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Forum Index : Electronics : lm338 circuit voltage drop

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Warpspeed
Guru

Joined: 09/08/2007
Location: Australia
Posts: 4406
Posted: 06:02pm 12 Sep 2018
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Always best to read right through the application notes for the particular chip.

There are many of these three terminal regulators out there, and the internal circuitry does vary. Pay special attention to any capacitor requirements, some regulators will oscillate fairly readily if the input is not bypassed.

Protection diodes are also recommended if the output voltage can ever exceed the input voltage, which it sometimes can if there are very large capacitors on the output, or inductive loads such as motors.
Cheers,  Tony.
 
irishron40
Senior Member

Joined: 22/09/2014
Location: Ireland
Posts: 254
Posted: 10:52pm 14 Sep 2018
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after so many frustrating times it was indeed cheap chinese transistor problem

Got some good ones from littlediodes in the uk

working all perfect now.

thanks everyone.
 
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