Comments on: Power supply with IC regulator 7805,7806,7809,7810,7812 http://www.free-circuit.com/power-supply-with-ic-regulator-78057806780978107812/ Circuit diagram for Power supply,Battery Charger,Power amplifier,Inverter,Converter Mon, 23 Jan 2012 06:07:55 -0700 http://wordpress.org/?v=2.8 hourly 1 By: ibrahim http://www.free-circuit.com/power-supply-with-ic-regulator-78057806780978107812/comment-page-1/#comment-1688 ibrahim Tue, 01 Nov 2011 14:57:32 +0000 http://www.free-circuit.com/?p=117#comment-1688 do not wory about the transformer voltage. Input voltage of 7805 vould be 10-40V peak. therefore just increase the value of the resistor between the rectifier diodes and 7805 in only. your output does not follow input voltage. It stays at 5Vdc. More important point that electrolitic capacitor voltages should be at least equal to minimum 1.41*Supply voltage. do not wory about the transformer voltage. Input voltage of 7805 vould be 10-40V peak. therefore just increase the value of the resistor between the rectifier diodes and 7805 in only. your output does not follow input voltage. It stays at 5Vdc. More important point that electrolitic capacitor voltages should be at least equal to minimum 1.41*Supply voltage.

]]> By: Pallavi http://www.free-circuit.com/power-supply-with-ic-regulator-78057806780978107812/comment-page-1/#comment-1647 Pallavi Fri, 07 Oct 2011 15:23:55 +0000 http://www.free-circuit.com/?p=117#comment-1647 we had to make 5 volt DC power supply as a college project,and in that we had to use IC 7805 along with a centre tap transformer of o/p voltage as 5 volt (5-0-5) . But due to "practical problems" now we have 9 volt centre tap transformer! can we use the same IC? (7805) and get same output? or should we use IC 7809? BUT then the o/p would be 9 volt right? we had to make 5 volt DC power supply as a college project,and in that we had to use IC 7805 along with a centre tap transformer of o/p voltage as 5 volt (5-0-5) . But due to “practical problems” now we have 9 volt centre tap transformer! can we use the same IC? (7805) and get same output? or should we use IC 7809? BUT then the o/p would be 9 volt right?

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