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Old 6th November 2006, 01:03 AM   #11
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Default three terminal regulator ( 78/79 series )

Hi, Guys

With my experience in 78/79 series regulator, it is better to parallel a .1uf cap. with the input & output filter cap.

If in the cct like split supply say + & - dc out in cascade, a diode like 1n4004 shunted in the output side, thus protects the +ve side voltage flows to the -ve side and vise vera. therefore U should put two diode in both + & - side with reverse polarity direction. that means the the diode is not in the dc shorting direction.

another way is to give a load like 10 ma to both + & - output, It makes the regulator more stable. the best way is to connect 2 leds with 2 resistors to limit the current flow thru the leds. usually led draws about 10 ma current.

hope the above method can give u a Help.

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