would be troubles through machines, tools and brothers/sisters of the native. The diseases that are caused by kuja are: burns, inflammatory conditions, wounds, abortions, ulcers, boils etc., Such a native would be at the extremes and would behave like an animal. Kuja is the significator of loans and a bad kuja would cause severe liabilities. Kuja in the 2nd, 4th, 7th, 8th and 12th houses from lagna, chandra and sukra would cause Kuja dosha (Chavai dosha).  South India is famous for Malasa Dossa and Chavai dos(h)sa!  Undue importance is being given to kuja dosha than needed.  If kuja in in own sign or exalted or if he is yogakaraka or if he is the lord over rasi/lagna or the 7th house,  the chart is EXEMPT from kuja dosha. Kuja dosha from lagna is more strong than the other two factors. Normally, kuja dosha is looked in the charts of the girls and not boys, as if the boys are above the planets! Another blunder that is being committed is to match the chart for "dosha samya" (equal flaws) in the charts of girl and the boy.  The argument is that if both have kuja dosha, the marriage will not be affected.  Two thieves put together do not make a policeman! Those who are having kuja in above conditions or  in 6 to 8 relationship with the present dasa lord should worship kuja yantra. The worship of this yantra should start on Tuesday. The mantra for kuja ("OM KRAAM KREEM KROUM SAHA BHOUMAAYA NAMAHA") is to be chanted on Tuesday morning at sunrise minimum 18 times. 

Budha Yantra: Budha rules nervous system and skin.  Wit, intelligence and quickness in grasping the subjects are due to budha.  A person with a strong budha can learn almost anything without a teacher due to his inquisitive nature. Worship of budha yantra gives intelligence, literary talents, administrative capabilities and success in agency work. A badly disposed budha in the evil houses or in meena rasi or owning bad houses gives argumentative nature, gambling and cunning tendencies, self-praising mentality.  Such a position of budha  gives laziness, diseases of nervous system, madness, stammering, depression, speech defects, skin problems, tuberculosis. The worship of this yantra should start on Wednesday. The mantra for budha ("OM BRAAM BREEM BROUM SAHA BUDHAAYA NAMAHA") is to be chanted on Wednesday morning at sunrise minimum 18 times. 

Guru Yantra: Guru makes a man generous.  He will be having social concern, un diplomatic and candid.  Wisdom, patience, high reasoning ability particularly in abstract subjects, ability to judge the situations and persons impartially are due to good disposition of guru.  Law, religion, social service, education are represented by a strong guru.  A strong guru bless the natives with good children. Afflicted guru makes the person fundamentalist.  A badly placed guru in makara or in bad houses or owning bad houses causes liver problems, jaundice, lower back aches, gastric problems, glandular malfunctions and problems due to children or bareness. Worship of guru yantra gives wisdom, professional higher education, good digestive power, success in professions involving analytical ability, social concern and blesses the worshipper with good children. The worship of this yantra should start on Thursday. The mantra for guru ("OM GRAAM GREEM GROUM SAHA GURAVE NAMAHA") is to be chanted on Thursday morning at sunrise minimum 18 times. 

Sukra Yantra: Shukra gives power of love, affection, fine arts, beauty and comforts.  For wealth, poetical and artistic talents sukra is the presiding deity.  Beautiful personality, melodious voice, attraction by and towards opposite gender and amusements in life are bestowed by sukra.  A badly situated sukra in kanya or in bad houses or owning bad houses causes drunkenness, womanizing nature, stones in urinary bladder,  female disorders, over indulgence in eating, drinking and other pleasures, diabetes, vehicular accidents and injuries and infidelity. Worship of sukra yantra removes the evil results and bestows political power, money power and also all riches.  The worship of this yantra should start on Friday. The mantra for sukra ("OM DRAAM DHREEM DHROUM SAHA SUKRAaYA NAMAHA") is to be chanted on Friday morning at sunrise minimum 18 times. 

Shani Yantra: Shani causes losses, failures and humiliations, dental or bone related problems, sudden accidents that result in fractures as well as relationship probelms.   He also protracts the diseases, litigations for considerable time. He humbles the person but it is not that he imposes penalties without discretion. It is common knowledge that even remedial measures for Shani does not take off easily.  Lord Shani should himself permit to do so!Either due to ignorance or wishful thinking, many would be reluctant to workshop Shani in the beginning of the problems. Ardastama shani (Shani in 4th from rasi), Saptama (in 7th), Astama (in 8th) and seven and half year cycle of Shani (in 12-1-2 from rasi) and whenever Shani Dasha /Bhukti is going on, it is desirable to worship Shani yantra. The intensity of problems as well as the outcome of remedial measures depends on the role of Shani in the natal chart like lordship and placement.  Worship of shani yantra removes all the above problems, restores stability in life and gives good life span.  The worship of this yantra should start on Saturday. The mantra for Shani (" OM PRAAM BPREEM PROUM SAHA SHANISHCHARAYA NAMAHA") is to be chanted on Saturday morning at sunrise minimum 18 times. 

Rahu Yantra: Vedic scholars well aware that there is no planet by name Rahu. Without telescopes they were able to time the eclipses and rahu swallowing ravi or chandra is merely a poetical expression. Rahu is called shadowy planet.  Rahu causes suddenness of the things.  Explosion, burns, snake bites,  poisoning and also bites by wild beasts, violent mind and caused due to rahu. It  also causes divorce, separation, loss of money due to thefts and cheating, diseases that are difficult to diagnose and hidden enemies.  Those people who have rahu in 2nd, 4th, 5th, 7th, 8th and 11th should worship rahu yantra. The worship of this yantra should start on Saturday. The mantra for rahu ("OM BHRAAM BHREEM BHROUM SAHA RAAHAVE NAMAHA") is to be chanted on Saturday morning at sunrise minimum 18 times. 

Ketu Yantra : Vedic scholars well aware that there is no planet by name Rahu. Without telescopes they were able to time the eclipses and ketu swallowing ravi or chandra is merely a poetical expression. Ketu is also called shadowy planet, chayagraha.  Ketu is also of malefic nature but he is not as malefic as Rahu.  Further, the problems inflicted by ketu make the person spiritually rich.  Ketu also causes sudden turn of events but they are somewhat anticipated or taken as 'expected behavior'. Skin and viral diseases, worms in the intestines,  insect bites like scorpions, centipedes,   food poisoning and also bites by canines and rodents, are attributed to ketu. It  also causes divorce, separation, loss of money due to thefts and cheating, diseases that are difficult to diagnose and hidden enemies.  Those people who have ketu in 2nd, 4th, 5th, 7th, 8th and 11th should worship rahu yantra. Ketu yantra helps spiritual growth and bestows  victory over enemies, favour from government and cure from  diseases caused by ketu. The worship of this yantra should start on Tuesday. The mantra for ketu ("OM STHRAAM STHREEM STHROUM SAHA KETAVE NAMAHA") is to be chanted on Tuesday morning at sunrise minimum 18 times. 

Maha Mrityunjaya Yantra: Mrityunjaya means the one who has conquered the death. This is another name of Lord Shiva, one of the trinities concerned with end.  This Yantra particularly relieves one from all dreadful diseases. humiliations or any problem which is equal to death. It dispels all sorts of fears, influence of evil spirits, curses, accidents etc. The worship of this yantra should start on Saturday. The mantra ("OM TRIYANBAKAM YAJAMAHE SUDHANSHIM PUSHTIVARDHANAM; URVARUKAMIVA BANDHANAAN MRITYOR MUKSHEEA MA AMRITAAT") is to be chanted on Saturday morning at sunrise minimum 18 times. There are specific mantras for invoking the deity of the yantras. After,  this  shodhasha pooja (sixteen varieties of pooja) with abhisheka (bathing with panchamrita - milk, curds, ghee, honey, sugar) is done. This yantra requires a sankalpa (commandment) that  " I am doing on behalf of so and so for that particular purpose on this day". You should mention name (for whom the yantra is required), father's name, gotra (family name), star and purpose for which the yantra is required in the sankalpa.

Lakshmi Nrusimha Yantra: After eliminating the demon king Hiranyakashapu, Maha Vishnu in the form of half lion and half human was still in angry mood.  To pacify the Lord, the Gods made His divine wife, Mahalakshmi to sit on his lap. Lakshminrusimha Yantra represent that mood of God which is rajasika.  When a humble servant is injured, he seeks justice and appeals to God for protection. This yantra is used as protection against humiliations and tabulations.  The worship of this yantra should start on Thursday. The mantra ("OM VAJRANAKHAAYA VIDMHE TEEKSHNA DANGASHTRAAYA DHEEMAHI; TANNO NAARASIMHA PRACHODAYAT") is to be chanted on Thursday morning at sunrise minimum 18 times.   

There are specific mantras for invoking the deity of the yantras. After,  this  shodhasha pooja (sixteen varieties of pooja) with abhisheka (bathing with panchamrita - milk, curds, ghee, honey, sugar) is done. This yantra requires a sankalpa (commandment) that  " I am doing on behalf of so and so for that particular purpose on this day". You should mention name (for whom the yantra is required), father's name, gotra (family name), star and purpose for which the yantra is required in the sankalpa.

Mahalakshmi Yantra: Mahalakshmi Yantra is intended for wealth of all kind and attaining comforts in life.  Mahalakshmi Yantra brings success and wealth through regular puja and mantra chanting. The worship of this yantra should start on Friday. The mantra ("OM MAHADEVYA CHA VIDHMAHE VISHNUPATNAY CHA DHEEMAHI; TANNO LAKSHMI PRADHODAYAAT") is to be chanted on Friday morning at sunrise minimum 18 times.  

There are specific mantras for invoking the deity of the yantras. After,  this  shodhasha pooja (sixteen varieties of pooja) with abhisheka (bathing with panchamrita - milk, curds, ghee, honey, sugar) is done. This yantra requires a sankalpa (commandment) that  " I am doing on behalf of so and so for that particular purpose on this day". You should mention name (for whom the yantra is required), father's name, gotra (family name), star and purpose for which the yantra is required in the sankalpa.

Janakarshana Yantra: Janakarshana Yantra is not intended to attract a particular person into partnership or marriage. This yantra gives  attraction and charisma in public life. The purpose of this yantra is to get recognition and turnover in business. It is  believed that Shri Sankara Bhagawatpada installed Janakarshana Yantra at Srirangam, Dhanakarshana Yantra at Tirupati.  My grand father, Sri Nrusimha Murthi Jois  used to worship this yantra on Sundays before dispensing to his clients.  He used to recite ravi beeja mantra 108 times and use ravi avahana mantra to invoke this yantra.

Santana Gopala Yantra: Santana Gopala Yantra  is very useful for getting a child and a safe progeny. This yantra also prevents miscarriages.   The presiding deity of this yantra is Sri Krishna. The worship of this yantra should start on Thursday. The mantra ("OM DEVAKISUTA GOVINDA VASUDEVA JAGATPATE; DEHIME TANAYAM KRUSHNA TWAMAHAM SHARANAM GATAHA") is to be chanted on Thursday morning at sunrise minimum 18 times.  There are specific mantras for invoking the deity of the yantras. After,  this  shodhasha pooja (sixteen varieties of pooja) with abhisheka (bathing with panchamrita - milk, curds, ghee, honey, sugar) is done. This yantra requires a sankalpa (commandment) that  " I am doing on behalf of so and so for that particular purpose on this day". You should mention name (for whom the yantra is required), father's name, gotra (family name), star and purpose for which the yantra is required in the sankalpa.

Saraswati Yantra : Saraswati yantra is used for attaining knowledge, success in education, literary skills and for good oratory.  Goddess Saraswati is the presiding deity of this yantra. By constant worship of this yantra one becomes learned, famous and earns admiration from all.  The worship of this yantra may start  any day. The mantra  ("OM PRANO DEVI SARASWATHI VAJEBHIRVAJINEEVATI DHINAMAVRITYAVATU") is to be chanted in the morning at sunrise minimum 18 times. 

There are specific mantras for invoking the deity of the yantras. After,  this  shodhasha pooja (sixteen varieties of pooja) with abhisheka (bathing with panchamrita - milk, curds, ghee, honey, sugar) is done. This yantra requires a sankalpa (commandment) that  " I am doing on behalf of so and so for that particular purpose on this day". You should mention name (for whom the yantra is required), father's name, gotra (family name), star and purpose for which the yantra is required in the sankalpa.