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Suresh R
02/11/06 04:41
Read: 1819 times

#109776 - 3A constant current source
Hello Everyone,

The link below shows a 3A constant current source circuit

The circuit is intended to give (0 to 3)A current (with ripples less than 30mV) by tuning the potentiometer(R17)

In the LM338 regulator part i would like to know the following:

What could be the function of BC557 transistor(along with cap c9,c10)in the regulator circuit.

In the Transistor driver circuit,
I would like to know the following:

1)Use of R12 resistor. Is it necessary?
2)What is the effect of the opamp output (at pin 1) due to the use of the 1K(R1) feedback. Kindly tell me how the current and voltage varies at the pin 1 due to the this 1K feed back .


List of 21 messages in thread
3A constant current source      Suresh R      02/11/06 04:41      
   Where did you find it?      Andy Neil      02/11/06 05:56      
   Ripple      Andy Neil      02/11/06 06:00      
      plating purpose      Suresh R      02/11/06 09:45      
         I got it from a person known to me      Andy Neil      02/11/06 15:04      
            replies      Suresh R      02/12/06 09:24      
               plating circuit      Terry Lingle      02/12/06 11:40      
                  Compliance of source      Steve M. Taylor      02/12/06 13:51      
                     yes      Terry Lingle      02/12/06 16:21      
         Think about that      Neil Kurzman      02/11/06 16:08      
   Component Purposes      Bruce Bailey      02/11/06 12:58      
   This circuit will never work!      Kai Klaas      02/11/06 19:46      
      Could it be?      Neil Kurzman      02/11/06 23:55      
         Function      Kai Klaas      02/12/06 20:08      
            issues      Suresh R      02/13/06 02:42      
                plating quality control.      Terry Lingle      02/13/06 07:29      
               Answers      Kai Klaas      02/13/06 11:36      
                  followups      Suresh R      02/14/06 02:20      
                     Answers II      Kai Klaas      02/14/06 07:01      
                        followups & Back EMF's?      Suresh R      02/15/06 03:59      
                           Floating regulator      Kai Klaas      02/15/06 09:27      

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