{"product_id":"lm7815-voltage-regulator","title":"Lm7905 Negative Voltage Regulator","description":"\u003cdiv class=\"electro-description\" style=\"margin-bottom:2em;color:rgb(104,108,111);font-family:'Open Sans', 'HelveticaNeue-Light', 'Helvetica Neue Light', 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif;letter-spacing:-.14px;background-color:rgb(255,255,255);\"\u003e\r\n\u003cp style=\"margin-top:0px;margin-bottom:2.857em;\"\u003e\u003cimg alt=\"Image result for voltage regulator 7812 pinout\" height=\"195\" src=\"https:\/\/digilog.pk\/cdn\/shop\/files\/7805-pinout.jpg\" width=\"275\" data-original=\"http:\/\/gadgetronicx.com\/wp-content\/uploads\/2014\/03\/7805-pinout.jpg\" loading=\"lazy\" data-files=\"7805-pinout.jpg\"\u003e\u003c\/p\u003e\r\n\r\n\u003cp style=\"margin-top:0px;margin-bottom:2.857em;\"\u003eWe all very well know regarding the building procedures a DC power supply circuit using a transformer, a bridge rectifier and a filter capacitor.\u003cbr\u003e\r\n\u003cbr\u003e\r\nIt just requires connecting four diodes in a bridge configuration and connect it to the secondary of the transformer, the capacitor goes to the output of the bridge terminals.\u003cbr\u003e\r\nThe output produced across the capacitor is approximately equal to the rated voltage of the transformer, rather a few volts higher than the transformer spec.\u003cbr\u003e\r\nHowever the voltage obtained from the above simple configuration is never regulated and stabilized, meaning the output from it will never be constant and will vary with the varying input mains voltage levels, which we know is never constant.\u003cbr\u003e\r\nA varying voltage can cause drastic consequences to a sensitive electronic circuit, for example a TTL, LS and HC series of ICs cannot tolerate more than 5 volts and can get immediately damaged.\u003cbr\u003e\r\nA CMOS IC cannot stand more than 16 to 18 volts.\u003cbr\u003e\r\nA relay if operated at voltages more than its rating can become hot and waste electricity unnecessarily.\u003cbr\u003e\r\nThere are several other issues which might be faced with electronic circuits if the applied is an unregulated one.\u003cbr\u003e\r\nFor solving the above issue, many high grade yet very simple to configure chips have been designed and are available cheaply and plentifully in our electronic markets.\u003cbr\u003e\r\nThe 78XX voltage regulator series for example, comes with most of the standard voltage ratings which can be used in conjunction with an ordinary power supply DC for obtaining high grade, clean voltage controlled outputs.\u003c\/p\u003e\r\n\r\n\u003cp style=\"margin-top:0px;margin-bottom:2.857em;\"\u003eThe specifications of the 78XX series IC can be understood with the following points:\u003c\/p\u003e\r\n\r\n\u003cp style=\"margin-top:0px;margin-bottom:2.857em;\"\u003eOutput voltage tolerances are around 2% at Tj\u003cbr\u003e\r\n= 25 C and 4%\u003cbr\u003e\r\nLine regulation is around 0.01% of VOUT\/V of VIN at 1A load\u003cbr\u003e\r\nInternal circuitry is thermal and overload protected\u003cbr\u003e\r\nInternal short-circuit current limit protections are also included\u003cbr\u003e\r\nOutput transistor safe area protection is also one of the features of these ICs\u003c\/p\u003e\r\n\r\n\u003cp style=\"margin-top:0px;margin-bottom:2.857em;\"\u003eThe entire range of these ICs are given in the following table:\u003c\/p\u003e\r\n\r\n\u003cdiv class=\"separator\"\u003e\u003ca href=\"http:\/\/1.bp.blogspot.com\/-a9sHaofKJAQ\/T21TTw-rYyI\/AAAAAAAAA8Y\/yR1HWdDdKDs\/s1600\/78XX%20voltage%20regulator%20range%20of%20ICs.jpg\"\u003e\u003cimg alt=\"Lm7905 Negative Voltage Regulator\" border=\"0\" height=\"319\" src=\"https:\/\/digilog.pk\/cdn\/shop\/files\/78XX20voltage20regulator20range20of20ICs.jpg\" width=\"320\" data-original=\"\/\/1.bp.blogspot.com\/-a9sHaofKJAQ\/T21TTw-rYyI\/AAAAAAAAA8Y\/yR1HWdDdKDs\/s320\/78XX%20voltage%20regulator%20range%20of%20ICs.jpg\" loading=\"lazy\" data-files=\"78XX20voltage20regulator20range20of20ICs.jpg\"\u003e\u003c\/a\u003e\u003c\/div\u003e\r\n\r\n\u003cp style=\"margin-top:0px;margin-bottom:2.857em;\"\u003eHow a 7805\/7812\/7815\/7824 ICs are used or connected in electronic circuits.\u003c\/p\u003e\r\n\r\n\u003cp style=\"margin-top:0px;margin-bottom:2.857em;\"\u003eA classic example can be seen \u003ca href=\"https:\/\/homemadecircuitsandschematics.blogspot.com\/2012\/03\/how-to-make-simple-dc-to-dc-cell-phone.html\" target=\"_blank\" rel=\"noopener\" title=\"In this article\"\u003ein this article\u003c\/a\u003e where a 7805 IC is used as a cell phone charger regulator.\u003c\/p\u003e\r\n\r\n\u003cp style=\"margin-top:0px;margin-bottom:2.857em;\"\u003eRefer circuit diagram\u003c\/p\u003e\r\n\r\n\u003cul\u003e\r\n\t\u003cli\u003eThese ICs have just three leads, making it very easy to understand and connect. The leads are assigned as input, ground and output respectively.\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\r\n\u003cul\u003e\r\n\t\u003cli\u003eKeeping the printed side toward you, the left side lead is the input, the center one is the ground and the right side lead is the output.\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\r\n\u003cul\u003e\r\n\t\u003cli\u003eThe DC from any standard power supply is applied across the input and the ground leads of the IC, the positive goes to the input while the negative is connected to the ground.\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\r\n\u003cdiv\u003e \u003c\/div\u003e\r\n\r\n\u003cul\u003e\r\n\t\u003cli\u003eThe output is acquired across the output and the ground pins of the IC, the positive being received from the “output” pin and the negative from the common ground line.\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\r\n\u003cp style=\"margin-top:0px;margin-bottom:0px;\"\u003eMany example application circuits and connection details can be found in this \u003ca href=\"https:\/\/www.ti.com\/product-category\/power-management\/overview.html\" target=\"_blank\" rel=\"noopener noreferrer\" title=\"Power management | ti.com\" aria-label=\"Visit a webpage about Power management | ti.com\"\u003eARTICLE\u003c\/a\u003e\u003c\/p\u003e\r\n\u003c\/div\u003e","brand":"China","offers":[{"title":"Default Title","offer_id":43962394574913,"sku":"B61,L10,Th5","price":45.0,"currency_code":"PKR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0727\/2805\/1777\/files\/LM7905.jpg?v=1779580025","url":"https:\/\/stem.pk\/products\/lm7815-voltage-regulator","provider":"stem.pk","version":"1.0","type":"link"}